Plant species-level responses to functional group and species removals in biodiversity experiment plots at the Jornada Basin LTER site, 1999

This dataset contains individual species size data in vegetation plots that have had various plant functional groups or species experimentally removed at the Jornada Basin LTER site in southern New Mexico, USA. This data was collected with the objective to distinguish the differential effects of plant community biomass, functional groups, and biodiversity within functional groups on ecosystem and plant community function. To make these distinctions, treatments were established by the selective removal of plant species or functional groups within experimental plots. There are eight treatments: control (C, no removals); four functional group removal treatments (PG, perennial grass removed; S, shrubs removed; SSh, subshrubs removed; Succ, succulents removed), and three species richness manipulation treatments. Richness manipulations included a simplified treatment (Simp), where only the single most abundant species of each growth form is preserved and all other species in the growth form are removed, a reduced‐Larrea treatment (rL), where the Larrea is assumed to be the dominant and is removed while minority components remain, and a reduced-Prosopsis treatment (rP), where Prosopis rather than Larrea is removed as the shrub dominant. In 1999, this pilot study attempted to assess individual species responses of representative individuals in these treatments. Ten randomly selected individuals of eight plant species were measured in each experimental plot, and this dataset reports volumetric data (diameters and height) for each. The study was designed as an individual-based complement to the transect data in EDI dataset knb-lter-jrn.210121001 but was not continued past 1999. This dataset is complete.本数据集收录了美国新墨西哥州南部乔纳森盆地长期生态研究（Long-Term Ecological Research, LTER）站点内，经实验移除不同植物功能群或物种的植被样地中的物种个体尺寸数据。本数据集的采集目标为区分植物群落生物量、植物功能群以及功能群内生物多样性对生态系统及植物群落功能的差异化影响。为实现该研究目标，研究人员通过在实验样地中选择性移除特定植物物种或功能群来设置处理组。本次实验共设置8类处理：对照组（C，无任何移除操作）；4类功能群移除处理（PG：移除多年生草本；S：移除灌木；SSh：移除亚灌木；Succ：移除肉质植物）；以及3类物种丰富度调控处理。其中丰富度调控处理包括：简化处理（Simp），即仅保留每种生长型中丰度最高的单一物种，移除该生长型内其余所有物种；减少拉瑞阿属植物处理（rL），以拉瑞阿属植物为群落优势种并将其移除，保留其余伴生组分；减少牧豆树属植物处理（rP），以牧豆树属植物作为灌木优势种并将其移除，而非拉瑞阿属植物。1999年开展的本预实验，旨在评估各处理组中代表性植物个体的响应特征。每个实验样地内随机选取8种植物各10个个体进行测量，本数据集收录了各被测个体的体积相关参数（直径与株高）。本研究作为EDI数据集knb-lter-jrn.210121001中样带数据的个体尺度补充研究，仅在1999年实施，未延续至后续年份，本数据集完整无缺失。