贡嘎山东坡亚高山林区土壤结构综合评价

Synthetical Evaluation of Soil Structure under Subalpine Forests on East Slope of Gongga Mountain

土壤结构状况对森林水文生态功能的发挥具有重要作用,以青藏高原东部、长江上游亚高山天然林区不同林型下土壤为研究对象,通过20个土壤结构指标的分析、计算,运用主成分-聚类分析方法综合评价了该区土壤结构。结果表明:20个土壤结构性评价常用指标所反映的信息有较大的重叠性,4个主成分表达了全部信息的90%以上,表现出土壤团聚体及稳定性、固相物质空间排列形成的孔隙、细粒物质等在土壤结构性能中具重要意义;林木生长的成熟化、混交或乔灌结合对土壤结构性能有较强促进作用。研究结果对于土壤结构综合评价方法选择、加强森林经营与培育以促进土壤结构发育、充分发挥森林水文生态效应具有一定的指导作用。

Soil structure is important to hydro-ecological function of forests. In this paper, basing on analysis and calculation of 20 soil structural indexes of soil samples from subalpine forests on east slope of Gongga Mountain, soil structure was synthetically evaluated using principal component analysis and clustering analysis. The results showed that： the information reflected by 20 structural indexes are highly over lapped, the 4 principal components expressed more than 90% of total information, and reflected the importance of aggregates and its stablity, soil pores, and granule material. Maturation of forest, mixed of arbor and arbor or arbor and shrub, are of importance to soil structure development. The results are of guidance for choosing soil structure synthetical evaluation methold, and strengthening forest managment to fully exert its hydro-ecological function.