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水是最宝贵的资源之一。水资源包括地表水,土壤水和地下水。水资源不足是一个世界性的问题。我国人均占有径流量只有2600m~3,为世界人均占有量的19.5％,耕地平均径流量667m~2为1750m~3,为世界耕地平均径流量的73％,是水资源不丰富的国家。尤其是由于水资源分布的不平衡(淮河及淮河以北地区耕地面积占全国的64％,水资源却只占全国的19％)更加剧了水资源供需矛盾,因此,全面节水,特别是占总供水量88％的农业节水,具有十分重要的意义。农业水资源的开
Water is one of the most valuable resources. Water resources include surface water, soil water and groundwater. Water shortage is a worldwide problem. The average runoff per capita in China is only 2600m ~ 3, accounting for 19.5% of the world average. The average runoff of cultivated land is 667m ~ 2, which is 1750m ~ 3, accounting for 73% of the world’s arable land runoff. It is a country that is not rich in water resources. In particular, due to the imbalance in the distribution of water resources (64% of the country’s arable land in the area north of the Huaihe River and the Huai River, water resources account for only 19% of the national total), the water supply and demand contradictions have intensified. Therefore, 88% of the total water supply for agricultural water saving, is of great significance. Agricultural water resources open