历史时期长江三峡粮食作物嬗替的特征、成因及其影响--与川西平原、江南地区相比

长江三峡地区因地理环境、自然条件、地质结构等因素的限制，历史上，其农业生产水平与两侧的川西平原和江南地区相比，一直较为低下。就粮食作物嬗替这方面而言，也表现出相对落后的一些特征，这些特征曾给三峡农业发展带来了深远影响，不少影响还延续至今。

The Features, Reasons and Influences of Crops' Evolution in Three Gorges of the Yangtze in History--Comparison with Chuanxi plain and Jiangnan area

For the limit of the factors of geographical environment, natural conditions and geological structure the standard of agriculture produce of the Three Gorges area of the Yangtze River was lower than that in Chuanxi plain and Jiangnan area which lie on both sides of it when compared. As for the evolution of the crops, it also showed same backward features relatively. These features had once brought about a profound influence on the agriculture development of the Three Gorges. Some of them last for today.