Large-scale pattern of biomass partitioning across China's grasslands
Large-scale pattern of biomass partitioning across China's grasslands
复制标题
中国草原生物量大尺度分配格局
DOI：
10.1111/j.1466-8238.2009.00502.x
复制
发表时间：
2010-03-01
影响因子：
6.4
通讯作者：
Mohammat, Anwar
中科院分区：
文献类型：
--
作者：
Yang, Yuanhe;Fang, Jingyun;Mohammat, Anwar
目的研究草地生态系统地上和地下生物量分配的大尺度格局，并在群落水平上检验等距理论。在不同的草地类型跨越温带草原在干旱和半干旱地区的高寒草地在青藏高原。2001- 2005年，在中国北方地区进行了五次连续的草地生物量采样。然后，我们记录了根：冠比（R/S）及其与气候因子的关系，为中国的草地。我们进一步探讨了地上和地下生物量之间的关系，在不同的草原type.ResultsOur结果表明，中国的草原的整体R/S大于全球平均水平（6.3与3.7）。中国草地的R/S与年平均温度和年平均降水量之间没有显著的变化趋势。不同草地类型的地上生物量与地下生物量几乎成正比，其比例指数（地上生物量与地下生物量之间对数-对数线性关系的斜率）为1.02。坡度没有显着差异温带和高寒草原或草原和meadow.Main conclusionsOur研究结果支持地上和地下生物量分配的等距理论，并建议地上生物量尺度isometrically与地下生物量在社区水平。
AimTo investigate large-scale patterns of above-ground and below-ground biomass partitioning in grassland ecosystems and to test the isometric theory at the community level.LocationNorthern China, in diverse grassland types spanning temperate grasslands in arid and semi-arid regions to alpine grasslands on the Tibetan Plateau.MethodsWe investigated above-ground and below-ground biomass in China's grasslands by conducting five consecutive sampling campaigns across the northern part of the country during 2001-05. We then documented the root : shoot ratio (R/S) and its relationship with climatic factors for China's grasslands. We further explored relationships between above-ground and below-ground biomass across different grassland types.ResultsOur results indicated that the overall R/S of China's grasslands was larger than the global average (6.3 vs. 3.7). The R/S for China's grasslands did not show any significant trend with either mean annual temperature or mean annual precipitation. Above-ground biomass was nearly proportional to below-ground biomass with a scaling exponent (the slope of log-log linear relationship between above-ground and below-ground biomass) of 1.02 across various grassland types. The slope did not differ significantly between temperate and alpine grasslands or between steppe and meadow.Main conclusionsOur findings support the isometric theory of above-ground and below-ground biomass partitioning, and suggest that above-ground biomass scales isometrically with below-ground biomass at the community level.