【摘要】 调控岷江干旱河谷-山地森林交错带生态系统不仅具有遏止干旱河谷上延和扩展亚高山森林生态功能的重要作用,而且是"5.12"地震灾后恢复与重建的重要内容。为了解不同调控模式对交错带土壤养分特征的影响,基于该区"缺N少P"的现状,以调控18个月的4种典型调控模式为研究对象,比较分析了不同调控模式下土壤N和P的特征。各调控模式下土壤N和P含量及贮量无显著差异。相对于其他模式,以固N树种刺槐和固N草本紫花苜蓿为主体的调控模式具有相对较高的土壤NH4-N和速效P含量。同样的,以固N树种刺槐和速生树种墨西哥杨为主体的调控模式可以很好的组合,也表现出较高的土壤速效N和速效P含量。但是仅以速生树种为主体的调控模式可能有较高资源需求量并没有表现出较高的土壤速效N和速P含量。并且,不同调控模式下土壤N和P各组分比例也有所不同。这些结果为岷江干旱河谷-山地森林交错带的植被实践提供了一定的基础数据。更多还原

【Abstract】 The vegetation modification at the ecotone between arid valley and mountain forest plays an important role in stopping the expansion of dry valley and extending the ecological functions of subalpine forest,which is also the important content of rebuilding and restoration after "5·12" heavy earthquake.In order to understand the effects of modified mode on soil nutrient characters,the characteristics of soil N and P were investigated under four modification modes after 18 month modification.There were insignificant differences in the content and stock of soil N and P among the different modification modes.Compared with other modes,the modes with Robinia pseudoacacia and Medicago sativa,and with Robinia pseudoacacia and poplar showed relative higher content of NH4-N and available P.However,the mode dominated by fast-growing trees did not display higher content of available N and available P due to higher nutrient needs.Additionally,soil N and P pattern was different among the different modes.The results provided basic scientific data for vegetation practice at the ecotone between dry valley and mountain forest.更多还原