关于系统耦合理论的探讨

系统耦合理论是近年来研究的热点问题。以农牧交错带为例，针对在生态经济系统目前该理论的定量化方面研究不足的事实，提出用能值方法考虑农牧交错带系统耦合的机制，并指出农牧交错带系统耦合机制应建立在土地利用方式、子系统间能值转化过程和生态系统的能值储备上；同时影响系统耦合机制的主要因素有初级生产力的大小、畜牧业的内部结构和畜牧业的发展规模以及生态系统服务价值的大小。还探讨性地提出系统耦合度的概念化公式，期望能更好地应用并发展这一理论。

Discussion about the Theory of System Coupling-A Case Study ofTheecotone between Agriculture and Pasture in North China

Theory of system coupling is being focused on in recent year .The complex system not only includes mass and energy flow but also economy and information flow. How to unify and compare the different flow is a key question faced on the system coupling. Based on the fact that it lacks of quantification about the theory at present, this paper puts forward the new idea about mechanism of system coupling using emergy method in the ecotone between agriculture and pasture in North China as an example, where has serious dilemma of economical and ecological. The emergy concept recognizes that different types of energies have different abilities to do work. Emergy method provides quantitative way for complex system analysis. This paper also makes proposal that the mechanism of system coupling should be based on different land use manner and procedure of emergy transformation among different subsystem, also and emergy reserving through ecosystem service. At the same time it holds that can effect the mechanism mainly includes the primary productivity, inner constitution and the scale of animal husbandry and the value of ecosystem services. This paper also tries to develop the formula of system coupling under inner circle of ecosystem.