耕地生态位及其数学测度模型构建研究

生态位理论是生态学重要的基础理论之一。以生态位理论为基础，提出了耕地生态元和耕地生态位的概念，并对耕地生态位的主体、本质、类型、特征及其演替规律作了系统阐述；构建了耕地生态位数学测度模型，包括耕地生态位宽度模型、耕地生态位扩充压缩度模型、耕地生态位商模型和耕地数量生态位重心模型，从而为区域耕地数量和质量变化研究提供了新的理论与方法。

Construction on the Cultivated Land Niche and Its Mathematical Model

Niche theory is an important theory of ecology. The author firstly puts forward some concepts about cultivated land ecounit and cultivated land niche, and expounds its object, essence, types, characteristic and development law based on niche theory. Finally, cultivated land niche mathematical model is established including cultivated land niche, expansion-reduction-degree, niche quotient and quantity niche barycenter, which provides new theory and ways for the study on the change in the quantity and quality of cultivated land.