陕西省长江流域生态地貌功能分区与评价

THE FUNCTIONAL DIVISION OF ECO-LANDFORM FOR THE YANGTZE RIVER VALLEY OF SOUTHERN SHAANXI AND ITS EVALUATION

采用１０个主要生物气候指标，结合地形地貌及相应的地带性植被和地带性土壤，对陕西省长江流域３１个县（市）进行动态聚类综合分析，本区可归并为２个森林植物气候带，５个生态地貌功能区。即：低山丘陵区北亚热带常绿落叶阔叶林生物气侯区，包括安康盆地、汉中盆地；热暖温带针阔混交林、针叶林生物气候区；包括秦岭南坡东部中山、低山区，秦岭南坡中、西部中、高山区和巴山北坡中山、低山。各生态地貌功能区的生物气候特征明显，符合林业生产及气候、植被、土壤条件的客观分布规律，可作为我省长江流域林业发展战略与布局的基础和指南．

By using 10 major bio-climate indexes and landforms with associated vegetation and soil, 31 counties in the Yangtze River Valley of Shaanxi were clustered into 2 forest phyto-climate zones and 5 eco-landform functional divisions: low mountains and hills region under north subtropical climate with evergreen and deciduous broadleaved forests bioclimate division; Ankang and Hanzhong basin ,the southern slope of eastern Qinling mountain range middle and low mountains region under hot - warm temperate climate with conifers and broadleaves mixtures and coniferous forests bio-climate division,the southern slope of mid and western Qinling mountain range middle and high mountains under warm temperate climate with conifers and broadleaves mixtures and coniferous forests bio-climate division and the northern slope of Dabashan mountain range middle and low mountain region under hot- warm temperate climate with conifers and broadleaved mixed forests bio- climate division. The 5 eco- landform functional divisions hold obviously distingLlished bioclimate features, coincide with the natural distribution regularities of the climate, vegetation.soil condition and forestry production actuality.