The radical reason of lower ecosystem productivity and disharmonic developing in this ecotone is the improper configuration inner animal husbandry for example of ansai county and big animal scale exceeding the threshold of the primary productivity for example of wuchuan county , which above - mentioned leads to the fact that coupling mechanism between agriculture and animal husbandry system has not been established , and agriculture and animal husbandry is still in the state of disharmonic on the whole . 3 主要表现为两种典型结构模式，一种以安塞县为代表，农牧能值总体利用率较高，但畜牧业内部结构偏重食粮动物使得高质能转化率低下；另一种以武川县为代表，农牧业结构总体上朝趋于协调方向发展，但畜牧业规模过大，由于草畜平衡严重失调，导致农牧系统耦合机制难以稳定。
