Shrub encroachment alters topsoil C:N:P stoichiometric ratios in a high-altitude forest cutover
Shrub encroachment alters topsoil C:N:P stoichiometric ratios in a high-altitude forest cutover
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DOI：
10.3832/ifor2803-011
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发表时间：
2018-10-01
影响因子：
1.7
通讯作者：
Bao, Weikai
中科院分区：
文献类型：
--
作者：
Feng, Defeng;Bao, Weikai
灌木入侵对土壤碳(C)：氮(N)：磷(P)化学计量比的影响在很大程度上仍是未知的。研究了这种效应以及灌木大小对高海拔森林刈割的影响，选取了四种常见的灌木种：三角樱、冰川樱、欧梅樱和沙柳。草甸与灌丛岛表层土壤C:N差异受灌丛种类和植物大小的影响较大。不论灌木种类和植株大小，灌丛岛屿的表层土壤氮磷和碳磷比均高于草甸。灌木的扩张只增加了樱桃和玫瑰地下表层土壤的C:N，而增加了4种灌木地下表层土壤的N:P和C:P。随着灌木大小的增加，4种灌木的化学计量比的增加具有相同的规律。Ribes灌丛表层土壤C:P和N:P比值始终高于相同株型的其他灌丛。研究结果表明，灌丛岛对土壤C:N:P化学计量比的影响与灌丛种类和大小有关。本研究结果有助于澄清目前对土壤C:N:P化学计量学二次演替趋势的困惑。
The effect of shrub encroachment on soil carbon (C): nitrogen (N): phosphorus (P) stoichiometric ratios are largely still unknown. We investigated this effect and the effect of shrub size in a high altitude forest cutover among four common shrub species: Cerasus trichostoma, Ribes glaciate, Rosa omeiensis and Salix sphaeronymphe. The difference in topsoil C:N ratio between meadows and shrub islands was greatly influenced by shrub species and plant sizes. Topsoil N:P and C:P ratios were always higher in shrub islands than in meadows, irrespective of shrub species and plant size. The expansion of shrubs merely increased the topsoil C:N ratio beneath Cerasus and Rosa, and increased the topsoil N:P and C:P ratios beneath the four shrub species. The increase in stoichiometric ratio followed an identical pattern among the four shrub species as shrub size increased. There were always higher topsoil C:P and N:P ratios beneath Ribes than under the other shrub species with the same plant size. This study clearly suggests that the effect of shrub islands on soil C:N:P stoichiometric ratios was dependent on shrub species and size. Our results are conducive to clarifying the currently confusion in secondary successional trends of soil C:N:P stoichiometry.