Standing belowground plant biomass from the Jena Experiment (Main Experiment, year 2004)@en

This data set contains measurements of standing belowground plant biomass. Data presented here is 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 in general by bi-annual weeding and mowing. Since 2010, plots were weeded three times per year. […]本数据集收录了现存地下植物生物量（standing belowground plant biomass）的实测数据。本次发布的数据源自某大型草地生物多样性实验的主实验样地——耶拿实验（Jena Experiment），详细说明见下文。 该主实验共设置82块20×20米的草地样地，样地构建基于包含4个功能群（禾草、豆科植物、高大草本与小型草本）的60个物种种库。2002年5月，研究人员从该物种种库中选取不同数量的植物物种播种至各样地，以此构建植物物种丰富度（1、2、4、8、16及60种）与功能群丰富度（1、2、3、4个功能群）的梯度实验体系。 常规样地维护采用每年两次除草与刈割的管理模式；自2010年起，样地的除草频次调整为每年3次。[…]