桤柏混交林幼林生长的灰色拓扑预测

A TOPOLOGICAL PREDICTION OF THE GROWTH OF YOUNG TREES IN MIXED ALDER AND CYPRESS FORESTS

应用灰色系统ＧＭ（１，１）模型及其改进模型研究了四川省盐亭县龙江４年来连续营造的桤柏混交林和柏木纯林，建立了混交林和柏木纯林中幼木生长的灰色ＧＭ（１，１）模型、新息ＧＭ（１．１）模型和ＧＭ（１，１）新陈代谢模型，结果表明，ＧＭ（１，１）新陈代谢模型能较好地摸拟和预测桤木和柏木在幼林期的生长状况，井对其随后６年的胸径、树高作了预测．由预测结果可以推断，桤柏混交林促进目的树种柏木生长的效益是非常明显的．

The essay describes the application of the grey system model(GM 1, 1)and its improvedversion to the study of the growth of mixed alder and cypress forests and that of pure cypress forests.Boththe mixed and the pure forests have been planted for four years in Longjiang Town,Yanting County,SichuanProvlnce.Based on the study the essay has established the Grey GM(1,1)model,the New Information GM(1,1) model and the Metabolism GM(1,1) model for the growth of young trees,The results show thatMetabolisni GM(1,1)model can better simulate and predict the growth conditions,the height and diameter atbreast height of alder and cypress in the following six years. The essay concludes that it is obvious that mixedalder and cypress forests can promote the growth of cypress.