论文部分内容阅读
生态环境是一个涉及面十分广泛的问题,随着社会经济的发展越来越引起人们的关注。引黄灌区的生态环境,主要包括水环境、土壤环境、生物环境和社会环境四个方面,特别是水环境在生态环境中占有举足轻重的地位。开展引黄灌区生态环境评价,对灌区生态环境由被动治理走向主动防护具有十分重要意义。1 灌区生态环境的现状与问题截至1990年,黄河下游豫、鲁两省共有万亩以上引黄灌区91处,年均引水88.4亿m~3,年均引沙1.64亿t。如此多
Ecological environment is a very wide range of issues involved, with the social and economic development more and more cause for concern. The ecological environment of Yellow River Diversion Irrigation District includes four aspects: water environment, soil environment, biological environment and social environment, especially water environment occupies a pivotal position in the ecological environment. Carrying out the assessment of the ecological environment in the Yellow River Diversion Irrigation District is of great significance to the active protection of the ecological environment in the irrigated area from passive management to active protection. 1 Present Status and Problems of Ecological Environment in Irrigation District As of 1990, there were 91 irrigated areas of diversion irrigated area of more than mu in the lower Yellow River, with average annual water intake of 8.84 billion m 3 and 164 million t of sands per year. this much