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据统计,我国荒漠化土地262．2万平方公里,占国土总面积的27．3%,而且由于森林覆盖率低,加之长期以来重采轻育,导致水土流失严重。植树造林是解决土地荒漠化的唯一出路,但在干旱、少雨地区成功造林是全世界的难题。因此寻求一种雨季吸水、旱季放水的物质为植物生长持续提供水分,成为科学家研究的热点,具有这种功能的保水剂也就应运而生。保水剂是一种高分子材料,可在农业、林业、水利、沙产业等领域发挥抗旱保苗、增产增收、改良土壤、防风固沙、水土保持等多种功能。
According to statistics, the desertified land in China is 2.622 million square kilometers, accounting for 27.3% of the total land area. Due to the low forest coverage and the long-term re-mining and light breeding, soil erosion has been serious. Afforestation is the only solution to land desertification, but successful afforestation in arid and dry areas is a worldwide problem. Therefore, seeking a water-absorbing rainy season, the material released in the dry season for the plant to provide continuous water supply has become a hot research scientist, with this function also came into existence water-retaining agent. Water-retaining agent is a kind of macromolecule material, which can play various functions such as drought relief, seedling raising, yield increase, soil improvement, windbreak and sand fixation, water and soil conservation in agriculture, forestry, water conservancy, sand industry and other fields.