论文部分内容阅读
一、节水灌溉工程建设和发展的简况北京市地处华北平原的北部,现有耕地面积621.73万亩,其中粮田444.66万亩,蔬菜48.42万亩。气候属于季风气候区,冬春干旱少雨,夏季暴雨集中,降雨年内分配不均,历史上旱涝灾害频繁。经过四十年的水利建设,北京的农业灌溉与排水事业得到了巨大的发展。农田有效灌溉面积达到了493万亩,旱涝保收面积达到363.02万亩。解放后四十年的灌溉发展史,实质上就是节水灌溉的发展史,但是真正把节水灌溉提到建设节水型
I. Introduction to the Construction and Development of Water-saving Irrigation Project Beijing is located in the northern part of North China Plain. The existing cultivated land area is 6,217,300 mu, including 4,446,600 mu of grain land and 484,200 mu of vegetables. The climate belongs to the monsoon climate zone, drought in winter and spring, rainfall in summer concentrated, uneven distribution of rainfall during the year, frequent droughts and floods in history. After 40 years of water conservancy construction, Beijing’s agricultural irrigation and drainage has made tremendous progress. The effective irrigated area of farmland has reached 4.93 million mu, and the area covered by drought and flood reaches 363.02 hectares. The history of irrigation development after 40 years of liberation is essentially the history of the development of water-saving irrigation. However, the actual introduction of water-saving irrigation refers to the construction of water-saving