关键词: 城市建成区, 有机碳储量, 有机碳密度

Abstract: In order to approach the related problems of China's agro-ecological research in 1990s,this paper ana-lyzed the new trends of structural changes in rural economy and agro- ecology.under condition of socialistmarket economy expounded some viewpoints on the coordinative development of agro-ecology and agro-economy,the strengthening of absorbing science and technology in countrysides and the reaching identityof ecolomical development of collective and individual economies,Based on these,the task,content andmethod of agro-ecological research in 1990s,the ways of agro-ecological research be geared to theneeds of production practice and the further standardization and systematization of agro-ecological con-cepts and theories are discussed.

Key words: built-up areas, organic carbon storage, organic carbon density.