Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Series

Hydrology

Institution
Keyword
Publication Year
Publication
File Type

Articles 1 - 30 of 763

Full-Text Articles in Life Sciences

Desktop Review Of Groundwater Prospectivity For Irrigation In The Lower De Grey River Area, Don L. Bennett, John A. Simons Mar 2021

Desktop Review Of Groundwater Prospectivity For Irrigation In The Lower De Grey River Area, Don L. Bennett, John A. Simons

Resource management technical reports

The Department of Primary Industries and Regional Development (DPIRD) has identified priority areas in the Pilbara that warrant further investigation into their capacity for irrigated agriculture and related businesses. The De Grey River area is one of these.

The lower De Grey River area, upstream of the De Grey River Water Reserve, was identified by the Transforming Agriculture in the Pilbara (TAP) project for staged investigations of viability. Progression through these stages, each with increasingly detailed groundwater and soil suitability investigations, is dependent on prospectivity.

This document provides a summary of DPIRD’s initial desktop groundwater evaluation in the lower ...


Supporting Data - Recycling Of Nitrate And Organic Matter By Plants In The Vadose Zone Of A Saturated Riparian Buffer, Patience Bosompemaa, Eric Wade Peterson, William Perry, Wondwosen M. Seyoum Jan 2021

Supporting Data - Recycling Of Nitrate And Organic Matter By Plants In The Vadose Zone Of A Saturated Riparian Buffer, Patience Bosompemaa, Eric Wade Peterson, William Perry, Wondwosen M. Seyoum

Faculty Publications-- Geography, Geology, and the Environment

Data from the analysis of nitrate as nitrogen in the soil and soil pore water within the vadose zone of a saturated riparian buffer (SRB). Additional properties measured include: Organic matter (as %), bulk density, moisture content, and porosity. Soil samples were collected pre-growing season (n=57) and post-growing season from two plots (n=29): vegetated plots and barren plots. Statistical comparison of among the treatments, Pre-growing season, plot with plants, and barren plot, and among the different depths, 30 cm, 60 cm, and 90 cm identified significantly different soil NO3--N concentrations. Plots with plants experienced a reduction in ...


Assessment Of Input Parameters And Calibration Methods For Simulating Prairie Pothole Hydrology Using Annagnps, Brady A. Nahkala, Amy L. Kaleita, Michelle L. Soupir Jan 2021

Assessment Of Input Parameters And Calibration Methods For Simulating Prairie Pothole Hydrology Using Annagnps, Brady A. Nahkala, Amy L. Kaleita, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

The Annualized Agricultural Non-Point Source (AnnAGNPS) model was used to predict water volume in individual prairie potholes within the Des Moines Lobe of Iowa. AnnAGNPS can represent prairie potholes as static wetland areas located on preferential flow paths at field scale, whereas standard practice of watershed modeling is to fill depressions while preparing input data, and whereas models have lumped parameters at scales too large for individual pothole representation, or are considered too complex for widespread implementation. Here, we assess how key user inputs affect hydrologic calibration of 6 AnnAGNPS prairie pothole models, suggest methods for calibrating and modeling the ...


Impacts Of Forest Management And Timber Harvest Practices On Karst Critical Zone Processes In Tongass National Forest, Alaska, Anna Gwendolyn Harris Oct 2020

Impacts Of Forest Management And Timber Harvest Practices On Karst Critical Zone Processes In Tongass National Forest, Alaska, Anna Gwendolyn Harris

Masters Theses & Specialist Projects

This study characterizes the throughfall, hydrogeochemistry, dissolution rates, and carbon sources of two proximate temperate rainforest cave systems within the Tongass National Forest in Southeast Alaska (Tongass). Study sites include: an old-growth forest, characterized by having never been logged (containing Walkabout Cave system); and a previously logged – within thirty years, second-growth forest (containing Zina Cave system). Precipitation data were recorded over a five-month period at 10-minute intervals, to understand the effects of throughfall between the altering old and second-growth canopies. At each major spring for the two cave systems, high-resolution data were collected from June 29 through November 21, 2019 ...


Statement Of World Aquatic Scientific Societies On The Need To Take Urgent Action Against Human-Caused Climate Change, Based On Scientific Evidence [Dear Colleague Letter], Scott A. Bonar, Brian R. Murphy, Leanne H. Roulson, Jesse T. Trushenski, Douglas J. Austen, Michael Edward Douglas Jul 2020

Statement Of World Aquatic Scientific Societies On The Need To Take Urgent Action Against Human-Caused Climate Change, Based On Scientific Evidence [Dear Colleague Letter], Scott A. Bonar, Brian R. Murphy, Leanne H. Roulson, Jesse T. Trushenski, Douglas J. Austen, Michael Edward Douglas

US Fish & Wildlife Publications

Dear Colleague Letter from the American Fisheries Society to fellow scientific societies, July 25, 2020, about the urgent need for responsive collective action to mitigate impending radical climate change. Includes the Statement of World Aquatic Scientific Societies on the Need to Take Urgent Action Against Human-Caused Climate Change, Based on Scientific Evidence, emphasizing the importance of aquatic ecosystems. Includes extensive citations and notes.

"Water is the most important natural resource on Earth as it is vital for life. Aquatic ecosystems, freshwater or marine, provide multiple benefits to human society, such as provisioning of oxygen, food, drinking water, genetic resources; regulation ...


In‐Situ Probe Spacing Calibration Improves The Heat Pulse Method For Measuring Soil Heat Capacity And Water Content, Meng Zhang, Yili Lu, Tusheng Ren, Robert Horton Jul 2020

In‐Situ Probe Spacing Calibration Improves The Heat Pulse Method For Measuring Soil Heat Capacity And Water Content, Meng Zhang, Yili Lu, Tusheng Ren, Robert Horton

Agronomy Publications

Heat pulse (HP) sensors have been used extensively to measure soil thermal properties and volumetric water content (θ) simultaneously. Probe spacing (R), the distance between heater probe and temperature probe, is routinely calibrated in agar solution before making HP measurements. In reality, R may change due to probe deflection at insertion into soil, causing uncertainties in HP measured volumetric heat capacity (C) and θ. In this paper, we present a simple on-site calibration method for determining in-situ R by using theoretical C values estimated from soil bulk density and θ values of intact soil cores collected near the sensor locations ...


Are Visible Fractures Accurate Predictors Of Flow And Mass Transport In Fractured Till?, Nathan L. Young, William W. Simpkins, Robert Horton May 2020

Are Visible Fractures Accurate Predictors Of Flow And Mass Transport In Fractured Till?, Nathan L. Young, William W. Simpkins, Robert Horton

Agronomy Publications

Tracer experiments conducted in the laboratory on undisturbed core samples (<7.3-cmdiameter) have been a standard method for estimating hydraulic and transport properties of fractured till since the 1980s. This study assesses the relationship between visible fractures on the top and bottom of core samples and the resulting hydraulic and mass transport properties of the core. We hypothesized that more visible fractures would indicate the presence of a wellconnected fracture network, leading to greater hydraulic conductivity (K) values and earlier chemical breakthrough times. To test this hypothesis, water flow and bromide (Br-) tracer experiments were performed on ten, 16-cm diameter, 16-cm-tall samples of fractured Dows Formation till from central Iowa. Visually identifiable fractures were present on the top and bottom of every sample. Results indicate that the visual identification of fractures does not predict a connected fracture network, as some samples produced breakthrough curves showing rapid first arrival times and shapes characteristic of solute transport in a fractured medium, while others appeared similar to an unfractured medium. No correlation was found between the number of visible fractures and K (Pearson’s r = 0.25), or Br- first arrival time (r = -0.33), but a strong negative correlation between K and first arrival time (r = -0.92). Results indicate that the sample volume was not large enough to reliably contain a connected fracture network. Thus, testing large volumes of till at the field scale coupled with fracture-flow modeling likely represents the best approach for estimating hydraulic and mass transport properties for fractured till.


Year Long Water Quality Analysis Of White Horn Brook, Kevin Dyer May 2020

Year Long Water Quality Analysis Of White Horn Brook, Kevin Dyer

Senior Honors Projects

KEVIN DYER (Marine Biology)

Year-long Analysis of the Water Quality of White Horn Brook

Sponsor: Thomas Boving (Geological Sciences)

Water is the foundation for all life on earth and is the most vital resource on this planet. Despite this, oceans and waterways all over the world are being polluted and exploited in ways detrimental to their fundamental hydrologic functions. For instance, excess nitrate levels can lead to eutrophication which gives rise to harmful algae blooms. Low pH can cause the breakdown of CaCO3 exoskeletons of organisms, such mollusks. High temperature variations are major stressors to living things and can cause ...


Impact Of Agricultural Land Use On Stream Nitrate, Phosphorus, And Sediment Concentrations At The Watershed And Field Scale, Brittany A. Kirsch May 2020

Impact Of Agricultural Land Use On Stream Nitrate, Phosphorus, And Sediment Concentrations At The Watershed And Field Scale, Brittany A. Kirsch

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Water quality is directly impacted by the landscape through which it travels. As such, land use, including summer annual and winter annual/perennial agriculture, has dramatic influence on the water quality of downstream aquatic and terrestrial ecosystems. I examined the impact of agricultural land use on water quality through two projects, one at a watershed scale and one at a field scale. In my first project, I investigated the impact of agricultural land use and climate on water quality in 13 HUC10 watersheds across Nebraska using public data from US Geological Survey (USGS), US Department of Agriculture National Agricultural Statistics ...


Changing Water Resources’ Effect On Livelihoods And Socio-Ecological Relationships In Himalayan Communities Of Nepal, Luke Bazemore Apr 2020

Changing Water Resources’ Effect On Livelihoods And Socio-Ecological Relationships In Himalayan Communities Of Nepal, Luke Bazemore

Independent Study Project (ISP) Collection

The looming threat of climate change will lead to significant alterations in livelihoods and daily practices for individuals across the world. This paper seeks to identify the effects of climate change on hydrological regimes in Himalayan communities in Nepal with particular focus towards livelihood and socio-ecological transformations. Using the socio-ecological systems framework to analyze specific communities and their resource use, along with vulnerability and adaptative capacity analysis, this paper includes a meta-analysis of existing literature. Numerous findings indicated that rural, mountainous communities of Nepal face a variety of environmental impacts which may reduce viability of two significant modes of production ...


Influence Of Forest-To-Silvopasture Conversion And Drought On Components Of Evapotranspiration, Adam P. Coble, Alexandra R. Contosta, Richard G. Smith, Nathan W. Siegert, Matthew A. Vadeboncoeur, Katie A. Jennings, Anthony J. Stewart, Heidi Asbjornsen Mar 2020

Influence Of Forest-To-Silvopasture Conversion And Drought On Components Of Evapotranspiration, Adam P. Coble, Alexandra R. Contosta, Richard G. Smith, Nathan W. Siegert, Matthew A. Vadeboncoeur, Katie A. Jennings, Anthony J. Stewart, Heidi Asbjornsen

Natural Resources and the Environment Scholarship

The northeastern U.S. is projected to experience more frequent short-term (1-2 month) droughts interspersed among larger precipitation events. Agroforestry practices such as silvopasture may mitigate these impacts of climate change while maintaining economic benefits of both agricultural and forestry practices. This study evaluated the effects of forest-to-silvopasture (i.e., 50% thinning) conversion on the components of evapotranspiration (transpiration, rainfall interception, and soil evaporation) during the growing season of 2016. The study coincided with a late-summer drought throughout the northeastern U.S., which allowed us to also evaluate the effects of forest-to-silvopasture conversion on drought responses of multiple tree species ...


Hydrogeology Of The Gillingarra Palaeochannel, Russell Speed, Adele Killen Feb 2020

Hydrogeology Of The Gillingarra Palaeochannel, Russell Speed, Adele Killen

Resource management technical reports

Previous groundwater investigations had identified the presence of palaeochannel sediments under the Capitela Valley in the Perth Basin, about 25 kilometres south-west of Moora. The sediments of this Capitela Palaeochannel were thought to form a discrete aquifer of good quality groundwater suitable for agriculture.

To improve our understanding of the Capitela Palaeochannel, its distribution, water quality and potential as a groundwater resource, we undertook an airborne electromagnetic (AEM) geophysical survey of the area in December 2012. This led to the discovery of a palaeochannel located in the Darling Range between Gillingarra and New Norcia, and we named this the Gillingarra ...


2020 Sponsorship Opportunities. Lincoln, Neb., Usa, Oct. 7-9, 2020 Jan 2020

2020 Sponsorship Opportunities. Lincoln, Neb., Usa, Oct. 7-9, 2020

Daugherty Water for Food Global Institute Literature

The Water for Food Global Conference convenes leading international experts and organizations to focus on achieving global water and food security. “Cultivating Innovation: The Next Decade,” will include keynote speakers, sessions, interactive learning and networking opportunities. The conference also celebrates the 10 year anniversary of the Daugherty Water for Food Global Institute, headlining a week of water and food security-related activities.

Topics include: • Research and Technology Innovation • Policy/Management Tools and Best Practices • Capacity Development/Youth and Students • Water Quality and Public Health • Climate Change and Ecosystems • Women for Water and Food • Nutrition and Health • Entrepreneurship


Internet Of Things For Sustainable Forestry, Abdul Salam Jan 2020

Internet Of Things For Sustainable Forestry, Abdul Salam

Faculty Publications

Forests and grasslands play an important role in water and air purification, prevention of the soil erosion, and in provision of habitat to wildlife. Internet of Things has a tremendous potential to play a vital role in the forest ecosystem management and stability. The conservation of species and habitats, timber production, prevention of forest soil degradation, forest fire prediction, mitigation, and control can be attained through forest management using Internet of Things. The use and adoption of IoT in forest ecosystem management is challenging due to many factors. Vast geographical areas and limited resources in terms of budget and equipment ...


Assessing The Hierarchy Of Long-Term Environmental Controls On Diatom Communities Of Yellowstone National Park Using Lacustrine Sediment Records, Victoria Chraibi, Sherilyn C. Fritz Jan 2020

Assessing The Hierarchy Of Long-Term Environmental Controls On Diatom Communities Of Yellowstone National Park Using Lacustrine Sediment Records, Victoria Chraibi, Sherilyn C. Fritz

Papers in the Earth and Atmospheric Sciences

An ecosystem’s ability to maintain structure and function following disturbance, defined as resilience, is influenced by a hierarchy of environmental controls, including climate, surface cover, and ecological relationships that shape biological community composition and productivity. This study examined lacustrine sediment records of naturally fishless lakes in Yellowstone National Park to reconstruct the response of aquatic communities to climate and trophic cascades from fish stocking. Sediment records of diatom algae did not exhibit a distinct response to fish stocking in terms of assemblage or algal productivity. Instead, 3 of 4 lakes underwent a shift to dominance by benthic diatom species ...


The Role Of Warm, Dry Summers And Variation In Snowpack On Phytoplankton Dynamics In Mountain Lakes, Isabella A. Olesky, Whitney S. Beck, Roderick W. Lammers, Cara E. Steger, Codie Wilson, Kyle R. Christianson, Kim Vincent, Gunnar Forrest Johnson, Pieter T.J. Johnson, Jill S. Baron Jan 2020

The Role Of Warm, Dry Summers And Variation In Snowpack On Phytoplankton Dynamics In Mountain Lakes, Isabella A. Olesky, Whitney S. Beck, Roderick W. Lammers, Cara E. Steger, Codie Wilson, Kyle R. Christianson, Kim Vincent, Gunnar Forrest Johnson, Pieter T.J. Johnson, Jill S. Baron

Geology Faculty Publications and Presentations

Climate change is altering biogeochemical, metabolic, and ecological functions in lakes across the globe. Historically, mountain lakes in temperate regions have been unproductive because of brief ice-free seasons, a snowmelt-driven hydrograph, cold temperatures, and steep topography with low vegetation and soil cover. We tested the relative importance of winter and summer weather, watershed characteristics, and water chemistry as drivers of phytoplankton dynamics. Using boosted regression tree models for 28 mountain lakes in Colorado, we examined regional, intraseasonal, and interannual drivers of variability in chlorophyll a as a proxy for lake phytoplankton. Phytoplankton biomass was inversely related to the maximum snow ...


Biomass Production With Conservation Practices For Two Iowa Watersheds, Miae Ha, May Wu, Mark D. Tomer, Philip W. Gassman, Thomas M. Isenhart, Jeffrey G. Arnold, Michael J. White, Esther S. Parish, Kevin S. Comer, Bill Belden Jan 2020

Biomass Production With Conservation Practices For Two Iowa Watersheds, Miae Ha, May Wu, Mark D. Tomer, Philip W. Gassman, Thomas M. Isenhart, Jeffrey G. Arnold, Michael J. White, Esther S. Parish, Kevin S. Comer, Bill Belden

Natural Resource Ecology and Management Publications

Hydrologic modeling was used to estimate potential changes in nutrients, suspended sediment, and streamflow in various biomass production scenarios with conservation practices under different landscape designs. Two major corn and soybean croplands were selected for study: the South Fork of the Iowa River watershed and the headwater of the Raccoon River watershed. A physically based model, the Soil and Water Assessment Tool, was used to simulate hydrology and water quality under different scenarios with conservation practices and biomass production. Scenarios are based on conservation practices and biomass production; riparian buffer (RB), saturated buffer, and grassed waterways; various stover harvest rates ...


Soil Water And Crop Water Use With Crop Rotations And Cultural Practices, Upendra M. Sainju, Andrew W. Lenssen, Brett L. Allen, Jalal D. Jabro, William B. Stevens, William M. Iversen Jan 2020

Soil Water And Crop Water Use With Crop Rotations And Cultural Practices, Upendra M. Sainju, Andrew W. Lenssen, Brett L. Allen, Jalal D. Jabro, William B. Stevens, William M. Iversen

Agronomy Publications

Limited and erratic precipitation in arid and semiarid regions can affect soil water storage, water use, and dryland crop performance. Our objective was to examine soil water content, crop yield, and water‐use efficiency (WUE) with crop rotations and cultural practices for 6 yr in the northern Great Plains. Crop rotations were durum wheat (or durum) (Triticum turgidum L.)−durum−canola (Brassica napus L.)−pea (Pisum sativum L.) (DDCP), durum−durum−flax (Linum usitatissimum L.)−pea (DDFP), durum−canola−durum−pea (DCDP), and durum−flax−durum−pea (DFDP). A continuous durum (CD) was also included for comparison. Cultural practices were ...


Groundwater Chemistry And Salinity Processes In The Myalup Region, Adam M. Lillicrap, Richard J. George Dr Dec 2019

Groundwater Chemistry And Salinity Processes In The Myalup Region, Adam M. Lillicrap, Richard J. George Dr

Resource management technical reports

The Myalup region, which incorporates the Myalup Irrigated Agriculture Precinct (MIAP), is located about 100 kilometres south of Perth between the southern end of Lake Clifton and the northern tip of the Leschenault Inlet. It covers 17 800 hectares, with about 2100ha being irrigated. The precinct produces mainly carrots, onions, potatoes and leafy vegetables. In 2016–17, the total value of agricultural production for the MIAP, including on-farm processing and packaging, was more than $120 million.

Irrigation water is mainly from the surficial Myalup aquifer, with limited abstraction from the underlying Leederville aquifer. Average annual rainfall is about 800 millimetres ...


Groundwater Investigations To Support Irrigated Agriculture At La Grange, Western Australia: 2013–18 Results, Robert J. Paul, Gregory Paul Raper, Richard J. George Dr, Nicholas J. Wright, Adam M. Lillicrap, Peter S. Gardiner Dec 2019

Groundwater Investigations To Support Irrigated Agriculture At La Grange, Western Australia: 2013–18 Results, Robert J. Paul, Gregory Paul Raper, Richard J. George Dr, Nicholas J. Wright, Adam M. Lillicrap, Peter S. Gardiner

Resource management technical reports

The Broome Sandstone aquifer is the main aquifer and groundwater resource in the La Grange area, near Broome in the West Kimberley, Western Australia. Land use is dominated by cattle grazing on pastoral stations, dispersed mining and tourism. Irrigated agriculture has developed at a small scale, with about 470 hectares under cultivation in 2014. Groundwater abstraction is licensed under the La Grange groundwater allocation plan (Department of Water 2010) and managed by the Department of Water and Environmental Regulation. The La Grange groundwater allocation area is split into the La Grange North subarea and La Grange South subarea, with groundwater ...


Vegetation Classification And Mapping, Missouri National Recreational River, Tom Baldvins, Matt Ley, David Jones, Joe Stevens, Hannah Pilkington Dec 2019

Vegetation Classification And Mapping, Missouri National Recreational River, Tom Baldvins, Matt Ley, David Jones, Joe Stevens, Hannah Pilkington

U.S. National Park Service Publications and Papers

Executive Summary

The vegetation inventory project at Missouri National Recreational River (MNRR) classified and mapped vegetation within the park administrative boundary and estimated thematic map accuracy quantitatively. The project was conducted over a four year period from the summer of 2015 to the winter of 2019.

The project follows guidance provided by the National Park Service (NPS) Vegetation Mapping Inventory (VMI) Program. The overall process includes initial planning and scoping, imagery procurement, field data collection, data analysis, imagery interpretation and classification, and accuracy assessment. The initial planning and scoping meetings to support study plan development took place in December, 2009 ...


Sustainable Intensification Of Agricultural Drainage, Michael J. Castellano, Sotirios V. Archontoulis, Matthew J. Helmers, Hanna J. Poffenbarger, Johan Six Oct 2019

Sustainable Intensification Of Agricultural Drainage, Michael J. Castellano, Sotirios V. Archontoulis, Matthew J. Helmers, Hanna J. Poffenbarger, Johan Six

Agronomy Publications

Artificial drainage is among the most widespread land improvements for agriculture. Drainage benefits crop production, but also promotes nutrient losses to water resources. Here, we outline how a systems perspective for sustainable intensification of drainage can mitigate nutrient losses, increase fertilizer nitrogen use efficiency (NUE) and reduce greenhouse gas emissions. There is an immediate opportunity to realize these benefits because agricultural intensification and climate change are increasing the extent and intensity of drainage systems. If a systems-based approach to drainage can consistently increase NUE while maintaining or increasing crop production, farmers and the environment will benefit.


Capacity And Distribution Of Water Stored In The Vadose Zone Of The Chinese Loess Plateau, Yuanjun Zhu, Xiaoxu Jia, Jiangbo Qiao, Andrew Binley, Robert Horton, Wei Hu, Yunqiang Wang, Ming’An Shao Oct 2019

Capacity And Distribution Of Water Stored In The Vadose Zone Of The Chinese Loess Plateau, Yuanjun Zhu, Xiaoxu Jia, Jiangbo Qiao, Andrew Binley, Robert Horton, Wei Hu, Yunqiang Wang, Ming’An Shao

Agronomy Publications

Water stored in the vadose (unsaturated) zone provides the majority of water required by plants and buffers water resources; thus, it is central to understanding ecological and hydrological processes in the Chinese Loess Plateau (CLP) with its thick loess deposits. We used multisource data on soil water content (SWC) and vadose zone thickness, combined with a spatial interpolation method, to quantify the vadose zone water and further deduce the water resource composition in the CLP. Vadose zone water is approximately 3.1 × 1012 m3 (±27.5%) in the CLP, 92.4% of which is stored in the deep ...


Student Support Program Outputs, Outcomes And Impacts Report Oct 2019

Student Support Program Outputs, Outcomes And Impacts Report

Daugherty Water for Food Global Institute Literature

The Robert B. Daugherty Water for Food Global Institute (DWFI) inititated its Postdoctoral and Student Support Programs in 2014. The following details their achievements.

Round One -- The institute first provided undergraduate, graduate student and postdoctoral support to faculty who were selected following a call for proposals in 2014. Support was awarded for two postdocs, five graduate students, and two projects with undergraduate students. By FY19 a small amount of support continues for Francisco Munoz-Arriola’s program. Outputs include presentations, grants and publications. The other faculty who have received support are: Vijendra Boken, UNK Geography & Earth Science; Carrick Detweiler, UNL Computer Science & Engineering; Trenton ...


The Relationship Between Forest Management And Stream Discharge In Mazumbai And Baga Ii Forest Reserves, Tanga Region, Tanzania, Shannon Duffy Oct 2019

The Relationship Between Forest Management And Stream Discharge In Mazumbai And Baga Ii Forest Reserves, Tanga Region, Tanzania, Shannon Duffy

Independent Study Project (ISP) Collection

Deforestation is known to alter hydrology by reducing interception, transpiration and infiltration capacity, and increasing runoff which all leads to higher stream discharge. For rural Tanzanian communities, surface water resources are crucial for meeting basic needs, so the integrity of headwater catchments need to be maintained to ensure their reliability. The objectives of this study were to a) map the streams in the two forests because none currently exist and b) determine the effect of deforestation on discharge variability. Over fifteen days of data collection, this study analyzed variability of discharge and the degree of correlation between discharge and rainfall ...


Climatic Controls On Peatland Black Spruce Growth In Relation To Water Table Variation And Precipitation, S. F. Dymond, A. W. D'Amato, R. K. Kolka, P. V. Bolstad, S. D. Sebestyen, K. Gill, M. T. Curzon Oct 2019

Climatic Controls On Peatland Black Spruce Growth In Relation To Water Table Variation And Precipitation, S. F. Dymond, A. W. D'Amato, R. K. Kolka, P. V. Bolstad, S. D. Sebestyen, K. Gill, M. T. Curzon

Natural Resource Ecology and Management Publications

Prior research has demonstrated the importance of water limitations and increasing temperatures on upland black spruce (Picea mariana [Mill.] B.S.P.) tree growth, which is a dominant component of the North American boreal forest. However, little work has been done to investigate the connectivity between growth and hydro‐climate in peatland black spruce systems. The boreal forest is the largest global terrestrial biome and is highly threatened due to current and projected increases in temperatures for the northern latitudes. Here we explore the dynamics among annual black spruce growth, climate, and water table elevations using 45 years of in ...


Cryptic Footprints Of Rare Earth Elements On Natural Resources And Living Organisms, Muhammad Adeel, Jie Yinn Lee, Muhammad Zain, Muhammad Rizwan, Aamir Nawab, M. A. Ahmad, Muhammad Shafiq, Hao Yi, Ghulam Jilani, Rabia Javed, Robert Horton, Yukui Rui, Daniel C. W. Tsang, Baoshan Xing Jun 2019

Cryptic Footprints Of Rare Earth Elements On Natural Resources And Living Organisms, Muhammad Adeel, Jie Yinn Lee, Muhammad Zain, Muhammad Rizwan, Aamir Nawab, M. A. Ahmad, Muhammad Shafiq, Hao Yi, Ghulam Jilani, Rabia Javed, Robert Horton, Yukui Rui, Daniel C. W. Tsang, Baoshan Xing

Agronomy Publications

Background: Rare earth elements (REEs) are gaining attention due to rapid rise of modern industries and technological developments in their usage and residual fingerprinting. Cryptic entry of REEs in the natural resources and environment is significant; therefore, life on earth is prone to their nasty effects. Scientific sectors have expressed concerns over the entry of REEs into food chains, which ultimately influences their intake and metabolism in the living organisms.

Objectives: Extensive scientific collections and intensive look in to the latest explorations agglomerated in this document aim to depict the distribution of REEs in soil, sediments, surface waters and groundwater ...


Assessment Of Agricultural Drought Considering The Hydrological Cycle And Crop Phenology In The Korean Peninsula, Chul-Hee Lim, Seung Hee Kim, Jong Ahn Chun, Menas Kafatos, Woo-Kyun Lee May 2019

Assessment Of Agricultural Drought Considering The Hydrological Cycle And Crop Phenology In The Korean Peninsula, Chul-Hee Lim, Seung Hee Kim, Jong Ahn Chun, Menas Kafatos, Woo-Kyun Lee

Mathematics, Physics, and Computer Science Faculty Articles and Research

Hydrological changes attributable to global warming increase the severity and frequency of droughts, which in turn affect agriculture. Hence, we proposed the Standardized Agricultural Drought Index (SADI), which is a new drought index specialized for agriculture and crops, and evaluated current and expected droughts in the Korean Peninsula. The SADI applies crop phenology to the hydrological cycle, which is a basic element that assesses drought. The SADI of rice and maize was calculated using representative hydrological variables (precipitation, evapotranspiration, and runoff) of the crop growing season. In order to evaluate the effectiveness of SADI, the three-month Standardized Precipitation Index, which ...


Analysis Of Permaculture’S Water Conservation And Crop Supporting Abilities, Hannah Chaney May 2019

Analysis Of Permaculture’S Water Conservation And Crop Supporting Abilities, Hannah Chaney

Mahurin Honors College Capstone Experience/Thesis Projects

In the Middle East, virtually all agriculturally viable land is under high threat of desertification due to poor land and resource management and climate change. Mulching using straw flakes (straw mulch permaculture) is a method commonly used in successful dry land permaculture projects in the Middle East. We proposed that straw mulch permaculture would increase the amount of soil moisture during dry periods and that this method would not impact the growth and survival of the crop. In order to test this hypothesis, we took soil samples from plots with and without straw mulch permaculture in Bowling Green, KY and ...


Enhancing Apsim To Simulate Excessive Moisture Effects On Root Growth, Elnaz Ebrahimi-Mollabashi, Neil I. Huth, Dean P. Holzwoth, Raziel A. Ordonez, Jerry L. Hatfield, Isaiah Huber, Michael J. Castellano, Sotirios V. Archontoulis Apr 2019

Enhancing Apsim To Simulate Excessive Moisture Effects On Root Growth, Elnaz Ebrahimi-Mollabashi, Neil I. Huth, Dean P. Holzwoth, Raziel A. Ordonez, Jerry L. Hatfield, Isaiah Huber, Michael J. Castellano, Sotirios V. Archontoulis

Agronomy Publications

Shallow water table (WT) influences crop growth and production in many major agricultural regions across the globe. We enhanced the APSIM-soybean model to accurately simulate root depth in fields with shallow water tables. We used data from a controlled experiment (Rhizotron facilities) that included root depth observations for nine WT treatments to develop and calibrate the new model. Analysis indicated that unconstrained root growth occurs until volumetric soil moisture approaches 0.03 mm/mm below saturation. Below that threshold, root growth linearly decreases to zero at saturation. Inclusion of this factor into the model increased accuracy of root depth simulations ...