| 1. | Abstract : this paper analyzes causal factors of flood in the middle reaches of changjiang river . due to neglection of environmental management , soil erosion in the upper and middle reaches of the changjiag river , lake sedimentation , large - scale reclamation of marshes , the flood regulation capacity of the lake was descended , and flood stage was risen and prolonged . consequently more and more river levees and lake dikes were reinforced almost every year to prevent the disasters , which made flood level go up and flood period last for more days . the frequency of flood and waterlogging disasters rose and their damage was enlarged . several proposals for flood prevention including agricultural modernization are put forward
文摘: 1998年长江大洪水后开始实施的“平垸行洪,退田还湖”的土地利用调整方案,从长远来说应寻求农业安全且收入逐渐提高条件下的土地利用,长江中游地区应积极推进农业现代化,提高农业劳动生产率,转移,减少分蓄洪区的人口,移民建镇,对区内的土地要促进其规模经营,由优秀的有文化的农民经营,平时只有少量的直接从事农业生产的经营管理人员,农忙时则大量地使用季节性合同工或实现机械化,大洪水时退田还湖,减轻长江干流大洪水的压力,减少分洪与特大洪灾时的损失,这样还可促进避洪、冬季农业等的发展,也有利于长江中上游地区陡坡耕地的退耕还林,还可在粮食充足时进行休耕,在旱灾、粮食紧张时扩大粮食生产? |
