PRELIMINARY STUDY ON ECOLOGICAL SPECIES GROUPS IN XUNHE RIVER BASIN, SOUTH FACE OF QINLING MOUNTAIN
秦岭南坡旬河流域森林植被生态种组的初步研究

Using topographical elevation, pH value and humus content in surface soil as environmental gradient indices, this paper has statistically analyzed field investigation data of forest vegetation in Xunhe River basin and its adjacent area, south aspect of Qinling Mountain, to differentiate forest habitat. 9 habitat types (sites) has been classified in the area by means of principal components analysis (PCA) and discriminant analysis (DA). On the basis of those 9 habitat types, 31 species with environmentally indicative significance have been selected out of all the undergrowth species in quadrats of every type according to species' present-absent and coverage index. 9 ecological species groups corresponding to 9 types respectively have been established through repeated adjustment process. The indicative amplitude of each group on habitat types has also been reviewed to help distinguish different sites in fieldwork of productional or management parposes.