绿洲滴灌棉田土壤水盐动态变化研究

Soil Water-salt Dynamic Change for Cotton Field under Mulched Drip Irrigation on Oasis in Xinjiang

采用田间试验对盐渍化棉田不同生育时期、不同深层土壤盐分的动态变化进行了研究，结果表明；膜下滴灌在连续的滴水作用下可在一定时间内降低土壤盐分，并不能从根本上减少土壤盐分；滴水开始后，水平方向上距离滴头越近土壤盐分积累越少，垂直方向盐分的积累主要在40～60cm土层，60～100cm土层盐分积累受膜下滴灌影响较小；不同土壤深层间、不同生育期间土壤盐分变化都达到了极显著水平。

Field trials on salinization cotton with drip irrigation under the plastic mulch in different growth stages and Soil depth were studied dynamics changes in soil salinity. The results showed that. continuous irrigation can reduce the soil salinity in a certain period of time, not fundamentally reduce. With the beginning of irrigation, the accumulation of salt in horizontal direction under the drop point is least than any other position. The accumulation of salt in vertical direction increase at the soil layers from 40 to 60 cm, but the one at the soil layers from 60 to 100 cm change a little. It reached a very significant level between the soil depth and different growth stages in soil salinity.