Perennial grass tiller and stolon counts in plots with experimentally altered precipitation variability at the Jornada Basin LTER site, 2012-2014

This dataset contains perennial grass tiller and stolon counts 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. Perennial grass tiller and stolon counts were made annually in each plot from 2012-2014. This is an ongoing study and the dataset will be updated as needed.本数据集收录了2012年起采集的多年生禾草分蘖数与匍匐茎数统计数据，相关实验为美国新墨西哥州南部乔纳达盆地长期生态研究站点（Jornada Basin LTER）开展的长期降水变异调控实验。本研究旨在评估降水年际变异对奇瓦瓦沙漠草原地上净初级生产力（ANPP, Aboveground Net Primary Productivity）的影响。实验始于2009年，共设置5种年度降水调控处理，包含50个样地（每种处理对应10个样地）。该实验通过降水遮蔽装置与灌溉处理，对荒漠草原内2.5米×2.5米的样地进行水分输入调控。实验设置了高变异、低变异与对照（自然降水）三种降水处理类型：对照样地每年接收自然降水；高变异处理组每年在自然降水量的20%与180%之间交替调控，低变异处理组则在50%与150%之间交替调控。2012年至2014年间，研究人员每年对每个样地内的多年生禾草分蘖数与匍匐茎数进行统计。本研究仍在持续进行中，数据集将根据实际需求适时更新。