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Articles 151 - 180 of 463

Full-Text Articles in Life Sciences

Heterologous Expression Of Secreted Bacterial Bpp And Hap Phytases In Plants Stimulates Arabidopsis Thaliana Growth On Phytate., Lia R. Valeeva, Chuluuntsetseg Nyamsuren, Margarita R. Sharipova, Eugene V. Shakirov Oct 2019

Heterologous Expression Of Secreted Bacterial Bpp And Hap Phytases In Plants Stimulates Arabidopsis Thaliana Growth On Phytate., Lia R. Valeeva, Chuluuntsetseg Nyamsuren, Margarita R. Sharipova, Eugene V. Shakirov

Yevgeniy (Eugene) Shakirov

Phytases are specialized phosphatases capable of releasing inorganic phosphate from myo-inositol hexakisphosphate (phytate), which is highly abundant in many soils. As inorganic phosphorus reserves decrease over time in many agricultural soils, genetic manipulation of plants to enable secretion of potent phytases into the rhizosphere has been proposed as a promising approach to improve plant phosphorus nutrition. Several families of biotechnologically important phytases have been discovered and characterized, but little data are available on which phytase families can offer the most benefits toward improving plant phosphorus intake. We have developed transgenic Arabidopsis thaliana plants expressing bacterial phytases PaPhyC (HAP family …

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Effect Of Intradialytic Exercise On Hyperphosphatemia And Malnutrition, Nada Salhab, Mona Alrukhaimi, Jeroen Kooman, Enrico Fiaccadori, Harith Aljubori, Rana Rizk, Mirey Karavetian Oct 2019

Effect Of Intradialytic Exercise On Hyperphosphatemia And Malnutrition, Nada Salhab, Mona Alrukhaimi, Jeroen Kooman, Enrico Fiaccadori, Harith Aljubori, Rana Rizk, Mirey Karavetian

All Works

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. Intradialytic exercise (IDE) is not routinely prescribed in hemodialysis (HD) units despite its potential benefits on patients’ outcomes. This study was the first in the United Arab Emirates to examine the effect of aerobic IDE on hyperphosphatemia, malnutrition, and other health outcomes among HD patients. Participants were chosen from the largest HD unit in Sharjah Emirate for a quasi-experimental intervention with pre and post evaluation. The study lasted for 12 months. Study parameters were collected at baseline, post intervention, and follow-up. The intervention included a moderate-intensity aerobic IDE of 45 min …

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Climate Change Accelerates Recovery Of The Tatra Mountain Lakes From Acidification And Increases Their Nutrient And Chlorophyll A Concentrations, Jiří Kopáček, Jiří Kaňa, Svetlana Bičárová, Janice Brahney, Tomáš Navrátil, Stephen A. Norton, Petr Porcal, Evžen Stuchlik Sep 2019

Climate Change Accelerates Recovery Of The Tatra Mountain Lakes From Acidification And Increases Their Nutrient And Chlorophyll A Concentrations, Jiří Kopáček, Jiří Kaňa, Svetlana Bičárová, Janice Brahney, Tomáš Navrátil, Stephen A. Norton, Petr Porcal, Evžen Stuchlik

Watershed Sciences Faculty Publications

We evaluated changes in the concentration of cations, anions, nutrients (dissolved organic carbon, DOC; phosphorus, P; and nitrogen forms including nitrate, NO3− and total organic nitrogen, TON), and chlorophyll a (Chl-a) in 31 Tatra Mountain lakes in Slovakia and Poland during their recovery from acidic deposition (1992–2018). Typical effects of decreasing acidic deposition on the lakes’ water composition, such as decreasing base cation concentrations, were confounded by climate change and catchment characteristics, including areal proportions of well-developed soils and scree. A climate-related increase in physical erosion provided freshly exposed unweathered granodiorite (the dominant bedrock) to chemical …

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African Biomass Burning Is A Substantial Source Of Phosphorus Deposition To The Amazon, Tropical Atlantic Ocean, And Southern Ocean, Anne E. Barkley, Joseph M. Prospero, Natalie Mahowald, Douglas S. Hamilton, Kimberly J. Popendorf, Amanda M. Oehlert, Ali Pourmand, Alexandre Gatineau, Kathy Panechou-Pulcherie, Patricia Blackwelder, Cassandra J. Gaston Aug 2019

African Biomass Burning Is A Substantial Source Of Phosphorus Deposition To The Amazon, Tropical Atlantic Ocean, And Southern Ocean, Anne E. Barkley, Joseph M. Prospero, Natalie Mahowald, Douglas S. Hamilton, Kimberly J. Popendorf, Amanda M. Oehlert, Ali Pourmand, Alexandre Gatineau, Kathy Panechou-Pulcherie, Patricia Blackwelder, Cassandra J. Gaston

Marine & Environmental Sciences Faculty Articles

The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can robustly test this hypothesis and even fewer measurements of soluble P, which is readily available for stimulating primary production in the ocean. To test this hypothesis, we measured total and soluble P in long-range transported aerosols collected in Cayenne, French Guiana, a TAO coastal site located at the northeastern edge of the Amazon. …

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Influence Of Varying Inorganic Nutrients Supply On Ergosterol And Glucosamine Concentrations And Biomass Nutrient Stoichiometry In Ectomycorrhizal Fungi, Stephanie S. Koury Aug 2019

Influence Of Varying Inorganic Nutrients Supply On Ergosterol And Glucosamine Concentrations And Biomass Nutrient Stoichiometry In Ectomycorrhizal Fungi, Stephanie S. Koury

Master's Theses

Ectomycorrhizal (ECM) fungi are critical for the health of forest ecosystems where they can sequester large amounts of carbon in the form of soil organic matter, a matter of growing interest due to anthropogenic climate change. A clear understanding of their growth dynamics and responses to environmental changes is imperative for future work in forest management and the possible mitigation of increased atmospheric CO2. Six ECM fungal species were grown in liquid culture under varying nitrogen and phosphorus concentrations and ratios to assess how exogenous nutrient supplies affect fungal biomass stoichiometry and the degree of elemental homeostasis. Additional …

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Effects Of Intradialytic Aerobic Exercise On Hemodialysis Patients: A Systematic Review And Meta-Analysis, Nada Salhab, Mirey Karavetian, Jeroen Kooman, Enrico Fiaccadori, Cosette F. El Khoury Aug 2019

Effects Of Intradialytic Aerobic Exercise On Hemodialysis Patients: A Systematic Review And Meta-Analysis, Nada Salhab, Mirey Karavetian, Jeroen Kooman, Enrico Fiaccadori, Cosette F. El Khoury

All Works

© 2019, The Author(s). Objective: Intradialytic exercise (IDE) is not yet a routine practice for hemodialysis patients, the lack of guidelines supporting it being a major reason. This systematic review and meta-analysis of aerobic IDE interventions examined the efficacy of IDE regarding quality of life (QOL), serum phosphorus, dialysis efficiency, inflammatory status, vitamin D3, parathyroid hormone, intake of phosphate binders, mortality and hospitalization rate. Methods: Pubmed, Medline (Ovid), Embase (Ovid), Cochrane, and Cinahl (EBSCO) databases were searched to retrieve studies up to June 12, 2018. A manual reference search was also performed. Studies were included if they evaluated (a) aerobic …

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Sand And Pumice Filter Amended With Activated Carbon And Biochar For Phosphorus Retention, James Jihoon Kang, Marissa Davila, Sergio Mireles, Jungseok Ho Aug 2019

Sand And Pumice Filter Amended With Activated Carbon And Biochar For Phosphorus Retention, James Jihoon Kang, Marissa Davila, Sergio Mireles, Jungseok Ho

School of Earth, Environmental, and Marine Sciences Faculty Publications and Presentations

Phosphorus (P) loss via stormwater runoff is a water quality concern. The objective of this study was to investigate two commercial biochars relative to an activated carbon as an additive to geomedia (sand and pumice) for P removal. The batch adsorption experiment was conducted to assess P sorption of the geomedia and carbon materials while the leaching experiment was conducted in sand and pumice columns amended with carbon materials (5 % by weight). The batch adsorption test revealed that only activated carbon showed an appreciable P adsorption up to 19 %. Tested biochar materials showed no adsorption capacity for P …

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Structural Response Of Caribbean Dry Forests To Hurricane Winds: A Case Study From Guanica Forest, Puerto Rico, Skip Van Bloem, Ariel E. Lugo, Peter G. Murphy Jul 2019

Structural Response Of Caribbean Dry Forests To Hurricane Winds: A Case Study From Guanica Forest, Puerto Rico, Skip Van Bloem, Ariel E. Lugo, Peter G. Murphy

Skip Van Bloem

Tropical dry forests in the Caribbean have an uniquely short, shrubby structure with a high proportion of multiple-stemmed trees compared to dry forests elsewhere in the Neotropics. Previous studies have shown that this structure can arise without the loss of main stems from cutting, grazing, or other human intervention. The Caribbean has a high frequency of hurricanes, so wind may also influence forest stature. Furthermore, these forests also tend to grow on soils with low amounts of available phosphorus, which may also influence structure. The objective of this study was to assess the role of high winds in structuring dry …

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Effects Of Phosphorus On Benthic Diatom Assemblage Network Structure, Eric M. Massa Jun 2019

Effects Of Phosphorus On Benthic Diatom Assemblage Network Structure, Eric M. Massa

FIU Electronic Theses and Dissertations

Ecological network analysis helps identify how relationships among species differ over time and across sets of species. Microbial assemblages are ideal for evaluating changes in species interactions due to environmental changes because they are speciose and respond at multiple scales. To determine how phosphorus limitation influences diatom network structure, I analyzed relationships among 257 species of diatoms from benthic microbial (periphyton) mats from 10 years of annual samples from 136 sites. Expected evidence of changes in network structure in response to periphyton TP were not found, likely due to species replacement with increased TP. Analysis of species connection distributions and …

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Dynamics Of Measured And Simulated Dissolved Phosphorus In Runoff From Winter-Applied Dairy Manure, Peter A. Vadas, Melanie N. Stock, Francisco J. Arriaga, Laura Ward Good, Krishnapuram G. Karthikeyan, Zachariah P. Zopp Jun 2019

Dynamics Of Measured And Simulated Dissolved Phosphorus In Runoff From Winter-Applied Dairy Manure, Peter A. Vadas, Melanie N. Stock, Francisco J. Arriaga, Laura Ward Good, Krishnapuram G. Karthikeyan, Zachariah P. Zopp

Plants, Soils, and Climate Faculty Publications

Agricultural P loss from fields is an issue due to water quality degradation. Better information is needed on the P loss in runoff from dairy manure applied in winter and the ability to reliably simulate P loss by computer models. We monitored P in runoff during two winters from chisel-tilled and no-till field plots that had liquid dairy manure applied in December or January. Runoff total P was dominated by nondissolved forms when soils were bare and unfrozen. Runoff from snow-covered, frozen soils had much less sediment and sediment-related P, and much more dissolved P. Transport of manure solids was …

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Macronutrient Content Of Winter Annual Cereal Grains With Phosphorus Fertilization, Taylor Anne Young May 2019

Macronutrient Content Of Winter Annual Cereal Grains With Phosphorus Fertilization, Taylor Anne Young

MSU Graduate Theses

Missouri ranks third in the United States in cow-calf production, and much of the land these cattle graze has acidic soil that is low in plant available phosphorus (P). Proper soil fertility is important to ensure that these forages meet the nutritional requirements of cattle. Tall fescue (Festuca arundinaceum (Schreb.)), has been shown to respond to increased soil P levels with increased growth and leaf concentrations of P, calcium (Ca), magnesium (Mg), and potassium (K). It is unknown if winter annual cereals will respond similarly. The objective of this study is to examine cereal rye (Secale cereal L.), winter wheat …

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Plant Community Responses To Stand‐Level Nutrient Fertilization In A Secondary Tropical Dry Forest, Bonnie G. Waring, Daniel Pérez-Aviles, Jessica G. Murray, Jennifer S. Powers Apr 2019

Plant Community Responses To Stand‐Level Nutrient Fertilization In A Secondary Tropical Dry Forest, Bonnie G. Waring, Daniel Pérez-Aviles, Jessica G. Murray, Jennifer S. Powers

Ecology Center Publications

The size of the terrestrial carbon (C) sink is mediated by the availability of nutrients that limit plant growth. However, nutrient controls on primary productivity are poorly understood in the geographically extensive yet understudied tropical dry forest biome. To examine how nutrients influence above‐ and belowground biomass production in a secondary, seasonally dry tropical forest, we conducted a replicated, fully factorial nitrogen (N) and phosphorus (P) fertilization experiment at the stand scale in Guanacaste, Costa Rica. The production of leaves, wood, and fine roots was monitored through time; root colonization by mycorrhizal fungi and the abundance of N‐fixing root nodules …

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Nutrient Limitation Of Phytoplankton In Lake Wateree, South Carolina: Implications For Future Water Quality Management, Kara M. Clyburn Apr 2019

Nutrient Limitation Of Phytoplankton In Lake Wateree, South Carolina: Implications For Future Water Quality Management, Kara M. Clyburn

Theses and Dissertations

Cultural eutrophication is a primary contributor to phytoplankton production in freshwater lakes from excess anthropogenic nutrient inputs, and resulting impacts on water quality, aquatic ecosystems, human and animal health are increasing worldwide. Understanding the factors that limit phytoplankton growth is an important strategy for identifying and managing nutrient sources and successfully controlling the over- enrichment of nitrogen (N) and/or phosphorus (P) in freshwater lakes. The Redfield molecular ratio of carbon (C), N and P maintains that the C:N:P molar ratio is 106:16:1 when nutrients are not limiting, and the ecosystem is balanced. A N:P molar ratio > 20:1 tends to be …

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Biogeochemical Recuperation Of Lowland Tropical Forest During Succession, Benjamin W. Sullivan, Rachel L. Nifong, Megan K. Nasto, Silvia Alvarez-Clare, Camie M. Dencker, Fiona M. Soper, Kevin T. Shoemaker, F. Yoko Ishida, Joana Zaragoza-Castells, Eric A. Davidson, Cory C. Cleveland Feb 2019

Biogeochemical Recuperation Of Lowland Tropical Forest During Succession, Benjamin W. Sullivan, Rachel L. Nifong, Megan K. Nasto, Silvia Alvarez-Clare, Camie M. Dencker, Fiona M. Soper, Kevin T. Shoemaker, F. Yoko Ishida, Joana Zaragoza-Castells, Eric A. Davidson, Cory C. Cleveland

Biology Faculty Publications

High rates of land conversion and land use change have vastly increased the proportion of secondary forest in the lowland tropics relative to mature forest. As secondary forests recover following abandonment, nitrogen (N) and phosphorus (P) must be present in sufficient quantities to sustain high rates of net primary production and to replenish the nutrients lost during land use prior to secondary forest establishment. Biogeochemical theory and results from individual studies suggest that N can recuperate during secondary forest recovery, especially relative to P. Here, we synthesized 23 metrics of N and P in soil and plants from 45 secondary …

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Individual Tree And Stand-Level Carbon And Nutrient Contents Across One Rotation Of Loblolly Pine Plantations On A Reclaimed Surface Mine, Hannah Z. Angel, Jeremy S. Priest, Jeremy P. Stovall, Brian P. Oswald, Hans M. Williams Jan 2019

Individual Tree And Stand-Level Carbon And Nutrient Contents Across One Rotation Of Loblolly Pine Plantations On A Reclaimed Surface Mine, Hannah Z. Angel, Jeremy S. Priest, Jeremy P. Stovall, Brian P. Oswald, Hans M. Williams

Faculty Publications

While reclaimed loblolly pine (Pinus taeda L.) plantations in east Texas, USA have demonstrated similar aboveground productivity levels relative to unmined forests, there is interest in assessing carbon (C) and nutrients in aboveground components of reclaimed trees. Numerous studies have previously documented aboveground biomass, C, and nutrient contents in loblolly pine plantations; however, similar data have not been collected on mined lands. We investigated C, N, P, K, Ca, and Mg aboveground contents for first-rotation loblolly pine growing on reclaimed mined lands in the Gulf Coastal Plain over a 32-year chronosequence and correlated elemental rates to stand age, stem …

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Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Ronald Simpson, Sara Kidd, Samantha Zidd Jan 2019

Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Ronald Simpson, Sara Kidd, Samantha Zidd

Williams Honors College, Honors Research Projects

Harmful Algal Blooms (HABs) are a devastating ecological and economic consequence of the abundance of nutrient-rich agricultural runoff entering aquatic ecosystems (Baker et al. 2014). Bio-available phosphorus from synthetic fertilizers is one of the major nutrients contributing to this global issue. Previous studies indicated that dissolved phosphorus can be removed from an aqueous environment when passed through a composite mixture of granular steel wool particles and activated carbon (Erickson, Gulliver, and Weiss, 2007). In this project, we conducted experiments using higher quality concentration measurements to determine what grades of steel wool (SW-0000, SW-000, SW-00) and types of activated carbon (granulated …

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Global Temporal Patterns In Plant Nutrient Resorption Plasticity, Rebecca E. Drenovsky, Nicole Pietrasiak, Thomas Short Jan 2019

Global Temporal Patterns In Plant Nutrient Resorption Plasticity, Rebecca E. Drenovsky, Nicole Pietrasiak, Thomas Short

2019 Faculty Bibliography

Aim Leaf nutrient resorption is a key nutrient conservation trait, which also influences nutrient cycling rates and pools. Most global biogeochemical models assume that resorption is non‐varying at a temporal scale. However, this trait can differ substantially within populations among years. We assessed the commonality of attaining proficient resorption, the factors associated with proficient resorption, as well as the variability of this trait and the factors controlling trait variability.

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Impact Of A Winter Rye Cover Crop On Edge-Of-Field Nutrient Losses And Corn Silage Production, Keegan Griffith Jan 2019

Impact Of A Winter Rye Cover Crop On Edge-Of-Field Nutrient Losses And Corn Silage Production, Keegan Griffith

Graduate College Dissertations and Theses

Cover crops have the potential to reduce environmental impacts of corn production. The objective of this study was to quantify differences in nitrogen (N) and phosphorus (P) loading between corn plots with or without a winter rye cover crop (Secale cerale). Four field plots (30 x 46 m) in Chazy, NY with edge-of-field monitoring were used for the study. Two plots were randomly assigned a rye cover crop treatment and planted with a grain drill at a rate of 112 kg ha-1 after corn silage harvest in 2015 and 2016. Continuous water flows were monitored from surface runoff and tile …

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Nitrogen Fertilizer Timing And Phosphorus And Potassium Fertilization Rates For Established Endophyte-Free Tall Fescue, D. W. Sweeney, J. K. Farney, J. L. Moyer Jan 2019

Nitrogen Fertilizer Timing And Phosphorus And Potassium Fertilization Rates For Established Endophyte-Free Tall Fescue, D. W. Sweeney, J. K. Farney, J. L. Moyer

Kansas Agricultural Experiment Station Research Reports

A tall fescue production study was conducted at two locations, beginning in the fall of 2016 and the fall of 2017. At both sites, phosphorus (P) fertilization rate only affected the spring harvest, with few differences in yield. Applying nitrogen (N) in late fall or late winter resulted in greater spring yields than applying N in spring or not applying N. However, at Site 1 in 2017 fall harvest yields were greater from the spring N applica­tion, but this response was less at Site 2 in 2018. In both years, applying N increased tall fescue yield, but at Site 2 …

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Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Sara Kidd, Ronald Simpson, Samantha Zidd Jan 2019

Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Sara Kidd, Ronald Simpson, Samantha Zidd

Williams Honors College, Honors Research Projects

Harmful Algal Blooms (HABs) are a devastating ecological and economic consequence of the abundance of nutrient-rich agricultural runoff entering aquatic ecosystems (Baker et al. 2014). Bioavailable phosphorus from synthetic fertilizers is one of the major nutrients contributing to this global issue. Preliminary studies indicate that dissolved phosphorus can be removed from an aqueous environment when passed through a composite mixture of granular steel wool particles and activated carbon (Erickson, Gulliver, and Weiss (2007). Further research was conducted using higher quality concentration measurements to determine what grades of steel wool (0000, 000, 00) and types of activated carbon (GAC, PAC, EAC) …

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Determination Of Efficacy Of Smizyme Ts G5 2,500 Phytase In Nursery Pigs, M. R. Wensley, J. C. Woodworth, J. M. Derouchey, S. S. Dritz, M. D. Tokach, R. D. Goodband, J. Faser Jan 2019

Determination Of Efficacy Of Smizyme Ts G5 2,500 Phytase In Nursery Pigs, M. R. Wensley, J. C. Woodworth, J. M. Derouchey, S. S. Dritz, M. D. Tokach, R. D. Goodband, J. Faser

Kansas Agricultural Experiment Station Research Reports

A total of 320 nursery pigs (DNA; 241 × 600; initially 22.9 lb BW) were used in a 21-d growth trial to determine the available P (aP) release curve for Smizyme TS G5 2,500 (Origination, Inc., Saint Paul, MN). Pigs were weaned at approximately 21 d of age, randomly allotted to pens based on initial body weight (BW), and fed common starter diets. On d 21 post-weaning, considered d 0 of the study, pens were blocked by BW and randomly allotted to 1 of 8 dietary treatments with 5 pigs per pen and 8 pens per treatment. Eight 1-ton batches …

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A Comparison Of Phytoplankton Nutrient Limitation Between The Marsh And Beach Environments Of Waties Island, Sc, Raymond Sgambati, George Boneillo Dec 2018

A Comparison Of Phytoplankton Nutrient Limitation Between The Marsh And Beach Environments Of Waties Island, Sc, Raymond Sgambati, George Boneillo

Honors Theses

The aim of this study was to investigate the differences in nutrient limitation within the beach and marsh environments at Waties Island, SC. Conducting the experiment on Waties Island allowed most physical factors to be held as constant, meaning the marsh and beach environments would serve as the only variables. Experiments were performed in the winter, spring, summer and fall of 2018 to determine temporal changes in limitation to phytoplankton and cyanobacteria growth. Nutrient additions included dissolved inorganic nitrogen (nitrate, nitrite, and ammonium), dissolved organic nitrogen (urea), and phosphate. To test for co-limitation, a nitrate & phosphate treatment was also …

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Effect Of Macrograzers (Campostoma Spp. And Faxonius Spp.) On Periphyton In Ozark Streams With Considerations Given To Macrograzer Biomass, Phosphorus, And Season: Mensurative And Manipulative Studies, Kayla R. Sayre Dec 2018

Effect Of Macrograzers (Campostoma Spp. And Faxonius Spp.) On Periphyton In Ozark Streams With Considerations Given To Macrograzer Biomass, Phosphorus, And Season: Mensurative And Manipulative Studies, Kayla R. Sayre

Graduate Theses and Dissertations

Nutrient and benthic algal biomass relationships can guide numeric nutrient criteria development in lotic systems. However, herbivorous macrograzers may confound this relationship by reducing the slope of the positive relationship between nutrients and periphyton biomass in streams. I conducted a mensurative field study to determine if stoneroller and crayfish abundance related to algal biomass at varying nutrient concentrations and manipulated macrograzer presence with electrical exclosures in streams to examine macrograzer effects on algal biomass and understand whether these effects on periphyton varied with total phosphorus (TP) or season. Macrograzer density was quantified across a TP gradient (n=15 streams; range = …

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Phosphorus And Potassium Fertilizer Application Strategies In Corn–Soybean Rotations, Timothy J. Boring, Kurt D. Thelen, James E. Board, Jason L. De Bruin, Chad D. Lee, Seth L. Naeve, William J. Ross, Wade A. Kent, Landon L. Ries Sep 2018

Phosphorus And Potassium Fertilizer Application Strategies In Corn–Soybean Rotations, Timothy J. Boring, Kurt D. Thelen, James E. Board, Jason L. De Bruin, Chad D. Lee, Seth L. Naeve, William J. Ross, Wade A. Kent, Landon L. Ries

Plant and Soil Sciences Faculty Publications

To determine if current university fertilizer rate and timing recommendations pose a limitation to high-yield corn (Zea mays subsp. mays) and soybean (Glycine max) production, this study compared annual Phosphorous (P) and Potassium (K) fertilizer applications to biennial fertilizer applications, applied at 1× and 2× recommended rates in corn–soybean rotations located in Minnesota (MN), Iowa (IA), Michigan (MI), Arkansas (AR), and Louisiana (LA). At locations with either soil test P or K in the sub-optimal range, corn grain yield was significantly increased with fertilizer application at five of sixteen site years, while soybean seed yield was significantly …

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Harvesting Invasive Plants To Reduce Nutrient Loads And Produce Bioenergy: An Assessment Of Great Lakes Coastal Wetlands, Brendan D. Carson, Shane C. Lishawa, Nancy C. Tuchman, Andrew M. Monks, Beth A. Lawrence, Dennis A. Albert Jun 2018

Harvesting Invasive Plants To Reduce Nutrient Loads And Produce Bioenergy: An Assessment Of Great Lakes Coastal Wetlands, Brendan D. Carson, Shane C. Lishawa, Nancy C. Tuchman, Andrew M. Monks, Beth A. Lawrence, Dennis A. Albert

School of Environmental Sustainability: Faculty Publications and Other Works

In Laurentian Great Lakes coastal wetlands (GLCWs), dominant emergent invasive plants are expanding their ranges and compromising the unique habitat and ecosystem service values that these ecosystems provide. Herbiciding and burning to control invasive plants have not been effective in part because neither strategy addresses the most common root cause of invasion, nutrient enrichment. Mechanical harvesting is an alternative approach that removes tissue‐bound phosphorus and nitrogen and can increase wetland plant diversity and aquatic connectivity between wetland and lacustrine systems. In this study, we used data from three years of Great Lakes‐wide wetland plant surveys, published literature, and bioenergy analyses …

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Clay Flocculation Effect On Microbial Community Composition In Water And Sediment, Chunyi Chen, Gang Pan, Wenqing Shi, Feng Xu, Stephen Techtmann, Susan M. Pfiffner, Terry Hazen Jun 2018

Clay Flocculation Effect On Microbial Community Composition In Water And Sediment, Chunyi Chen, Gang Pan, Wenqing Shi, Feng Xu, Stephen Techtmann, Susan M. Pfiffner, Terry Hazen

Michigan Tech Publications

Clay-based flocculation techniques have been developed to mitigate harmful algal blooms; however, the potential ecological impacts on the microbial community are poorly understood. In this study, chemical measurements were combined with 16S rRNA sequencing to characterize the microbial community response to different flocculation techniques, including controls, clay flocculation, clay flocculation with zeolite, and clay flocculation with O2 added zeolite capping. Sediment bacterial biomass measured by PLFA were not significantly altered by the various flocculation techniques used. However, 16S rRNA sequencing revealed differences in water microbial community structure between treatments with and without zeolite capping. The differences were related to …

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Changes In Soil Microbial Functioning In Coastal Wetlands Exposed To Environmental Stressors And Subsidies, Shelby M. Servais May 2018

Changes In Soil Microbial Functioning In Coastal Wetlands Exposed To Environmental Stressors And Subsidies, Shelby M. Servais

FIU Electronic Theses and Dissertations

Environmental perturbations are ubiquitous features of ecosystems and shape ecological structure and function. Climate change will alter the intensity and frequency of disturbances and expose ecosystems to novel combinations of useful inputs (subsidies) and harmful inputs (stressors). Coastal wetlands are particularly vulnerable to changing environmental conditions and are increasingly exposed to effects of interacting subsidies and stressors. In particular, the Florida Coastal Everglades, which has experienced accelerated change due to a history of water management practices, is vulnerable to new disturbances associated with climate change. The low-lying Florida Everglades faces multiple disturbances from storm surge, nutrient enrichment, and sea-level rise …

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Spatiotemporal Variation Of Nutrient Concentrations In The Upper Shule River Basin, The Qinghai-Tibetan Plateau, China, Hongzheng Pu, Yongjian Ding, Tianding Han, Fengjing Liu Mar 2018

Spatiotemporal Variation Of Nutrient Concentrations In The Upper Shule River Basin, The Qinghai-Tibetan Plateau, China, Hongzheng Pu, Yongjian Ding, Tianding Han, Fengjing Liu

Michigan Tech Publications

This study aimed to understand the spatiotemporal variation of nutrient concentrations in stream water, using analyses of total nitrogen (TN), NO3−-N, NH4+-N and total phosphorus (TP) concentrations from April to October in 2016 in the upper Shule River basin in the northeastern margin of the Qinghai-Tibetan Plateau. Dissolved inorganic nitrogen (DIN; NO3−-N + NH4+-N) concentrations in both groundwater and stream water were the predominant form of TN, accounting for about 88%. Median concentrations in stream water were 815 μg L−1 for TN, 459 μg L−1 for …

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Investigation Of The Effects Of Mineral Fertilizers (Nitrogen) On The Development Of Mulberry Trees Growing And Productivity Of Their Leaves., M Ibragimov Mar 2018

Investigation Of The Effects Of Mineral Fertilizers (Nitrogen) On The Development Of Mulberry Trees Growing And Productivity Of Their Leaves., M Ibragimov

Karakalpak Scientific Journal

The article is devoted to the study of influence of mineral fertilizers (nitric) on development and productivity mulberry leaves. It is the experimentally proved positive influence on growth and productivity of a mulberry.

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Investigation Of The Effects Of Mineral Fertilizers (Nitrogen) On The Development Of Mulberry Trees Growing And Productivity Of Their Leaves., M Ibragimov Mar 2018

Investigation Of The Effects Of Mineral Fertilizers (Nitrogen) On The Development Of Mulberry Trees Growing And Productivity Of Their Leaves., M Ibragimov

Karakalpak Scientific Journal

The article is devoted to the study of influence of mineral fertilizers (nitric) on development and productivity mulberry leaves. It is the experimentally proved positive influence on growth and productivity of a mulberry.

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