通过对贡嘎山典型天然林样地动态的调查和群落结构的研究，基本掌握了青藏高原东部亚高山森林植被的演替特征和过程，在自然生态竞争条件下，树木的种源通过扩散，就地下种和萌发新技产生的幼苗只有极少数能够生长成大树，在树木繁育过程中，光照，水分，温度和养分竞争是决定性条件，山地灾变干扰对森林的更新也具有重要作用，提出的贡嗄山森林演替模型（GFSM）在树木个体生命史模型的基础上重现了群落的演替动态，特别是将土壤形成与树木演变结合起来，采用随机过程模拟气候波动及单木生长死亡的不确定性，揭示了亚高山天然条件下的森林个体与群落的行动态，对于解决天然林更新与保护提供了系统的分析预测技术与理论。

The Gongga Mountain of eastern Tibet Plateau is representative of the alpine region with high peak and deep valleys． Climate change over the last thousand of years had controlled the dynamics of glacier and debris-flow bursting，which resulted in substantial changes in the mountainous environment．We surveyed community structure of primary forests in Gongga mountain and forest successional processes in wood plots．The changing features in sub-alpine environment are discussed in this paper． Tree species and size between glacial shrinking area and debris-flow fan in Hailuogou valley are com pared． The pioneer species that settle in debris—flow fan and glacial shrinking area are Salix spp．and Populus purdomii．Abiesbri and Picea brachytyla are the climax tree species，respectively． The prim ary vegetation successional process in Hailuogou (2700~ 3200m)can be divided into four stages：
Slash surface (20～ 200a)→Salix-Populus seeding community (1 0～ 30a)→Populus-Salix sapling community (3O～ 100a)→Populus→Abies mixed community (5O～ 100a)→Aies-Picea climax．
In a natural and undisturbed environment，trees com pete for light。water and nutrients，and therefore， only very few trees grow up and mature through spreading，seeding or sprouting．Disaster disturbances in mountain is an very im portant driving factor for regeneration of woody plants． Repeated destruction of forest by glacial movement or debris flow generated additional forest gaps that allow young plants to grows．In this study the Gongga Forest Succession M odel(GFSM )was developed for simulation of forest comm unity successional processes in different scale in Gongga M ountain． The GFSM is a modified version from the Newcop M odel that had been used in Northeastern China． A soil succession m odule was added in to the GFSM model tO sim ulate soil form ation and chemical element change of woodland． In order to represent major features of forests in Southwestern China，many field works have been done to identify ecological param eters of various trees in the sub-alpine region．