微咸水灌溉对苏北海涂水稻产量及土壤盐分分布的影响

Effect of Brackish Water Irrigation on Rice Yield and the Distribution of Soil Salt Content in Coastal Saline Soil in North Jiangsu Province

通过田间小区试验，研究了不同矿化度和灌水量组合对水稻产量及土壤盐分的影响。结果表明，水稻产量与灌水量正相关，与灌溉水矿化度负相关；M1V3处理水稻产量较控制处理减产最少，M3V1处理水稻减产最多；淡水资源短缺情况下，低矿化度足量微咸水灌溉优于淡水限量灌溉；收获后，各处理O～20cm土壤盐分呈累积趋势，20～40cm土壤呈脱盐趋势，均属于非盐化或者轻度盐化土壤，没有加重土壤的盐渍化程度。

Field plot experiments were carried out to study the effects of different mineralization degrees and irrigation quotas on rice yield and soil salinity distribution in the coastal saline soil of northern Jiangsu. Results indicated that there was a positive correlation between rice yield and the irrigation quota, and there was a negative correlation between rice yield and the mineralization degree of irrigation water. The rice yield in M~ Va treatment decreased least while the yield in M3 V1 treatment decreased most. Low mineraliza- tion with sufficient irrigation quota was better than freshwater irrigation with limited irrigation under in- sufficient freshwater resource. Soil salinity at 0-20 cm had a downward trend after harvest of rice. The soil of and the degree of the soil salinity concentration changed layer had a cumulative trend and 20-40 cm layer 0-40 cm was non-salinized or mild salinized soil hardly after brackish water irrigation.