农业生态系统循环功能的综合评价(Ⅱ):实例研究

Comprehensive Evaluation on the Circulation Function of Agro ecosystems (Part 2).

运用描述系统循环过程中动力与阻力相互关系的数学模型，对河北省曲周县、邯郸市、马头镇、北京郊区窦店村、湖南桃源县观山村５个不同类型的农业生态系统的循环功能分别进行了分析与计算，发现模型中的系数Ｋ适于用来综合评价系统的循环功能。Ｋ值的大小取决于其他相关的指标，这些处于不同层次上的指标构成了一个简单实用的综合评价农业生态系统的指标体系。

The mathematical model which describes the relationship between dynamic and resistant factors in system circulation processes has been adopted for the analysis and calculation of circulation functions of five different agro ecosystems. The coefficient K of the model has been found to be appropriate for conducting comprehensive evaluation on circulation functions of agro ecosystems. The value of K depends on the other related parameters. Those parameters of different levels composed a simple and practical index system for comprehensive evaluation of agro ecosystem.