Biomass allocation and productivity–richness relationship across four grassland types at the Qinghai Plateau

Aboveground biomass (AGB) and belowground biomass (BGB) allocation and productivity–richness relationship are controversial. Here, we assessed AGB and BGB allocation and the productivity–richness relationship at community level across four grassland types based on the biomass data collected from 80 sites across the Qinghai Plateau during 2011–2012. The reduced major axis regression and general linear models were used and showed that (1) the median values of AGB were significantly higher in alpine meadow than in other three grassland types; the ratio of root to shoot (R/S) was significantly higher in desert grassland (36.06) than intemperate grassland (16.60), alpine meadow (13.35) and meadow steppe (19.46). The temperate grassland had deeper root distribution than the other three grasslands, with about 91.45% roots distributed in the top 30 cm soil layer. (2) The slopes between log AGB and log BGB in the temperate grassland and meadow steppe were 1.09 and 1, respectively, whereas that i...

地上生物量（Aboveground biomass, AGB）与地下生物量（Belowground biomass, BGB）的分配模式及生产力-丰富度关系一直存在争议。本研究基于2011-2012年期间在青海高原（Qinghai Plateau）80个样点采集的生物量数据，评估了四种草地类型群落水平上AGB与BGB的分配特征及生产力-丰富度关系。通过约化主轴回归（reduced major axis regression）和一般线性模型（general linear models）分析发现：（1）高寒草甸（alpine meadow）的AGB中位数显著高于其他三种草地类型；荒漠草原（desert grassland）的根冠比（root-to-shoot ratio, R/S）显著高于温带草原（temperate grassland，16.60）、高寒草甸（13.35）和草甸草原（meadow steppe，19.46）；温带草原的根系分布深度大于其他三种草地，其约91.45%的根系集中在表层30厘米土壤中。（2）温带草原和草甸草原中log AGB与log BGB之间的斜率分别为1.09和1，而...