Carbon and nitrogen concentrations in plants (Main Experiment, year 2004)@en

This data set contains measurements of carbon and nitrogen concentrations in aboveground 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, plot size was reduced to 5 x 6 m and plots were weeded three times per year. […]本数据集包含植物地上生物量中的碳、氮浓度测定数据。本文所用数据源自一项大型草原生物多样性实验（耶拿实验（Jena Experiment）；详见下文）的主实验样地。该主实验共设置82块20×20米的草原样地，所用植物种源库包含60个物种，分属4个功能群（禾草类、豆科类、高大草本与小型草本）。2002年5月，研究人员从该种源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个物种）与功能群丰富度（1、2、3、4个功能群）的梯度系列。常规样地管护措施为每年两次除草与刈割。自2010年起，样地面积缩减至5×6米，且每年需除草三次。[…]