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Planting Native Grasses: Missouri Forage and Livestock Series
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Pat Keyser (University of Tennessee) and Rick Rath (Missouri Department of Conservation) share about establishing and managing native grasses on pasture lands. Native grasses benefit not only livestock, but wildlife too. This webinar can help practitioners and landowners alike.
Filmed January 20, 2021 - Missouri Forage and Livestock Series
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Webinars and Instructional Videos
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Certified Biomass Procurement Specialist - Switchgrass
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This eight-hour online course is designed to prepare agriculturists to work with farmers as employees of a bio-refinery to provide its feedstock needs. Course topics include site selection, soils, drainage, fertility, varieties, weed control, selecting growers, contracts, production systems and other switchgrass production issues. Course instructors are specialists from Auburn University, University of Tennessee, University of Kentucky and Genera Energy. For more information or to enroll contact Mark Hall (hallmah@auburn.edu).
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Evolution of Grasses and Grassland Ecosystems
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The evolution and subsequent ecological expansion of grasses (Poaceae) since the Late Cretaceous have resulted in the establishment of one of Earth’s dominant biomes, the temperate and tropical grasslands, at the expense of forests. In the past decades, several new approaches have been applied to the fossil record of grasses to elucidate the patterns and processes of this ecosystem transformation. The data indicate that the development of grassland ecosystems on most continents was a multistage process involving the Pale- ogene appearance of (C3 and C4) open-habitat grasses, the mid-late Cenozoic spread of C3 grass-dominated habitats, and, finally, the Late Neogene expansion of C4 grasses at tropical-subtropical latitudes. The evolution of herbivores adapted to grasslands did not necessarily coincide with the spread of open-habitat grasses. In addition, the timing of these evolutionary and ecological events varied between regions. Consequently, region-by-region investigations using both direct (plant fossils) and indirect (e.g., stable carbon isotopes, faunas) evidence are required for a full understanding of the tempo and mode of grass and grassland evolution.
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Climate Science Documents
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Conifer regeneration following stand-replacing wildfire varies along an elevation gradient in a ponderosa pine forest, Oregon, USA
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Climate change is expected to increase disturbances such as stand-replacing wildfire in many ecosystems, which have the potential to drive rapid turnover in ecological communities. Ecosystem recovery, and therefore maintenance of critical structures and functions (resilience), is likely to vary across environmental gradients such as moisture availability, but has received little study. We examined conifer regeneration a decade following complete stand-replacing wildfire in dry coniferous forests spanning a 700 m elevation gradient where low elevation sites had relatively high moisture stress due to the combination of high temperature and low precipitation. Conifer regeneration varied strongly across the elevation gradient, with little tree regeneration at warm and dry low elevation sites. Logistic regression models predicted rapid increases in regeneration across the elevation gradient for both seedlings of all conifer species and ponderosa pine seedlings individually. This pattern was especially pronounced for well-established seedlings (P38 cm in height). Graminoids dominated lower elevation sites following wildfire, which may have added to moisture stress for seedlings due to competition for water. These results suggest moisture stress can be a critical factor limiting conifer regeneration following stand- replacing wildfire in dry coniferous forests, with predicted increases in temperature and drought in the coming century likely to increase the importance of moisture stress. Strongly moisture limited forested sites may fail to regenerate for extended periods after stand-replacing disturbance, suggesting these sites are high priorities for management intervention where maintaining forests is a priority.
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Effects of grazing on grassland soil carbon: a global review
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Soils of grasslands represent a large potential reservoir for storing CO2, but this potential likely depends on how grasslands are managed for large mammal grazing. Previous studies found both strong positive and negative grazing effects on soil organic carbon (SOC) but explanations for this variation are poorly developed. Expanding on previous reviews, we performed a multifactorial meta-analysis of grazer effects on SOC density on 47 independent experimen- tal contrasts from 17 studies. We explicitly tested hypotheses that grazer effects would shift from negative to positive with decreasing precipitation, increasing fineness of soil texture, transition from dominant grass species with C3 to C4 photosynthesis, and decreasing grazing intensity, after controlling for study duration and sampling depth. The six variables of soil texture, precipitation, grass type, grazing intensity, study duration, and sampling depth explained 85% of a large variation (`150 g m␣2 yr␣1) in grazing effects, and the best model included significant interactions between precipitation and soil texture (P = 0.002), grass type, and grazing intensity (P = 0.012), and study duration and soil sampling depth (P = 0.020). Specifically, an increase in mean annual precipitation of 600 mm resulted in a 24% decrease in grazer effect size on finer textured soils, while on sandy soils the same increase in precipitation pro- duced a 22% increase in grazer effect on SOC. Increasing grazing intensity increased SOC by 6–7% on C4-dominated and C4–C3 mixed grasslands, but decreased SOC by an average 18% in C3-dominated grasslands. We discovered these patterns despite a lack of studies in natural, wildlife-dominated ecosystems, and tropical grasslands. Our results, which suggest a future focus on why C3 vs. C4-dominated grasslands differ so strongly in their response of SOC to grazing, show that grazer effects on SOC are highly context-specific and imply that grazers in different regions might be managed differently to help mitigate greenhouse gas emissions.
Keywords: carbon sequestration, grasslands, grazing, grazing intensity, precipitation, soil organic carbon, soil texture
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Producer Adoption of Native Grass Forages
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Pat Keyser (Center for Native Grasslands, University of Tennessee) describes opportunities for practitioners to better partner with livestock producers to adopt native grass forages and advance working lands conservation. What is good for the cows is good for native species too. This webinar was presented as part of the Mississippi Flyway Summit in September 2020.
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Native Grass College: Video series
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The Native Grass College offers short videos and resources for practitioner and landowners to learn how to 1) Establish Native Grasses, 2) Control Grass Competition, and 3) Manage grazing. Native grasses are better for grazing and for wildlife. Developed by Dr. Pat Keyser, Center for Native Grasslands Management at the University of Tennessee.
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Winter Grazing - a Better Way to Feed
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In this video, three livestock producers describe how extending the grazing season with winter grasses has saved them time and money, while also improving the environment; and they demonstrate the methods they used to achieve these savings. Sponsored by the NRCS - East National Technology Support Center.
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