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On the difference in the net ecosystem exchange of CO2 between deciduous and evergreen forests in the southeastern United States
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The southeastern United States is experiencing a rapid regional increase in the ratio of pine to deciduous forest ecosystems at the same time it is experiencing changes in climate. This study is focused on exploring how these shifts will affect the carbon sink capacity of southeastern US forests, which we show here are among the strongest carbon sinks in the continental United States. Using eight-year-long eddy covariance records collected above a hardwood deciduous forest (HW) and a pine plantation (PP) co-located in North Carolina, USA, we show that the net ecosystem exchange of CO2 (NEE) was more variable in PP, contributing to variability in the difference in NEE between the two sites (DNEE) at a range of timescales, including the interannual timescale. Because the variability in evapotranspira- tion (ET) was nearly identical across the two sites over a range of timescales, the factors that determined the variabil- ity in DNEE were dominated by those that tend to decouple NEE from ET. One such factor was water use efficiency, which changed dramatically in response to drought and also tended to increase monotonically in nondrought years (P < 0.001 in PP). Factors that vary over seasonal timescales were strong determinants of the NEE in the HW site; however, seasonality was less important in the PP site, where significant amounts of carbon were assimilated outside of the active season, representing an important advantage of evergreen trees in warm, temperate climates. Additional variability in the fluxes at long-time scales may be attributable to slowly evolving factors, including canopy structure and increases in dormant season air temperature. Taken together, study results suggest that the carbon sink in the southeastern United States may become more variable in the future, owing to a predicted increase in drought frequency and an increase in the fractional cover of southern pines.
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Resource & Land Consultants
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RLC ensures development + land management projects comply with local, state, and federal environmental laws and regulations.
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Richter, Stephen
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Population genetics; land-use; amphibian evolutionary ecology; conservation; wetland ecology; management
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The Barn Group Land Trust
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TBG preserves, protects, and maintains streams, wetlands, and natural resources to increase stewardship and conservation for present and future generations.
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The Wetland Trust
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The Wetland Trust protects and restores wetlands and unique wetland biodiversity in New York with special interest in amphibians and reptiles (herpetofauna). The Trust presently owns 26 properties covering 1,600 wetland acres.
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U.S. Fish and Wildlife Service Announces Completion of National Wetlands Database and Interactive Mapping Tool
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To coincide with American Wetlands Month, which begins May 1, the U.S. Fish
and Wildlife Service is announcing the completion of the most comprehensive
and detailed U.S. wetland data set ever produced, capping a 35-year effort
by the Service to map the extent of the nation’s wetlands.
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USDA Invests $28 Million in New Projects to Help Restore Lost Wetland Functions, Benefits on Agricultural Landscapes
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WASHINGTON, March 15, 2021 – The U.S. Department of Agriculture (USDA) is investing $28 million in six new Wetland Reserve Enhancement Partnership (WREP) projects and four ongoing ones, which enable conservation partners and producers to work together to return critical wetland functions to agricultural landscapes. Partners will contribute $2.82 million, bringing the total investments to $30.82 million.
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Webinar on Wetland Restoration in Urban & Highly Disturbed Landscapes
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The Association of State Wetland Managers (ASWM) is pleased to invite you to attend the next webinar in our popular Improving Wetland Restoration Success webinar series on “Wetland Restoration in Urban and Highly Disturbed Landscapes.”
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Wetland Link International Webinar
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The Association of State Wetland Managers is a member of Ramsar U.S. As a member we have been working with Wetland Link International to provide an opportunity for wetland education and interpretive centers in North America to have a common venue for sharing information and collaborating on issues of common concern.
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Wetland restorations offer environmental, economic benefits
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Scientists with USDA’s Natural Resources Conservation Service recognize the environmental and economic benefits regional wetlands provide and the importance of preserving wetland resources.
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