摘要
长江三峡淹没区农业人口就近安置的设想,梯田建设,进一步探索解决问题的途径,试验研究的序幕等几个方面提出了自己的看法们应注意的问题。
In the projected reservoir o f the Three Gorges on the Yangtse River,there are 440000 inhabitants living on tarming.For the resettlement of them, one possibility is the expansion of agriculture in 13 counties and cities in the immediate neighbourhood.This is a mountainous terrain dseply dissected by streams. More than 18% Of the load is cultivated, and a 17.6% of the ultivation is distributed on steep slopes>25 °φ Estimated on the agricultural cpopulation alone, the per capita cultivated area is 1.2 mu and per capita tood production 409 kg.Features ot serious water and miss erosion are seldom out of sight.Land deterioration is too obvious to escape the notice of even the lay mind. There is little room for the expansion of conventional agriculture.A proposal under consideration is chiefly the construction of contour terraces with stones on selected sites with slopes up to 25° either cultivated or noncult i vated. According to informatiom available and field observation in a few localities, this seems acceptable in soms cases.Some examples have even experienced unusually heavy storms and severe droughts.However ,furrther studies are necessary for assessment with respect to ecological and economic sustainability of terraces in recent years and of the sites for further construction.The search of alternatives for cheaper sustainale utilization of the sloping land is suggested. This includes in the main ths establishment of contour barrier hedgerows composed of woody plants and contourherbaceous strips to shape terraces in between and the use of the litter for plant. production to meet the demands of the local population and accessible markets. On the terraces contour planting contour tillage, minimum tillageand soil surfae mulch are called to provide additional protection agains t water eeosion and proper selection of plants, appropriats planting patterns aad and rotation for the replenishment of nutrients and the maintaince and improvement of soil physical properties Cost-effeetivensss analysis should be included
出处
《地理研究》
CSSCI
CSCD
北大核心
1993年第1期44-55,共12页
Geographical Research
