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本文所指的川东,包括涪陵、万县两地区。总面积约6万平方公里,人口约1360万。探讨本区的生态系统与农业生产的关系,对四川盆地平行岭谷和盆周地区,乃至我国亚热带山地丘陵区,都具有一定的意义。 一、自然条件与生态学问题 从地貌上看,本区西部属四川盆地平行岭谷区,东部属盆周山地。区内山地占总面积51.5％,深丘占30.9％,浅丘和平原占17.6％。交通上,东部有长江三峡的夔门作入川的门户,南北有高山耸立作为四川的屏障。
This article refers to the eastern Sichuan, including Fuling, Wanxian two areas. The total area of about 60,000 square kilometers, a population of about 13600000. To explore the relationship between the ecosystem and agricultural production in this area is of great significance to the areas of parallel valleys and basins in the Sichuan Basin and even to the subtropical mountainous hilly areas in China. First, the natural conditions and ecological issues From the topography, the western part of this area is the Sichuan Basin parallel Linggou District, the eastern part of the basin-week mountain. The mountain area occupies a total area of 51.5%, deep mound 30.9% and shallow mound and plain 17.6%. Traffic, the eastern part of the Three Gorges of the Yangtze River Gate door into Sichuan, north and south mountains as a barrier in Sichuan.