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

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.

本数据集收录了2012年起，在美国新墨西哥州南部霍罗纳盆地长期生态研究（Long-Term Ecological Research, LTER）站点开展的长期降水变异调控实验所获取的植被盖度与生物量数据。本实验旨在探究降水年际变异对奇瓦瓦荒漠草原平均地上净初级生产力（aboveground net primary productivity, ANPP）的影响。该实验于2009年启动，设置5种年度降水调控处理，共包含50个样地（每种处理对应10个样地）。本实验通过降水遮蔽棚与灌溉调控处理，对荒漠草原内2.5×2.5米的样地进行水分输入量调控。实验设置高变异、低变异以及自然（对照）三种降水变异处理：自然（对照）样地每年接收天然降水；变异处理组则每年在自然降水水平的20%与180%之间交替（高变异组），或在50%与150%之间交替（低变异组）。每个样地每年开展植被盖度测量，并由此推算生物量或净初级生产力。本实验仍在持续进行，数据集将按年度更新。