农牧交错带农业生态服务功能的作用及其保护途径

目前全球农业生产覆盖全球25％～30％的土地面积，约50％的可利用土地已经被农业占据。如果农业生态系统．特别是生态脆弱区的系统服务功能得不到恢复与保护．那将会拖全球环境保护的“后腿”。由于中国的国情决定了在生态脆弱区环境保护中必须坚持环境保护与发展农业生产“两手抓“。因此．农业生态系统服务功能的恢复、维持应该成为该地区生态环境保护与建设的重要组成部分。农业生产不仅要提高生态系统服务的产品功能，更要恢复和维持其各种维持生命的间接服务功能。本文在分析农业生态系统服务功能退化表现与影响因素的基础上．提出了针对各项服务功能的恢复与维持对策。

Functions and Conservation Approach of Agroecosystem Services for Fragile Econtone of Agriculture and Husbandry

On our planet, 25% - 30% of land areas have been covered by agricultural production; about 50% of useable land is occupied by agriculture. Global environment conservation would lag behind if the regressive ecological functions of agroecosystem can not be restored or protetted, especially in fragile agroecosystem. In China, particularly in ecotone, it is necessary for the nation and local area to develop agricultural production, and simultaneously undertake environmental construction. Therefore, maintaining and restoring the ecological functions of agroecosytem services are the key to global environmental conservation and it should be considered as an important component of global environmental conservation. Agricultural production should not only improve production services of agroecosystem, but also restore or maintain its indirect services. Based on the analysis of the regressive performance and affected factors of fragile agroecosystem, we put forward many and technologies for restoring and maintaining every services for the fragile agroecosystem.