黄河“断流”对该河段河水中主要离子化学特征的影响

RELATION BETWEEN WATER QUALITY CHANGES ANDTHE “DRYINGS-UP PHENOMENA” IN THE TELLOWRIVER, CHINA

根据全球水质监测计划(ＧＥＭＳ/ＷａｔｅｒＰｒｏｇｒａｍ)和我国水利部黄河流域的水质监测数据,对１９７０ｓ－１９９０ｓ期间黄河下游河水主要离子含量的变化趋势及其与“断流”现象之间的关系进行了研究．结果表明,近年来黄河下游“断流现象”的频频出现,主要与枯水期中、上游地区引水量急剧增加有关:黄河的“水质浓化”趋势也主要由中、上游地区大量引水灌溉农田引起．因此,黄河“断流”与“水质浓化”现象是同一人类活动的两个平行的生态后果．

The paper studies water quality and discharge trends in the lower reach of the Yellow river from 1960s to 1990s. The results indicate that the increasing of major ion contents in the Yellow river was caused by the increasing of irrigation water abstraction in the river basin. The 'drying-up' phenomena in the lower reach of the Yellow river was also caused by the rapid rise of water abstrac-tion in the upper and middle reaches of the Yellow. The authors conclude that the 'concentration trends' of water quality and the appearance of the 'drying-up' phenomena are two parallel out-comes by the same human activities in the river basins .