黄土丘陵区纸坊沟流域农业生态经济系统耦合过程分析

农业生态经济系统耦合指农业生态系统与农业经济系统按照其固有的互动关系，在人类适当干预和调控下所形成的有机统一体，其耦合态势可以依据农业资源与农业产业之间的循环链网结构予以表示.纸坊沟流域农业生态经济系统经历了“系统耦合→系统相悖→系统耦合→高层次上系统局部相悖”的过程，流域中农民的需求、国家宏观政策、经济手段和行政手段对农业生态经济系统耦合态势的调控和干扰是引起这一变化的主要因素.针对纸坊沟流域农业生态经济系统耦合过程中存在的问题，今后应建立以林草及其相关产业为中心的耦合体，建设农业生态经济系统优化耦合模式.

Agricultural eco-economic system coupling in Zhifanggou watershed in hilly-gully region of Loess Plateau

Agricultural eco-economic system coupling is an organic unit formed by the inherent interaction between agricultural ecosystem and economic system,and regulated and controlled by mankind moderate interference.Its status can be expressed by the circular chain-net structure of agricuhural resources and agricultural industry.The agricultural eco-economic system in Zhifanggou watershed has gone through the process of system coupling,system conflict,system coupling,and partial conflict in high leverage,which is caused by the farmers' requirement and the state's macro-policy,economic means,and administrative means.To cope with the problems of agricultural eco-economics system coupling in Zhifanggou watershed,the optimal coupling model should be established,with tree-grass resources and related industries as the core.