云南五大流域生态环境类型区划分

云南省防护林工程区地处伊洛瓦底江、怒江、澜沧江、红河、珠江五大流域上、中游，为了揭示地域上的相似性与差异性，分析其林业生态建设条件的异同，进行了该五大河流流域生态类型区划分。区划指标选择“土壤侵蚀量”、“坡度级”等若干直接因子以及“输沙模数”等若干间接因子，区划方法为非严格系统聚类方法，对流域项目区划分为三个生态环境等级类型区。并进行了生态重要性等级划分。

Division for Types of Ecological Environment of Five Big Watersheds in Yunnan

Protection Forest Engineering Areas of Yunnan province are located in up and middle reaches of five big watersheds, namely Yirouwadi River, Nujiang River, Lancangjiang River, Honghe River and Zhujiang River. To identify the regional similarity and difference, and to analyze the common & different condition for forest ecological construction, the zones for ecological type of these five big watersheds are classified. Direct factors for division such as the amount of soil erosion, class of gradient and so on, indirect factor and mathematics model of sediment discharge are chosen as division criteria. The division method adopted is non-strict systematic cluster analysis, three zones for ecological environment type and ecological significance rank have been divided in the project area.