论文部分内容阅读
灌溉工程一般包括取水、输水、配水和排水等设施。大小灌溉工程现已遍布世界各地。据联合国粮农组织估计,到2000年全世界灌溉面积将达到45亿亩,在下个世纪初灌溉将更高速发展。搞好灌溉工程,发展灌溉事业无疑是人类用以增加粮食生产的重要手段。然而,灌溉工程对自然环境的影响也是不容忽视的。首先,让我们看看灌溉工程对生态系统的影响。由于灌溉工程的建设,使荒漠有了水源,带来了生命,变成了繁荣的绿洲。在我国西北地区,原来的许多沙漠地带,通过灌溉已变成绿洲,新疆石河子地区就
Irrigation projects generally include water, water, water distribution and drainage facilities. The size of irrigation projects are now all over the world. According to the UN’s Food and Agriculture Organization (FAO) estimates, the world’s irrigated area will reach 4.5 billion mu by the year 2000 and irrigation will develop at a rapid rate by the turn of the century. Doing a good job in irrigation projects and developing irrigation is undoubtedly an important means by which mankind can increase grain production. However, the impact of irrigation projects on the natural environment can not be ignored. First, let us look at the impact of irrigation projects on the ecosystem. Due to the construction of irrigation projects, the desert has brought water and brought life into an oasis of prosperity. In the northwest of our country, many of the original desert areas have become oases by irrigation. The Shihezi area in Xinjiang