长江农业文化的自然生态条件

The natural ecological condition for the agricultural culture of the Yangtze basin

优越的自然生态条件是长江流域农业文化的物质前提.研究表明,长江农业文化正是得太阳之恩惠,受温热之赐予,承雨水之滋润,赖沃壤之培育.就长江中下游而言,年太阳辐射总量多在460～520kJ/cm2之间,年平均气温在14～18℃之间,≥10℃时期的积温为5000～5500℃,年降水量为1000～1400mm;土壤资源丰富,宜于作物栽培的土壤类型多样.

The favourable natural ecological condition is the material premise for the agricultural culture of the Yangtze basin. The research indicates that, the agricultural culture of the Yangtze basin comes from the bounty of the sun, the grant of the warm climate with rain summer, the breed of the rich soil. In middle and lower reaches of the Yangtze basin, the annual global radiation is 460～502 kJ/cm2; mean annual air temperature varies between 14℃ to 18℃, the annual total of accumulated air temperature is 5 000～5 500℃; ≥10℃ annual total of precipitution ranges from 1 000 mm to 1 400 mm; varieties of soils are salubrious for agricultural woodland and stockbreeding.