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1. Total Annual Aboveground Net Primary Productivity across grassland-shrubland ecotones at 3 sites in the Jornada Basin, 2006-ongoing

   https://doi.org/10.6073/pasta/88a29965fb635be5a79a89b4e1416c00  

   Bestelmeyer, Brandon T; Schooley, Robert (January 2024, Environmental Data Initiative)

   The objective of this ongoing study is to investigate how pulses of precipitation translate into pulses of plant aboveground net primary productivity (NPP) across grassland to shrubland ecotones in the northern Chihuahuan Desert. This dataset consists of annual aboveground net primary productivity estimates in three habitat vegetation zones (grassland, ecotone, and shrubland) at three grassland-to-shrubland ecotone sites in the Jornada Basin, Dona Ana County, New Mexico, USA. The annual ANPP estimates are derived from plant cover measurements (see methods). Due to its growth form, Yucca elata (YUEL) has been found to produce large errors in interyear biomass estimates. This data package contains annual ANPP estimates both with and without YUEL, but the authors strongly recommend using the non-YUEL estimates for most purposes. Data collection is ongoing with new observations in spring and fall of each year; data from both annual sampling times are required to estimate annual ANPP. 

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2. Spring and Fall plant cover across grassland-shrubland ecotones at 3 sites in the Jornada Basin, 2005-ongoing

   https://doi.org/10.6073/pasta/13a6e606f3173f5b39cca500ad65fb97  

   Bestelmeyer, Brandon T; Schooley, Robert (January 2024, Environmental Data Initiative)

   The objective of this ongoing study is to investigate how pulses of precipitation translate into pulses of plant aboveground net primary productivity (ANPP) across grassland to shrubland ecotones in the northern Chihuahuan Desert. This dataset consists of ocular plant cover and height measurements to be used for estimating aboveground net primary in three habitat vegetation zones (grassland, ecotone, and shrubland) at three grassland-to-shrubland ecotone sites in the Jornada Basin, Dona Ana County, New Mexico, USA. Sampling is conducted twice a year: in the spring before the growing season and in the fall after the growing season. 

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3. Monsoon Rainfall Manipulation Experiment (MRME): Net Primary Production Quadrat Data at the Sevilleta National Wildlife Refuge, New Mexico

   https://doi.org/10.6073/pasta/b249097975dcd58ea2470854d5409f42  

   Baur, Lauren; Collins, Scott; Muldavin, Esteban; Rudgers, Jennifer A; Pockman, William T. (January 2021, Environmental Data Initiative)

   {"Abstract":["The Monsoon Rainfall Manipulation Experiment (MRME) is to understand\n changes in ecosystem structure and function of a semiarid grassland\n caused by increased precipitation variability, which alters the\n pulses of soil moisture that drive primary productivity, community\n composition, and ecosystem functioning. The overarching hypothesis\n being tested is that changes in event size and variability will\n alter grassland productivity, ecosystem processes, and plant\n community dynamics. In particular, we predict that many small events\n will increase soil CO2 effluxes by stimulating microbial processes\n but not plant growth, whereas a small number of large events will\n increase aboveground net primary production (ANPP) and soil\n respiration by providing sufficient deep soil moisture to sustain\n plant growth for longer periods of time during the summer monsoon.\n To measure ANPP (i.e., the change in plant biomass, represented by\n stems, flowers, fruit and foliage, over time), the vegetation\n variables in this dataset, including species composition and the\n cover and height of individuals, are sampled twice yearly (spring\n and fall) at permanent 1m x 1m plots. The data from these plots is\n used to build regressions correlating biomass and volume via weights\n of select harvested species obtained in SEV157, "Net Primary\n Productivity (NPP) Weight Data." This biomass data is included\n in SEV206, "Seasonal Biomass and Seasonal and Annual NPP for\n the Monsoon (MRME) Study.""]} 

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4. Aboveground vegetation cover and biomass in plots with experimentally altered precipitation variability at the Jornada Basin LTER site, 2009-ongoing

   https://doi.org/10.6073/pasta/a53cdb89c03c3896eb61b64adc25f344  

   Gherardi, Laureano; Sala, Osvaldo E (January 2023, Environmental Data Initiative)

   This dataset contains cover and biomass data collected starting in 2012 for a long-term precipitation variability manipulation experiment at the Jornada Basin LTER site in southern New Mexico, U.S.A. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009, has five annual precipitation treatments, and contains 50 plots (10 per treatment). This experiment uses precipitation shelters and irrigation treatments to manipulate water inputs to 2.5 x 2.5 meter plots in a desert grassland. There are high, low, and ambient (control) precipitation variability treatments. Ambient plots receive natural precipitation each year, while variability treatments alternate between 20% and 180% (high variability), or 50% and 150% (low variability) of ambient precipitation each year. Plant cover measurements are made annually in each plot, from which biomass or net primary production are derived. This is an ongoing study and the dataset will be updated yearly. 

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5. Core Research Site Web Seasonal Biomass and Seasonal and Annual NPP Data for the Net Primary Production Study at the Sevilleta National Wildlife Refuge, New Mexico

   https://doi.org/10.6073/pasta/5d6fa085c3d31bc1bc352081ec9e839a  

   Baur, Lauren; Collins, Scott; Muldavin, Esteban; Rudgers, Jennifer A; Pockman, William T. (January 2021, Environmental Data Initiative)

   {"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.""]} 

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