基于可拓工程方法的生态地理区域系统界线划分研究--以中温带半湿润、半干旱区为例

利用可拓工程方法中的物元模型对生态地理区域系统的界线划分问题进行了研究，通过选取样本和指标对单指标关联函数和多指标综合关联函数进行了定量计算。在此基础上，通过专家集成确定了中国中温带半湿润、半干旱区之间的界线，弥补了单指标和定性划分的不足，有助于中国生态地理区域系统的构建。

Demarcation of the Eco-geographical System Based upon the Extension Engineering Method

The extension engineering method introduces a matter-elementmodel, which consists of the matter, character and quantity. Formed as a three-matter set, it can be expressed as R=(matter, character, quantity)=(N, c, c (N)). Since th e extension engineering method aims to turn the qualitative analysis concerning yes or no into the quantitative one, a new approach to the distinction and judge ment has been developed. This paper presents a preliminary study on the demarcation of the eco-geographical regional system based upon the matter-element model. Through physio-geogr aphical analysis, documents and field investigations, combining the integrated a nalysis, dominant factors and expert integration, 40 typical sites were selected in the study area. Meanwhile, 4 indicators, i.e. the aridity index, growing sea son aridity index, profit and loss of soil moisture in growing season and the an nual precipitation were also selected to reflect the moisture regime. In view of the identical variation of crop water demands and the profits and losses of soi l moisture, in calculation, the profit and loss of soil moisture for maize was chosen as a representative indicator. By determining the classical scope, extensional scope, and the matter-elements to be identified, a single-index associated function and the multiple-index comprehensive associated function were calculated. Based upon this as well as vege tation and soil types, the boundary between semi-arid and sub-humid areas of mid-temperate zone in China was demarcated. In this study, not only the qualitative boundary between the above said, but also the boundary between the arid region in sub-humid area and the humid region in semi-arid area were proposed, which can reflect the transition of geographic boundary more objectively than before. The extension engineering method has an advantage of either rationally explaining the physio-geographic demarcation or avoiding the drawbacks of single-index and qualitative analysis of the former regionalization. It therefore, puts forward a new method for the establishment of the eco-geographical regional system of China.