长江上游水土保持和营造防护林体系关系到中下游长治久安

据1982年统计,长江流域水土流失面积已增加到73.94万平方公里,占总面积的41%,比1957年增加了1倍,虽然宜昌站测定年输沙量为6亿吨,但全流域的土壤侵蚀量可达24亿吨,比黄河流域严重得多。水土保持和防护林体系,关系到这一地区的社会经济发展、广大农民的脱贫致富以及改善生态环境的长远利益,也关系到中下游广大地区的长治久安。

Soil conservation and construction of the protecting-forest system on the upper reaches of Yangtze River, being related to the control and safty on the lower reaches for long time

It is accounted that in 1982 the soil erosion area in Yangtze Riverwatershed has been raisen to 739,400km~2,being amounted to 41% of the totalarea and 1 times more than that in 1957.Although the annual sedimentload observed at Yichang station is 600 million tons,the total soil loss ofthe whole watershed can reach 2 billion ton,much more serious thanthat in the watershed of Yellow River. Soil conservation and protecting-forest system is connected with the social-economic development, thethrowing of poorness and obtaining of riching as well as the long-termbenefit in improvement of ecological environment of the region, it is alsorelated to the control and safty for long time of the wide area at middle-lower reaches.