Plant height along the plant diversity gradient in the Jena Experiment (Main Experiment, year 2006)

This data set contains measurements of plant height: vegetative height (heighest leaf) and regenerative height (heighest flower) in 2006 from the Main Experiment plots of a large grassland biodiversity experiment (the Jena Experiment; see further details below). In the Main Experiment, 82 grassland plots of 20 x 20 m were established from a pool of 60 species belonging to four functional groups (grasses, legumes, tall and small herbs). In May 2002, varying numbers of plant species from this species pool were sown into the plots to create a gradient of plant species richness (1, 2, 4, 8, 16 and 60 species) and functional richness (1, 2, 3, 4 functional groups). Plots were maintained by bi-annual weeding and mowing.
In 2006, plant height was recorded twice a year just before biomass harvest (during peak standing biomass in late May and in late August). For target plant individuals at 10 points separated by 1 m each along a transect in the central area in the plots, vegetative height (heighest leaf) and regenerative height (heighest flower) were measured as standing height (without stretching the plant). In 2006, also the plots of the management experiment, that altered mowing frequency and fertilized subplots (see further details below) were sampled by measuring vegatation height five times, every 1m on a 5m transekt along the side of the management plots. Provided are the individual measurements and the mean over the measured plants.

本数据集收录了2006年大型草地生物多样性实验（耶拿实验（Jena Experiment），详见下文）主实验样地的植物高度测量数据，涵盖营养高度（最高叶片高度）与生殖高度（最高花茎高度）两项指标。主实验共设置82块20×20米的草地样地，所用植物均取自包含4个功能群（禾草类、豆科类、高大草本与小型草本）的60个物种组成的物种库。2002年5月，研究人员从该物种库中选取不同数量的植物物种播种至各块样地，以构建植物物种丰富度（1、2、4、8、16和60种）与功能群丰富度（1、2、3、4个功能群）的梯度序列。样地通过每年两次除草与刈割进行维护。
2006年，研究人员于每年生物量收获前（5月末与8月末的生物量峰值期）开展两次植物高度测量。针对样地中心区域一条间隔1米布设的10个测点样带上的目标植物个体，测量其直立状态下的营养高度（最高叶片）与生殖高度（最高花茎），测量过程中不牵拉植株。同年，研究人员同时对管理实验样地进行了采样：该实验通过调整刈割频率并对亚样地施加施肥处理（详见下文），研究人员沿管理样地侧边的5米样带，每1米设置一个测点，共计五次测量植被高度。本数据集包含单株测量数据以及所有被测植株的平均高度值。