转型期中国耕地非农化与土地退化的实证分析

改革开放以来．伴随着国民经济的快速发展．中国的耕地非农化速度也在不断加快。并由此产生了大量的社会和环境问题。本文从人类土地利用行为变化的角度提出了分析耕地非农化对土地退化影响的基本思路：然后基于这一思路．并结合对全国层面统计数据的计量分析．深入探讨了转型期中国的耕地非农化对土地退化的影响：研究表明由耕地非农化所引致的耕地开垦、耕地集约利用以及非农建设用地扩张等人们土地利用行为的变化会最终引起土地资源的退化：包括水土流失和土地沙化的加剧、土壤质量的退化以及土地污染的加剧等。

A Positive Study on China's Farmland Conversion and Land Degradation in Transition

Since reform and opening,China's farmland conversion has speeded continually and caused a great number of social and environmental problems,along with the rapid development of national economy.This paper builds an analytical framework of the effects of farmland conversion on land degradation from the angle of human activities on land.Then,the effects on land degradation are discussed based on the above analytical framework and the econometric analysis using state-level data.The result shows that changes of human activities on land,such as farmland reclamation,intensive cultivation and construction land outspread resulted from farmland conversion,will eventually cause land degradation,including soil and water loss,land desertification,soil quality deterioration,and land pollution.