农作制度对江河源区域生态环境演变的作用机理

农业生产活动是人类对区域生态环境的演变影响最为深远的人文因素之一，系统研究了农业在不同发展阶段的技术措施，提出了农作制度是农业生产干扰环境演变的主要因素，系统论述撂荒制、休闲制、轮作制、集约制4种农作制度在区域生态环境演变中的作用机理，并对不同阶段农作制度对江河源区生态环境演变作用程度进行比较和分析。

The Evolvement Mechanism of Ecological Environment in Source Region of Yangtse Rive, Huanghe River and Lantsang Under the Influence of the Farming System

The agricultural activity is one of the most important human factors that affect the evolvement of regional ecological environment, in the papers the technological measures during the course of developing of agriculture are studied systemic, the point that farming system is the main factor of agricultural activity influence the evolvement of regional ecological environment is put forward to, the evolvement mechanism of the wasteland system, fallowing system, rotation system, intensive cultivation to ecological environment in Source region of Yangtse Rive, Huanghe River and Lantsang is discussed systemic, and the degree of the farming system to evolvement of ecological environment in different stages is compared and analysed.