由系统功能看蒋家沟荒漠化的发生与发展

在定量计算蒋家沟生态系统能量流和物质流的基础上,分析了系统的功能状况,结果表明该系统功能低下,对人畜数量的稳定支持能力校低,是一个掠夺型的农业生态系统。随系统中经济的发展,人畜超载,导致滥伐、滥垦、滥牧,森林植被遭到严重破坏,以泥石流过程为主的荒漠化得以发生和发展。

DISCUSSION ON ORIGINATION AND DEVELOPMENT OF DESERTIFICATION OF JIANGJIA RAVINE THROUGH THE STUDY ON ECOSYSTEM FUNCTION

Through the analysis of the function of agricultural ecosystem at Lumaoxiang, Dongchuan, in which Jiangjia Ravine is located,the energy flow and material flow are calculated and the condition of this ecosystem functions are analyzed in the paper. Features of Lumao agricultural ecosystem are that the scale and efficiency of its energy flow and material flow are low,primary production is the main part of the ecosystem production,natural ecosystem play an ! (?)mportant role in the development of Lumao ecosystem,its function is low,its potential population and livestock supporting capacity is also low. It is one kind of ecosystems which has the plunder feature. In the process of its economic development,population increases speedy,population and livestock are often over the supporting capacity of Lumao ecosystem so as to lead to excessive deforestion, cultivation and grazing,much area forest disappeared and the desertification process appeared and developed fast.