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联合国世界资源研究所(WRI)发表了最新的世界资源报告书,其中关于水资源部分:当前全球水的总储量为1386×10~7亿立方米.其中海洋储存96.58%,其它各种水体储量只占3.42%(地表水和地下水各占50%左右)。在地球水体总量中,含盐量低于每升一克的淡水仅占2.5%(35×10~7亿立方米),在淡水储量中,有68.7%覆盖在两极地带和高山冰川中,有30.9%蒂积在地下含水层和永久冻土层中,只有0.4%容纳在河流、湖泊、土壤之中,全球多年平均降水量为1130mm;陆地平均降水为805mm;陆
The latest edition of the World Resources Report (WRI) is published by the World Resources Institute (WRI), which contains the following sections on water resources: The current total reserves of global water are 1386 billion to 700 million cubic meters, of which marine reserves are 96.58% and other types of water bodies Only 3.42% (surface water and groundwater each account for about 50%). Among the total amount of earth’s water bodies, only 2.5% (35 × 10 ~ 700 million cubic meters) of fresh water has a salt content of less than one gram per liter, and in the freshwater reserves, 68.7% covers the polar regions and the alpine glaciers, There are 30.9% pedicle sediments in the underground aquifers and permafrost, and only 0.4% is contained in the rivers, lakes and soils. The global average annual precipitation is 1130mm; the average landfall is 805mm;