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一项大规模地下排水研究项目RAJAD(拉贾斯坦邦农业排水研究项目),在印度的拉贾斯坦邦实施,旨在控制因灌溉引起的土壤盐碱化问题。在12个野外试验地点获得了大量的地下排水数据。田间结果表明,地下排水系统对控制土壤盐碱化具有积极意义。广泛的监测结果显示,地下排水系统是控制土壤盐碱化的有效途径。试验数据表明,有地下排水系统的所有地区,其土壤盐化度都呈现出逐渐下降的趋势。土壤的脱盐速度在排水间距较小(<40m)时比排水间距较大时(>40m)要快。雨季通过地下排水系统淋洗排出的盐分数量大于灌溉季节引入的盐分数量。
RAJAD (Rajasthan Agricultural Drainage Research Project), a large-scale underground drainage research project, was conducted in Rajasthan, India to control soil salinization problems caused by irrigation. A large number of underground drainage data were obtained at 12 field test sites. Field results show that the underground drainage system is of positive significance for the control of soil salinization. Extensive monitoring results show that underground drainage systems are an effective way to control soil salinization. Experimental data show that all areas with underground drainage systems, the degree of soil salinity showed a gradual downward trend. Desalination rate of soil is faster when drainage distance is smaller (<40m) than when drainage distance is larger (> 40m). During the rainy season, the amount of saltwater discharged through the underground drainage system is greater than the amount of salinity introduced during the irrigation season.