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{"Abstract":["Begun in spring 2013, this project is part of a long-term study at\n the Sevilleta LTER measuring net primary production (NPP) across\n three distinct ecosystems: creosote-dominant shrubland (Site C),\n black grama-dominant grassland (Site G), and blue grama-dominant\n grassland (Site B). 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. Above-ground net primary\n production is the change in plant biomass, represented by stems,\n flowers, fruit and foliage, over time and incorporates growth as\n well as loss to death and decomposition. To measure this change the\n vegetation variables in this dataset, including species composition\n and the cover and height of individuals, are sampled twice yearly\n (spring and fall) at permanent 1m x 1m plots within each site. A\n third sampling at Site C is performed in the winter. The data from\n these plots is used to build regressions correlating biomass and\n volume via weights of select harvested species obtained in SEV999,\n "Net Primary Productivity (NPP) Weight Data." This biomass\n data is included in SEV999, "Seasonal Biomass and Seasonal and\n Annual NPP for Core Grid Research Sites.""]}
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Plant Removal Study: Recovery of Vegetation Following Disturbance at the Sevilleta National Wildlife Refuge, New Mexico
In 1995, a removal study was initiated at the Sevilleta LTER to examine the response of vegetation following the removal of dominant species. Five sites were selected that were dominated by either blue grama (site 1), blue and black grama (site 2), black grama (site 3), black grama and creosote (site 4), or creosote (site 5). A sixth site was later added in the blue grama community along the foothills of the Los Pinos Mountains (site 6). At sites 1, 3, 5, and 6, five 3m x 4m plots had all plants of the dominant species removed; five 3m x 4m plots were controls. At site 2, 5 plots had blue grama removed, 5 plots had black grama removed, and 5 plots were controls. At site 4, 5 plots had black grama removed, 5 plots had creosote removed, and 5 plots were controls. Initial cover prior to removal was estimated by species for each plot. Grass was removed using a shovel to collect above-ground biomass and crowns just below the soil surface. Shrubs were removed using large clippers to collect above-ground biomass to the soil surface. All biomass removed was bagged, dried, and weighed. Plot maintenance or removal of the target dominant species is performed annually or as needed. Rain gauges were installed at each site and the corners of the areas containing each set of plots GPS'd. Plot corners are marked by nails and are flagged periodically to aid identification and minimize foot traffic in the plots. Each northeast nail has a metal tag with site and plot number on it. Erosion bridges (1 m long) were installed in plots 1, 3 and 5 (removals and controls) at sites 1-5. Initial measurements were made in 1996.
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- Award ID(s):
- 1655499
- PAR ID:
- 10424125
- Publisher / Repository:
- Environmental Data Initiative
- Date Published:
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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{"Abstract":["This dataset is part of a long-term study at the Sevilleta LTER\n measuring net primary production (NPP) across four distinct\n ecosystems: creosote-dominant shrubland (Site C, est. winter 1999),\n black grama-dominant grassland (Site G, est. winter 1999), blue\n grama-dominant grassland (Site B, est. winter 2002), and\n pinon-juniper woodland (Site P, est. winter 2003). 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. Above-ground net primary production is the change in\n plant biomass, represented by stems, flowers, fruit and and foliage,\n over time and incoporates growth as well as loss to death and\n decomposition. To measure this change the vegetation variables in\n this dataset, including species composition and the cover and height\n of individuals, are sampled twice yearly (spring and fall) at\n permanent 1m x 1m plots within each site. A third sampling at Site C\n is performed in the winter. The data from these plots is used to\n build regressions correlating biomass and volume via weights of\n select harvested species obtained in SEV157, "Net Primary\n Productivity (NPP) Weight Data." This biomass data is included\n in SEV182, "Seasonal Biomass and Seasonal and Annual NPP for\n Core Research Sites." This dataset is designated as NA-US-011\n in the Global Index of Vegetation-Plot Databases (GIVD). To aid\n tracking of the use of databases in this index, please also\n reference this number when citing this data. The GIVD report for\n SEV129 can be found in: Biodiversity and Ecology 4 - Vegetation\n Databases for the 21st Century (2012) by J. Dengler et al."]}more » « less
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{"Abstract":["This dataset contains pinon-juniper woodland quadrat data and is\n part of a long-term study at the Sevilleta LTER measuring net\n primary production (NPP) across four distinct ecosystems:\n creosote-dominant shrubland (Site C, est. winter 1999), black\n grama-dominant grassland (Site G, est. winter 1999), blue\n grama-dominant grassland (Site B, est. winter 2002), and\n pinon-juniper woodland (Site P, est. winter 2003). 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. Above-ground net primary production is the change in\n plant biomass, represented by stems, flowers, fruit and and foliage,\n over time and incorporates growth as well as loss to death and\n decomposition. To measure this change the vegetation variables in\n this dataset, including species composition and the cover and height\n of individuals, are sampled twice yearly (spring and fall) at\n permanent 1m x 1m plots within each site. A third sampling at Site C\n is performed in the winter. The data from these plots is used to\n build regressions correlating biomass and volume via weights of\n select harvested species obtained in SEV157, "Net Primary\n Productivity (NPP) Weight Data." This biomass data is included\n in SEV182, "Seasonal Biomass and Seasonal and Annual NPP for\n Core Research Sites.""]}more » « less
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{"Abstract":["This dataset contains pinon-juniper woodland biomass data and is\n part of a long-term study at the Sevilleta LTER measuring net\n primary production (NPP) across four distinct ecosystems:\n creosote-dominant shrubland (Site C, est. winter 1999), black\n grama-dominant grassland (Site G, est. winter 1999), blue\n grama-dominant grassland (Site B, est. winter 2002), and\n pinon-juniper woodland (Site P, est. winter 2003). 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. Above-ground net primary production is the change in\n plant biomass, represented by stems, flowers, fruit and and foliage,\n over time and incoporates growth as well as loss to death and\n decomposition. To measure this change the vegetation variables in\n this dataset, including species composition and the cover and height\n of individuals, are sampled twice yearly (spring and fall) at\n permanent 1m x 1m plots within each site. A third sampling at Site C\n is performed in the winter. Volumetric measurements are made using\n vegetation data from permanent plots (SEV278, "Pinon-Juniper\n (Core Site) Quadrat Data for the Net Primary Production Study")\n and regressions correlating species biomass and volume constructed\n using seasonal harvest weights from SEV157, "Net Primary\n Productivity (NPP) Weight Data.""]}more » « less
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