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{"Abstract":["Begun in spring 2004, this long-term study at the Sevilleta LTER\n examines how fertilization affects above-ground biomass production\n (ANPP) in a mixed desert-grassland. Net primary production is a\n fundamental ecological variable that quantifies rates of carbon\n consumption and fixation. Estimates of NPP are important in\n understanding energy flow at a community level as well as spatial\n and temporal responses to a range of ecological processes. While\n measures of both below- and above-ground biomass are important in\n estimating total NPP, this study focuses on above-ground net primary\n production (ANPP). Above-ground net primary production is the change\n in plant biomass, including loss to death and decomposition, over a\n given period of time. Volumetric measurements are made using\n vegetation data from permanent plots (SEV155, "Nitrogen\n Fertilization Experiment (NFert): Net Primary Production Quadrat\n Data") and regressions correlating species biomass and volume\n constructed using seasonal harvest weights from SEV157, "Net\n Primary Productivity (NPP) Weight Data." This site was burned\n by a prescribed fire in 2003."]}
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Warming-El Nino-Nitrogen Deposition Experiment (WENNDEx): Seasonal Biomass and Seasonal and Annual NPP at the Sevilleta National Wildlife Refuge, New Mexico
{"Abstract":["Begun in winter 2006, this long-term study at the Sevilleta LTER\n examines how heightened winter precipitation, N addition, and warmer\n nighttime temperatures affect above-ground biomass production (ANPP)\n in a mixed desert-grassland. Net primary production is a fundamental\n ecological variable that quantifies rates of carbon consumption and\n fixation. Estimates of NPP are important in understanding energy\n flow at a community level as well as spatial and temporal responses\n to a range of ecological processes. While measures of both below-\n and above-ground biomass are important in estimating total NPP, this\n study focuses on above-ground net primary production (ANPP).\n Above-ground net primary production is the change in plant biomass,\n including loss to death and decomposition, over a given period of\n time. Volumetric measurements are made using vegetation data from\n permanent plots (SEV176, "Warming-El Nino-Nitrogen Deposition\n Experiment (WENNDEx): Net Primary Production Quadrat Data") and\n regressions correlating species biomass and volume constructed using\n seasonal harvest weights from SEV157, "Net Primary Productivity\n (NPP) Weight Data.""]}
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- PAR ID:
- 10424116
- Publisher / Repository:
- Environmental Data Initiative
- Date Published:
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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{"Abstract":["This long-term study at the Sevilleta LTER measures net primary\n production (NPP) across four distinct ecosystems: creosote-dominant\n shrubland (Site C, est. winter 1999), black grama-dominant grassland\n (Site G, est. winter 1999), blue grama-dominant grassland (Site B,\n est. winter 2002), and pinon-juniper woodland (Site P, est. winter\n 2003), which is now in its own dataset, SEV278 (Pinon-Juniper (Core\n Site) Quadrat Data). Net primary production is a fundamental\n ecological variable that quantifies rates of carbon consumption and\n fixation. Estimates of NPP are important in understanding energy\n flow at a community level as well as spatial and temporal responses\n to a range of ecological processes. While measures of both below-\n and above-ground biomass are important in estimating total NPP, this\n study focuses on above-ground net primary production (ANPP).\n Above-ground net primary production is the change in plant biomass,\n including loss to death and decomposition, over a given period of\n time. Volumetric measurements are made using vegetation data from\n permanent plots collected in SEV129, "Core Research Site Web\n Quadrat Data" and regressions correlating biomass and volume\n constructed using seasonal harvest weights from SEV157, "Net\n Primary Productivity (NPP) Weight Data.""]}more » « less
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{"Abstract":["Begun in fall 2006, this long-term study at the Sevilleta LTER\n examines changes in net primary production (NPP) caused by increased\n precipitation variability within a semiarid grassland. Net primary\n production is a fundamental ecological variable that quantifies\n rates of carbon consumption and fixation. Estimates of NPP are\n important in understanding energy flow at a community level as well\n as spatial and temporal responses to a range of ecological\n processes. While measures of both below- and above-ground biomass\n are important in estimating total NPP, this study focuses on\n above-ground net primary production (ANPP). Above-ground net primary\n production is the change in plant biomass, including loss to death\n and decomposition, over a given period of time. Volumetric\n measurements are made using vegetation data from permanent plots\n (SEV188, "Monsoon Rainfall Manipulation Experiment (MRME): Net\n Primary Production Quadrat Data") and regressions correlating\n species biomass and volume constructed using seasonal harvest\n weights from SEV157, "Net Primary Productivity (NPP) Weight\n Data.""]}more » « less
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{"Abstract":["Net primary production is a fundamental ecological variable that\n quantifies rates of carbon consumption and fixation. Estimates of\n NPP are important in understanding energy flow at a community level\n as well as spatial and temporal responses to a range of ecological\n processes. While measures of both below- and above-ground biomass\n are important in estimating total NPP, this study focuses on\n above-ground net primary production (ANPP). Above-ground net primary\n production is the change in plant biomass, including loss to death\n and decomposition, over a given period of time. Volumetric\n measurements are made using vegetation data from permanent plots\n collected in SEV297, "Extreme Drought in Grassland Ecosystems\n (EDGE) Net Primary Production Quadrat Data" and regressions\n correlating biomass and volume constructed using seasonal harvest\n weights from SEV157, "Net Primary Productivity (NPP) Weight\n Data.""]}more » « less
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{"Abstract":["In 2003, the U.S. Fish and Wildlife Service conducted a prescribed\n burn over a large part of the northeastern corner of the Sevilleta\n NWR. This study was designed to look at the effect of fire on\n above-ground net primary productivity (ANPP) within different\n vegetation types. Net primary production (NPP) is a fundamental\n ecological variable that measures rates of carbon consumption and\n fixation. Estimates of NPP are important in understanding energy\n flow at a community level as well as spatial and temporal responses\n to a range of ecological processes. While measures of both below-\n and above-ground biomass are important in estimating total NPP, this\n study focuses on above-ground net primary production (ANPP).\n Above-ground net primary production (ANPP) is equal to the change in\n plant mass, including loss to death and decomposition, over a given\n period of time. To measure this change, ANPP is sampled twice a year\n (spring and fall) for all species in each of three vegetation types.\n In addition, volumetric measurements are obtained from adjacent\n areas to build regressions correlating biomass and volume. Three\n vegetation types were chosen for this study: mixed grass (MG), mixed\n shrub (MS) and black grama (G). Forty permanent 1m x 1m plots were\n installed in both burned and unburned sections of each habitat type.\n The core black grama site included in SEV129 was incorporated into\n this dataset as an unburned control, so an additional unburned G\n site was not created. The data for this site is noted as site=G and\n treatment=C (i.e., control). The original mixed-grass unburned plot\n caught fire unexpectedly in the fall of 2009 and was subsequently\n moved to the south. Volumetric measurements are made using\n vegetation data from permanent plots collected in SEV156, "Burn\n Study Sites Quadrat Data for the Net Primary Production Study"\n and regressions correlating biomass and volume constructed using\n seasonal harvest weights from SEV157, "Net Primary Productivity\n (NPP) Weight Data.""]}more » « less
