Total nitrogen from solid phase in the Jena Experiment (Main Experiment up to 30cm depth, year 2004)@en

This data set contains measurements of total nitrogen 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. […]本数据集包含大型草地生物多样性实验——耶拿实验（Jena Experiment）（详见下文）——主实验样地的总氮含量测定数据。该主实验共设置82块20×20米的草地样地，其构建基于涵盖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）的梯度序列。后续通过每年两次除草与刈割对样地进行管护。[…]