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Articles 4021 - 4050 of 10146
Full-Text Articles in Agronomy and Crop Sciences
Evaluating Functional Diversity As Potential Early-Warning Indicator Of Rangeland Degradation, L.-M. Schwarz, C. P. Carmona, M. C. Bilton, F. Munyebvu-Chambara, K. Behn, A. Linstädter
Evaluating Functional Diversity As Potential Early-Warning Indicator Of Rangeland Degradation, L.-M. Schwarz, C. P. Carmona, M. C. Bilton, F. Munyebvu-Chambara, K. Behn, A. Linstädter
IGC Proceedings (1977-2023)
Droughts and overgrazing play a crucial role in the degradation of semi-arid rangelands. This is evident in the loss of palatable long-lived grass species and bush encroachment. Early warning indicators are needed to mitigate long-term degradation and decline in essential forage provision. Functional diversity provides valuable information on ecosystem health. However, functional diversity indices have not yet been tested regarding their applicability as early warning indicators, revealing non-linear threshold behaviour. We therefore examined the following questions: (1) How do functional diversity indices respond to grazing pressure? (2) Does land tenure affect the relationship between functional diversity and grazing pressure? (3) …
Integrating Grazing With 2,4-D And Florpyrauxifen To Control Broadleaf Weeds And Maintain Red Clover Productivity In Grass-Legume Pastures, M. J. Renz, G. M. Imhoff
Integrating Grazing With 2,4-D And Florpyrauxifen To Control Broadleaf Weeds And Maintain Red Clover Productivity In Grass-Legume Pastures, M. J. Renz, G. M. Imhoff
IGC Proceedings (1977-2023)
In grass-legume pastures, 2,4-D-amine + florpyrauxifen-benzyl controls broadleaf weeds but red clover (Trifolium pratense L.) is eliminated. Grazing within a week prior to herbicide application is likely to reduce leaf surface area and may reduce red clover injury and maintain productivity. Experiments were conducted in 2020 and in 2021 to determine if red clover could be productive when 560 g ae ha-1 2,4-D-amine + 6.3 g ae ha-1 of florpyrauxifen-benzyl with 1% v/v methylated seed oil applied in the spring was grazed before or after herbicide application. Grazing timings occurred 6, 4, or 2 days prior to herbicide …
Effect Of Simulated Precipitation On Soil Enzyme Activity Of Stipa Breviflora Desert Steppe, Ren Zihuana, Wang Zhongwub, Han Guodongb
Effect Of Simulated Precipitation On Soil Enzyme Activity Of Stipa Breviflora Desert Steppe, Ren Zihuana, Wang Zhongwub, Han Guodongb
IGC Proceedings (1977-2023)
The availability of nutrients for the grassland ecosystem is significantly influenced by changes in soil enzyme activity brought on by precipitation. Soil enzyme activity is an essential element controlling soil nutrient supply. This study used the Inner Mongolian desert steppe as its research subject and examined how different soil enzymes—urease, alkaline phosphatase, and invertase reacted to changing precipitation levels. According to the typical quantity of long-term precipitation in the area, four gradients of precipitation were established: 50% reduction (P1), control (P2), 50% increase (P3), and 100% increase (P4). First, the findings revealed that rising precipitation can boost invertase and alkaline …
Survival Rate And Morphological Growth Patterns Of Five Populations Of Festuca Dolichophylla Under Similar Conditions, Y. Paucar, E. R. Flores, H. M. Guillén, L. Aguirre
Survival Rate And Morphological Growth Patterns Of Five Populations Of Festuca Dolichophylla Under Similar Conditions, Y. Paucar, E. R. Flores, H. M. Guillén, L. Aguirre
IGC Proceedings (1977-2023)
The majority of the natural grasslands of Perú are located in the Puna region; they are the only source of feed for raising animals in this area, and they also protect the soil from erosion. Festuca dolichophylla is a representative species with high productivity in this ecosystem. The aim of this study was to evaluate survival rate and morphological growth patterns of five populations of Festuca dolichophylla under similar conditions. Five accessions were obtained from each population: Pastales Huando Peasant Community - Huancavelica (CCPH), Lachocc South American Camelids Research and Development Center of the National University of Huancavelica (CIDCSL), Junin, …
Enhancing Milk Production Of Lactating Camels In Kenya Via Supplementation Of The Invasive Cactus (Opuntia Stricta) In The Diet, W. O. Owino, Lucy W. Ikanya, J. G. Maina, C. K. Gachuiri, José C. B. Dubeux Jr.
Enhancing Milk Production Of Lactating Camels In Kenya Via Supplementation Of The Invasive Cactus (Opuntia Stricta) In The Diet, W. O. Owino, Lucy W. Ikanya, J. G. Maina, C. K. Gachuiri, José C. B. Dubeux Jr.
IGC Proceedings (1977-2023)
Climate change leading to prolonged and recurrent droughts, changes in land use, primarily settlement of pastoralists, followed by overgrazing and subsequent land degradation, has made the highly drought resistant opuntia flourish and be aggressively invasive in the Kenya’s rangelands. Camel keeping has increasingly replaced cattle as a climate adaptation strategy and also as a result of a steady increase in demand for camel milk due to the associated nutritional and health benefits,To address the challenge of lack of pasture during prolonged drought, there is the need to utilize the invasive cactus as fodder. The invasive cactus can be a kind …
Potential Of Indigenous Desert Grasses For Forage Production In A Water-Scarce Region, A. E. Osman
Potential Of Indigenous Desert Grasses For Forage Production In A Water-Scarce Region, A. E. Osman
IGC Proceedings (1977-2023)
Indigenous perennial grasses are widely distributed in the Arabian Peninsula. Their survival under limited rainfall and grazing suggests a potential role as grassland species and for rehabilitation of degraded rangelands. Forage productivity and water-use efficiency (WUE) was determined over 2 years for four indigenous grasses: buffel grass (Cenchrus ciliaris L.), dakhna (Coelachyrum piercei Benth.), da’ay (Lasiurus scindicus Henr.) and tuman (Panicum turgidum Forssk.) together with one exotic species, rhodes grass (Chloris gayana Kunth) in the central region of the United Arab Emirates. Three irrigation treatments were used: R1 (1858–6758 m3 ha-1 year-1 …
Effect Of Land Management On Grassland Carbon Dioxide Fluxes, M. O’Neill, S. F. Islam, J. Rambaud, G. J. Lanigan, K. G. Richards, M. B. Lynch
Effect Of Land Management On Grassland Carbon Dioxide Fluxes, M. O’Neill, S. F. Islam, J. Rambaud, G. J. Lanigan, K. G. Richards, M. B. Lynch
IGC Proceedings (1977-2023)
Grassland soils can act as both a source and sink for atmospheric carbon dioxide (CO2). Implementing grassland management practices that increase the rates of soil CO2 sequestration are urgently sought to offset Ireland’s agricultural greenhouse gas emissions. However, land management of Irish grasslands is not yet accounted for in the national inventories simultaneously posing a limitation and opportunity for refining modelled estimates of carbon sequestration. In this study, eddy covariance flux towers were established to monitor net ecosystem CO2 exchange (NEE), gross primary productivity (GPP) and ecosystem respiration (Re) in three grassland types (intensive dairy grazing, drystock grazing and zero- …
Fe And Mn Concentrations In Plants Correlated Negatively With Air Temperature Precipitation In Three Types Of Grassland, Jiao Ning, Fujiang Hou, Shengsheng Liu
Fe And Mn Concentrations In Plants Correlated Negatively With Air Temperature Precipitation In Three Types Of Grassland, Jiao Ning, Fujiang Hou, Shengsheng Liu
IGC Proceedings (1977-2023)
Alpine meadows, typical steppe, and deserts are globally important grassland ecosystems. We investigated the seasonal trends in Fe and Mn concentrations in the dominant species and community of plants from diverse grassland types in northwest China. It was found that seasonal Fe and Mn concentrations in most plant species were negatively correlated with seasonal precipitation, biomass, and temperature. Additionally, seasonal Cu concentrations in Reaumuria soongorica was significantly correlated with seasonal precipitation. The seasonal mean temperature explained more of the seasonal variation of the Fe and Mn concentrations in the plant community of these grasslands than precipitation, except for the concentrations …
Comprehensive Evaluation Of Endophytic Fungi And Rhizosphere Soil Fungi On The Growth Of Achnatherum Inebrians, X. M. Nie, X. X. Zhang, Z. B. Nan
Comprehensive Evaluation Of Endophytic Fungi And Rhizosphere Soil Fungi On The Growth Of Achnatherum Inebrians, X. M. Nie, X. X. Zhang, Z. B. Nan
IGC Proceedings (1977-2023)
This study was conducted to clarify the effect of endophytic fungi and rhizosphere soil fungi on the growth of Achnatherum inebrians. In this study, the seeds of A. inebrians with endophyte-infected (EI) and endophyte-free (EF) were used as materials. Eight fungi isolated from rhizosphere soil were inoculated through germination and greenhouse pot experiment. The results showed that the endophytes, rhizosphere soil fungi and their combined effect all had significant effect on the seed germination and plant growth of A. inebrians, and the affected factors varied with the tested materials and strains. Through comprehensive evaluation of principal component analysis …
Vicuñas’ (Vicugna Vicugna Mensalis) Diet Composition Under Community Management In The Puna Grasslands, Katherine Capuñay, Samuel Pizarro, Javier Ñaupari
Vicuñas’ (Vicugna Vicugna Mensalis) Diet Composition Under Community Management In The Puna Grasslands, Katherine Capuñay, Samuel Pizarro, Javier Ñaupari
IGC Proceedings (1977-2023)
The objective of the present study was to determine the composition of the vicuña (V. vicugna mensalis) diet at the end of the drought period (November, 2019) in the San Cristobal de Lucanas Community, in the department of Ayacucho, Peru. Eight sites were chosen, where vicuñas were observed grazing in Pajonal (tussock grassland), Cesped (short grassland), Pajonal-Cesped and Tholar-grass. For the botanical composition of the diet, fecal samples were collected in 80 dung piles, which were prepared for microhistological analysis and determined the plants consumed in the vicuña’s diet. The botanical composition of the diets in the different …
Degradation And Vulnerability To Climate Change In High Andean Rangelands, Samuel Pizarro, Javier Ñaupari
Degradation And Vulnerability To Climate Change In High Andean Rangelands, Samuel Pizarro, Javier Ñaupari
IGC Proceedings (1977-2023)
Rangeland degradation is a process associated with loss of ecosystem equilibrium. Therefore, this work seeks to identify the most important factors that cause the degradation process of rangelands, assess the degree of degradation and vulnerability to current climate change of these ecosystems; and determine if there is a relationship between the degree of rangeland degradation and vulnerability to climate change in high Andean rangelands. The study was located in the central highlands of Peru (Ancash, Junín, Pasco, Huancavelica and Lima) and involved the design of a framework to assess rangeland degradation based on field information and Landsat satellite products that …
Grass Diversity And Pasture Quality Baseline Assessement In Central Madagascar, O. P. Nanjarisoa, L. Randriamanalina, Wayne F. Truter, M. T. Rajaonah, C. E. R. Lehmann, C. Birkinshaw, L. Rakotonirina, D. Miarinjanahary, N. L. Raharinirina, M. S. Vorontsova
Grass Diversity And Pasture Quality Baseline Assessement In Central Madagascar, O. P. Nanjarisoa, L. Randriamanalina, Wayne F. Truter, M. T. Rajaonah, C. E. R. Lehmann, C. Birkinshaw, L. Rakotonirina, D. Miarinjanahary, N. L. Raharinirina, M. S. Vorontsova
IGC Proceedings (1977-2023)
Poaceae family contributes to Madagascar’s biodiversity hotspot with 217 of 541 grass species endemic to the island, although their forage value is unknown, at least in the scientific literature. Our research aims 1) to describe the diversity of native and endemic grasses thereby recognising the role of grass species diversity in forage and ecosystem management and 2) to provide new knowledge about pasture management based on the relationship between grazing capacity and productivity within experimental pastureland plots under different fire and grazing treatments. Our study seeks to provide information to inform improvements in livestock nutrition via grazing management of natural …
Effects Of Proximity To Roads On Tissue Surface Ph, Conductivity And Heavy Metal Contents Of A Grazing Grass Species, C. Munyati, M. S. Mathole
Effects Of Proximity To Roads On Tissue Surface Ph, Conductivity And Heavy Metal Contents Of A Grazing Grass Species, C. Munyati, M. S. Mathole
IGC Proceedings (1977-2023)
Globally, road networks are expanding in the countryside. Though beneficial to society, the roads potentially have detrimental effects on grazing quality. The effects are seldom quantified. In this study Eragrostis lehmanniana, a common native grazing grass in parts of the world, was examined for indicative data on the impacts of roads on grasses. Aboveground tissue samples were collected monthly on three occasions during the growing season, at the same respective locations near three high traffic highways. Non-senescent specimens were sampled along transects of up to 400 m perpendicular to the highways, starting from the road edge and then at …
Screening Annual Ryegrass For Increased Tolerance To Blast (Pyricularia Oryzae), C. M. Adams, B. S. Baldwin, J. L. Morrison
Screening Annual Ryegrass For Increased Tolerance To Blast (Pyricularia Oryzae), C. M. Adams, B. S. Baldwin, J. L. Morrison
IGC Proceedings (1977-2023)
Annual ryegrass [Lolium perenne L. spp. multiflorum (Lam.) Husnot] is a high-quality forage utilized heavily in the Southeast for pasture and grazing. Gray Leaf Spot (Pyricularia oryzae) is a fungal pathogen that infects gramineous species and is a common problem in perennial and annual ryegrass stands. This study was designed to screen for resistance to P. oryzae in the annual ryegrass cultivar Vertyl (PI 619473, FRA) and a heat-tolerant germplasm (HTARG5) derived from Marshall (PI 600770, USA) with intent to use recurrent phenotypic selection to crossbreed the two accessions. Marshall was also included as a susceptible reference …
Tiller Demography Within Synthetic Grass Populations, K. J. Moore, C. Córdova
Tiller Demography Within Synthetic Grass Populations, K. J. Moore, C. Córdova
IGC Proceedings (1977-2023)
Like other populations of biological organisms, the collective aging structure of a population of grass tillers has meaning and consequences far beyond the development of an individual within it. Using various methods, it is possible to assign numerical indices to tiller development so that it can be described numerically. By sampling a population of tillers and assigning a numerical index to each, the average stage of tillers within a population can be calculated and a repeatable assessment of its development determined. The average or mean stage count (MSC) of tiller development is commonly calculated and used to compare the development …
Soil Seed Banks Along A Woody Plant Removal Gradient In A Semi-Arid Savanna Of South Africa: Implications For Restoration, Mthunzi Mndela, Mziwanda Mangwane, Nothando Ngcobo, Nchaupa Johannes Rasekgokga, Piet Monegi
Soil Seed Banks Along A Woody Plant Removal Gradient In A Semi-Arid Savanna Of South Africa: Implications For Restoration, Mthunzi Mndela, Mziwanda Mangwane, Nothando Ngcobo, Nchaupa Johannes Rasekgokga, Piet Monegi
IGC Proceedings (1977-2023)
Woody plant encroachment threatens ecosystem services and functions, thereby reducing herbaceous plant population persistence and community stability. Consequently, woody plant control projects are implemented in South Africa to restore herbaceous vegetation. Because persistent seeds drive passive restoration and vegetation trajectories, management following woody plant control entails examining soil seed bank (SSB) size and composition. However, a knowledge gap exists regarding how SSB characteristics respond along a woody plant removal gradient. This study was conducted at Roodeplaat in Gauteng Province of South Africa to assess the impact of woody density reduction [hereafter woody plant removal intensity (WPRI)] on SSB density, composition, …
An Investigation On Food Habits Of Persian Gazelle In Cheshmeh Gol Reproduction Station Of Khorasan Province, Iran, I. Mohammdi-Abiz, Kamal Naseri, Mansour Mesdaghi, H. Yazdandad
An Investigation On Food Habits Of Persian Gazelle In Cheshmeh Gol Reproduction Station Of Khorasan Province, Iran, I. Mohammdi-Abiz, Kamal Naseri, Mansour Mesdaghi, H. Yazdandad
IGC Proceedings (1977-2023)
Persian gazelle (Gazella subgutturosa) is one of the most important wild species in Iran. This species prefers plain and low hill habitats which are dominated by sagebrush (Artemisia sieberi). However, due to extensive hunting and habitat destruction, the populations of gazelle were declined and this valuable species was recorded as threatened species in 2006. To rehabilitate the habitats of gazelle and improve their productivity, Cheshmeh-Gol captive reproduction station with an area of 50 hectares was established. To provide more reliable information on diet requirements of gazelle, direct observation and cafeteria feeding on captive animals were employed. …
Crop Yield Estimation And Carrying Capacity In Sar Ali-Abad Summer Rangelands Of Golestan Province, Iran, Mansour Mesdaghi, Nafiseh Fakhar Izadi
Crop Yield Estimation And Carrying Capacity In Sar Ali-Abad Summer Rangelands Of Golestan Province, Iran, Mansour Mesdaghi, Nafiseh Fakhar Izadi
IGC Proceedings (1977-2023)
High mountain grassland ecosystems are the best pastures of Golestan province in Iran. These grasslands are an effective means of soil conservation and offer standing green fodder for livestock. Sar Ali-abad summer rangeland with an area of 780 ha is a representative of mountain ecosystems of Golestan province. Estimating forage production to avoid overgrazing is a necessity to ensure the long-term sustainability of these natural ecosystems. To estimate rangeland productivity and carrying capacity was the major objective while, comparing three methods of clipping and weighing (CW), double sampling (DS), and comparative yield (CY) by using 1-m2 plots was the …
Soil C Stocks And Soil Quality In Integrated Crop-Livestock-Forestry In Brazil, B. E. Madari, M. T. M. Carvalho, P. S. Matos, J. M. Oliveira, P. L. O. A. Machado
Soil C Stocks And Soil Quality In Integrated Crop-Livestock-Forestry In Brazil, B. E. Madari, M. T. M. Carvalho, P. S. Matos, J. M. Oliveira, P. L. O. A. Machado
IGC Proceedings (1977-2023)
Integrated Crop-Livestock-Forestry systems (ICLF) are potential carbon sinks. Here we present soil organic carbon (SOC) stocks in an ICLF system at 3 and 11 years after implementation. The ICLF was implemented in 2008/2009 at Boa Vereda farm, in Cachoeira Dourada, Goiás state, Central-West region of Brazil, on a clay Ferralsol. SOC stocks were determined within and between rows of trees, hereby called alley, in three soil layers (0.0-0.3, 0.3-1.0 and 0.0-1.0 m) in 2012 and 2020. A non-cultivated pasture was used as reference. Results show a trend for increased soil C stocks at 0.0-1.0 m under ICLF system from 3 …
Natural Regeneration Of Severely Degraded Terrestrial Arid Ecosystems Needs More Than Just Removing The Cause Of The Degradation, M. Louhaichi, M. Gamoun, N. Al Hashash, F. Al-Ameer, D. Alrashedi, A. Redha, F. Alkandari, A. Niane
Natural Regeneration Of Severely Degraded Terrestrial Arid Ecosystems Needs More Than Just Removing The Cause Of The Degradation, M. Louhaichi, M. Gamoun, N. Al Hashash, F. Al-Ameer, D. Alrashedi, A. Redha, F. Alkandari, A. Niane
IGC Proceedings (1977-2023)
Rangelands cover over 75% of Kuwait’s total land area. Most of these rangelands are severely degraded because of overgrazing, poor anthropic utilization, and mismanagement. Restoring natural rangelands is a way to increase forage productivity, enhance biodiversity, and achieve sustainable development. When degradation has not reached the point of irreversibility, natural restoration through resting is one of the best low-cost restoration techniques. This study evaluated the effect of natural restoration on vegetation cover and species richness in the desert rangelands of Kuwait. The studied rangeland was a completely fenced area of 1 km2. The percent of vegetation was measured using the …
Biodiversity And The Ecological Role Of Grasslands Environment And Territory, Elimane Lo, Makhmutov Serguei, Badim Almazov
Biodiversity And The Ecological Role Of Grasslands Environment And Territory, Elimane Lo, Makhmutov Serguei, Badim Almazov
IGC Proceedings (1977-2023)
Biodiversity is all the living species that inhabit the planet: plants, animals, microorganisms, but also their genetic diversity and all the ecosystems in which they live. The preservation of biodiversity is vital, because the organisms that constitute it participate in the major ecological cycles of air, soil and water It is today recognized for its intrinsic value and for the functions it provides in ecosystems. The grassland and the hedges that surround them play a key role in carbon storage, water purification, biodiversity and the typicity of landscapes. They partly provide the plants necessary for feeding herds of herbivores (cattle, …
Legacy Effects Of Herbivory Trampling On Soil Organic Carbon Via Soil Properties, Plant Biomass And Functional Traits, Lan Li, Fujiang Hou
Legacy Effects Of Herbivory Trampling On Soil Organic Carbon Via Soil Properties, Plant Biomass And Functional Traits, Lan Li, Fujiang Hou
IGC Proceedings (1977-2023)
Herbivores are important for ecosystem biogeochemistry, including soil carbon pools. Non-trophic interactions between herbivores and soil processes have recently gained attention, but remain underexplored. They include both direct and indirect effects of herbivore behaviour and physical soil disturbance by herbivores (e.g., trampling) causing compaction, and therefore probably influence historical contingency; however, little empirical data on the persistent impact or legacy effect of trampling and subsequent drivers of shifts are available. To address the knowledge gaps described above, we investigated whether the soil organic C (SOC) is driven by the legacy effect of sheep trampling intensity (0, 40, 80 and 120 …
Belowground Productivity In Patches Of Heterogeneous Grass Swards After Nearly Two Decades Of Low-Intensity Cattle Grazing, M. Komainda, J. Isselstein
Belowground Productivity In Patches Of Heterogeneous Grass Swards After Nearly Two Decades Of Low-Intensity Cattle Grazing, M. Komainda, J. Isselstein
IGC Proceedings (1977-2023)
In low-input grassland, patch-grazing leads to tall and short patches that provide different growth conditions for the grass sward. Since belowground biomass and the associated turnover represent the main carbon input to soil in grassland, we investigated within-pasture variation of above- and belowground net primary production in relation to patches over one year of production in a long-term grazing experiment during the year 2022. The analysis of above- and belowground net primary production showed an effect of patch types, partly in interaction with the month, indicating a strong variation due to climatic conditions. In those few cases where differences existed …
Back To The Future: Achieving Resilient, Sustainable Grasslands Through Restoration Of Ecological Norms / Overview – The Problem, The Opportunity, Pat D. Keyser, C. Bitler
Back To The Future: Achieving Resilient, Sustainable Grasslands Through Restoration Of Ecological Norms / Overview – The Problem, The Opportunity, Pat D. Keyser, C. Bitler
IGC Proceedings (1977-2023)
Grasslands are one of the largest biomes on earth, are the largest agricultural enterprise in the U.S., serve as a major carbon pool, produce high quality dietary proteins, and host a rich biodiversity. However, grasslands, including those of the eastern U.S., have been heavily altered and degraded reducing their resiliency and negatively impacting native fauna. Recent scientific advances in grassland establishment and management, along with the opportunity to monetize the carbon benefits of native grasslands, could provide the needed social and economic support to make such restoration possible on a large scale. Where restored grassland communities align with historical, ecological …
Grass Vegetation Dynamics In Wetlands With Different Utilization, Dorai Pandian Kannan
Grass Vegetation Dynamics In Wetlands With Different Utilization, Dorai Pandian Kannan
IGC Proceedings (1977-2023)
The land-use patterns, combined with the biotic interactions, are likely to substantially affect the grass community of tropical wetlands. However, we need more information to understand the vegetation cover and, particularly, the diversity of grasses in the protected sites, where the naturally occurring interactions with extreme complexity. Hence a thorough understanding of these interactive effects on grass dynamics would help develop wildlife management guidelines to predict the grass-woody herbs and other associated vegetation. In light of this, a beta vegetation survey and diversity analysis in two varying wetland ecosystems of natural mountain streams and temporary ponds. Grass communities occurred along …
Mechanisms Of Ecosystem Carbon Exchange In Response To Grazing Rates In Two Hydrologically Contrasting Growing Seasons In A Desert Steppe, Y. X. Jin, D. S. Tian, Q. Wu, Y. H. Wang, G. D. Han
Mechanisms Of Ecosystem Carbon Exchange In Response To Grazing Rates In Two Hydrologically Contrasting Growing Seasons In A Desert Steppe, Y. X. Jin, D. S. Tian, Q. Wu, Y. H. Wang, G. D. Han
IGC Proceedings (1977-2023)
Chronic grazing affects grassland soil processes and plant community composition, which may create novel patterns of net ecosystem carbon exchange (NEE) under the mediation of precipitation. Here, we report results from a 14-year field manipulative experiment with four stocking rates in a Stipa breviflora desert steppe in northern China. Ecosystem carbon exchange as well as plant aboveground biomass and composition were measured in the two growing seasons (including a wet and dry growing season). Our results showed a significant interannual variation in CO2 fluxes, heavy grazing significantly reduced NEE regardless of precipitation. Grazing-induced changes in NEE were largely attributable …
Soil C Change Over 14 Years In Grasslands Sown Into A Highly Disturbed Soil, R. D. Jackson, J. Stier
Soil C Change Over 14 Years In Grasslands Sown Into A Highly Disturbed Soil, R. D. Jackson, J. Stier
IGC Proceedings (1977-2023)
Perennial grasslands are thought to sequester C, so restoring them is touted as part of the solution for mitigating climate change. Moreover, there is growing interest among managed grassland stakeholders in selling C credits on nascent C markets. Former agricultural and municipal sites are often considered viable areas for conversion to grasslands, with types ranging from unmanaged prairies with diverse plant communities to monocultures in highly managed urban environments. We sowed five perennial plant communities into an area that had undergone massive soil disturbance five years previous during conversion from row crop agriculture to C3 turf. We found that soils …
Length Of Multi-Year Precipitation And Primary Production Relationships Vary Regionally Across Grasslands In The Central U.S., A. R. Hudson, D. P.C. Peters
Length Of Multi-Year Precipitation And Primary Production Relationships Vary Regionally Across Grasslands In The Central U.S., A. R. Hudson, D. P.C. Peters
IGC Proceedings (1977-2023)
Grasslands in the central United States span large temperature and aridity gradients and regionally differ in their drivers of water availability. These differences likely determine how drought event periodicity and duration can influence grassland growth, and are important to consider as global warming changes energy and water distribution across these systems. Here, we explored frequency patterns in annual grassland plant growth (aboveground net primary productivity (ANPP)) and precipitation (PPT) relationships for over 20 years at six long-term research sites spatially distributed across the central grassland region. We identified the periods (>1 year) these relationships are strongest- and when they …
Community Asynchrony Increased Its Stability By Mediating The Relationship Of Diversity–Stability Relationships In Loess Plateau, China, Fujiang Hou, Xiaojuan Huang, Jing Zhang
Community Asynchrony Increased Its Stability By Mediating The Relationship Of Diversity–Stability Relationships In Loess Plateau, China, Fujiang Hou, Xiaojuan Huang, Jing Zhang
IGC Proceedings (1977-2023)
Extreme weather such as heavy rainfall and drought are threatening the global grassland and its potential to mitigate climate change. Therefore, understanding the drivers that promote the stability of grassland ecosystems is considered to be critical to mitigate the adverse effects of climate change on grasslands. Here, we use precipitation addition (PA) + grazing experiment to explain how species richness, aboveground biomass, species asynchrony, functional group level stability, drought tolerance and grazing tolerance can maintain grassland productivity stability. The results showed that grazing counteracted the promoting effect of rainfall on vegetation to a certain extent, and weakened the sensitivity of …
Nutrient Balances Of Rewetted Fens – Groundwater Lysimeter Results, J. Hoysagk, M. Pesch, F. Eulenstein, A. Behrendt
Nutrient Balances Of Rewetted Fens – Groundwater Lysimeter Results, J. Hoysagk, M. Pesch, F. Eulenstein, A. Behrendt
IGC Proceedings (1977-2023)
With the raising of groundwater levels to protect fens and the climate, there may be a risk of nutrients, such as nitrogen or potassium, leaching into the groundwater. Great amounts of nutrients, which are accumulated largely by peat forming plants like Phragmites australis and Carex spec., are conveyed into rewetted fens through high amounts of introduced water. Nitrogen leaching into the groundwater is very low even at the beginning of flooding and there is no sudden, pronounced leaching. Only a portion of potassium is taken up by plants whereas the rest might be found in the groundwater. Increasing nutrient inputs …