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近几年来,塑料大棚栽培技术迅猛发展,大幅度改善了蔬菜生产面貌,提高了科学种菜水平。到1995年,我省已发展大棚蔬菜6万余亩。但大棚土壤盐渍化问题相继出现,却阻碍了大棚蔬菜生产的提高和发展。我省地处东南沿海,大部分老菜区主要分布沿海沿江一带,地下水含盐量较多。随着地表水分的蒸发,地下水的上升,水中的盐分不断在农田表土层中积累。在大棚覆盖条件下,这些盐分得不到雨水淋洗,日子一长,便造成大棚土壤盐渍化。据浙江农业大学等单位调查结果,杭州市郊菜区的大棚土壤电导率比露地土壤高出4～5倍。当土壤盐渍化,土壤溶液浓度高于细胞液浓度时,
In recent years, the rapid development of plastic greenhouse cultivation techniques, substantially improve the appearance of vegetable production and improve the level of scientific planting vegetables. By 1995, the province has developed more than 60,000 acres of greenhouse vegetables. But the greenhouse soil salinization problems have appeared, but hindered the greenhouse vegetable production and development. The province is located in the southeast coast, most of the old vegetable area is mainly distributed along the coast along the Yangtze River, groundwater salinity more. As surface water evaporates and groundwater rises, salt in the water accumulates in the topsoil of the farmland. Under the conditions of shed coverage, these salts are not leached by the rain. As a result, the soil in the greenhouse is salinized. According to the survey results of Zhejiang Agricultural University and other units, the greenhouse soil conductivity in the suburban area of Hangzhou is 4-5 times higher than that of the open soil. When soil salinization, soil solution concentration is higher than the concentration of cytosol,