Environmental factors covary with plant diversity-productivity relationships among Chinese grassland sites
Environmental factors covary with plant diversity-productivity relationships among Chinese grassland sites
复制标题
环境因素与中国草地植物多样性-生产力关系相关。
DOI：
10.1111/j.1466-8238.2009.00508.x
复制
发表时间：
2010-03-01
影响因子：
6.4
通讯作者：
Schmid, Bernhard
中科院分区：
文献类型：
--
作者：
Ma, Wenhong;He, Jin-Sheng;Schmid, Bernhard
目的研究不同空间尺度下植物物种丰富度（SR）与地上净初级生产力（ANPP）之间的一般关系以及环境对这种关系的影响。中国的温带和高山草原。方法在中国温带和高寒草原广泛分布的321个样地（1355个样方）调查SR和ANPP。普通最小二乘（OLS）回归被用来测试SR-ANPP之间的关系网站的手段。利用一般线性模型（GLM）对样地水平的SR和ANPP数据进行分析，并将SR和ANPP的相关性分解为协方差分量，以检验气候变量、区域、植被类型和站点间剩余变异对SR和ANPP及其关系的影响。结果在高寒草原区和温带草原区，以及不同植被类型的草地群落中，SR和ANPP之间均存在线性正相关关系。环境梯度，如生长季降水影响SR和ANPP平行。然而，在删除的土壤-站点环境的变化，剩余SR和ANPP不再相关的合并内网站的水平。主要结论在大尺度的环境梯度站点之间的正SR-ANPP关系是最有可能的结果，气候变量影响SR和ANPP平行。我们的研究结果表明，在中国的天然草原有SR和ANPP之间没有直接的关系，大概是因为当地社区大会的可用物种池是大的，在实验中，物种池是人为减少。
Aim Our objective was to document the general relationship between plant species richness (SR) and above-ground net primary productivity (ANPP) at different spatial scales and the environmental influence on this relationship. Location Temperate and alpine grasslands of China. Methods We investigated SR and ANPP at 321 field sites (1355 plots) across the widely distributed temperate and alpine grasslands of China. Ordinary least squares (OLS) regressions were used to test SR-ANPP relationships among site means. Plot-level data of SR and ANPP were analysed with general linear models (GLMs) and the correlation between SR and ANPP was decomposed into covariance components to test the influence of climatic variables, region, vegetation type and remaining variation among sites on SR, ANPP and their relationship. Results We found positive linear relationships between SR and ANPP among sites in both the alpine and temperate grassland regions and in different grassland vegetation types of these biomes. Environmental gradients such as growing-season precipitation affected both SR and ANPP in parallel. However, after removing the among-site environmental variation, residual SR and ANPP were no longer correlated at the pooled within-site level. Main conclusions The positive SR-ANPP relationship across large-scale environmental gradients among sites was most likely the result of climatic variables influencing SR and ANPP in parallel. Our results suggest that in China's natural grasslands there is no direct relationship between SR and ANPP, presumably because the pool of available species for local community assembly is large, in contrast to experiments where species pools are artificially reduced.