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农业生态系统质(物质)能(能量)流动是生态系统基本功能的体现,它关系着系统生产力的提高和能量效率的发挥。地处长江中游北岸的孝感地区,自然条件较优越,主产粮食、棉花、油料,是一个人口密度较大,多种多熟的粮食主要产区。全区耕地面积760万亩左右(土壤普查估算数,1980年上报数为560万亩),人口562.15万(1981年末数字),人平耕地1.35亩(如按1980年上报耕地面积计算,人平耕地只有0.996
The flow of agro-ecosystem energy (matter) energy (energy) is a manifestation of the basic functions of the ecosystem. It is related to the improvement of system productivity and energy efficiency. Xiaogan area, located in the north bank of the middle reaches of the Yangtze River, enjoys superior natural conditions and produces mainly grain, cotton and oilseeds. It is a major grain producing area with a large population density and a variety of multi-varieties. The total area of arable land in the region is about 7.6 million mu (soil census estimates: 5.6 million mu reported in 1980), population 56.215 million (as of the end of 1981) and 1.35 mu of cultivated land per capita (as calculated by the area of cultivated land reported in 1980, Cultivated land is only 0.996