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土壤盐渍化是影响作物产量与制约农业发展的重要因素.本文根据义长灌域2012年5-12月份的野外实测资料,分析了试验区土壤含盐量在垂向剖面上的分布特征和变化规律;研究了地下水埋深和矿化度季节性变化规律及其对土壤盐分运移的影响.研究结果表明:强烈的蒸发促进盐分向土表运移,随土层深度的增加,土壤含盐量呈降低趋势;土壤积盐脱盐交替频繁,交替周期与灌水周期相对应;地下水埋深受灌排系统影响较大,作物生育期内地下水矿化度无较大波动;由于土壤盐分运移受多种因素影响,在野外试验条件下,单一因素如地下水埋深或地下水矿化度与土壤盐分运移的关系不显著.研究结果可为义长灌域土壤盐渍化防治与水土利用提供理论依据.
Soil salinization is an important factor that affects crop yield and restricts agricultural development.According to field data from May to December 2012 in Yichang Irrigation Area, the distribution characteristics of soil salinity in the vertical section of the experimental area and The regularity of groundwater depth and salinities and the effect of salinity on the movement of soil salinity were studied.The results show that strong evaporation promotes salt migration to the soil surface and with the increase of soil depth, Salt content showed a downward trend; soil salt desalination alternated frequently and alternating cycles corresponded to irrigation cycles; groundwater depth was significantly affected by irrigation and drainage systems; groundwater salinity did not fluctuate significantly during crop growth period; Under the conditions of field experiment, single factor such as groundwater depth or salinity of groundwater has no significant relationship with soil salinity, and the results may provide some suggestions for soil salinization prevention and control and soil and water conservation in Yichang Irrigation Area Theoretical basis.