黄土丘陵区县南沟流域农业产业-资源系统链网结构分析

针对黄土丘陵区农业产业—资源系统链网结构发生重要变化的现实，对县南沟流域退耕以来农业产业—资源系统链网结构变化过程以及演变路径进行了分析。结果表明:农业产业—资源系统链网结构变化过程可以划分为四个阶段:（I）生态系统修复阶段→（Ⅱ）经济系统（结构）适应阶段→（Ⅲ）农业产业—资源系统相悖阶段→（Ⅳ）农业产业—资源系统优化耦合阶段，系统已经经历了I、Ⅱ、Ⅲ阶段，现处于第Ⅲ阶段。在这个过程中农业资源系统得以恢复重建，农业产业系统结构逐渐调整，经济效益逐年上升，然而产业系统与资源系统并未达到协调发展状态，目前林草资源丰富且未得到合理、有效利用，因此需要进一步优化农业产业—资源耦合系统结构，以促进区域可持续发展。同时，还可以得出:农业产业—资源系统链网结构可通过资源环境、农业资源、农业产业、经济效益予以表征。

Agricultural Industry-Resource System Chain Network Structure of Xiannangou Watershed in Loess Hilly Region

Based on changes in chain network structure of agriculture industry-resources system in the Loess Hilly area, we analyzed the agricultural industry-resources system chain network structure change process and its evolution path in Xiannangou watershed. The results showed that the change process of agricultural industry-resources system chain network structure could be divided into four stages:ecosystem restoration, economic system architecture adaptation, contrary development and optimization coupling. The system had experienced the first three stages. In this process, the agricultural resources system had been reconstructed and the structure of agricultural industry system gradually had been adjusted, the economic benefits increased year after year. However, industrial systems and resource systems did not achieve the coordinated development by rationally and efficiently exploiting the abundant grass resources. Therefore, the structure of agricultural industry-resource coupling system must be optimized in order to promote regional sustainable development. At the same time, it can also be drawn that agricultural industry-resources system chain network structure can be characterized by environmental resources, agricultural resources, agricultural industrialization and economic table.