不同年限棉田膜下滴灌水盐运移规律实验研究

Research on Water-salt Movement Law of Drip Irrigation under the Film in Cotton Field in Different Years

通过不同年限膜下滴灌棉田中播前、苗期、盛花期、收获期4个不同时期在1m土层内水盐运移规律的田间试验资料分析。初步得出，相同年限棉田在4个不同的生育阶段各土层在播前土壤含水量较大，到苗期含水量减少，灌头水后含水量逐渐增大，到盛花期含水量达到最大，而后含水量又减少，到收获期含水量达到最小；含盐量的变化特征是相同年限棉田在播前含盐量很大，苗期含盐量降低，到盛花期含盐量升高，到收获期含盐量又降低；在相同的生育阶段，不同年限的棉田随着种植年限的增加盐分累积逐渐增加；30-60cm深度是棉田盐分最大聚集区。

Through the analysis of field data about water-salt movement in 100 cm layer deepth of ten different year＇s in drip irrigation of cotton fields of Xinjiang Shihhotze during the four different periods including before sow, seedling period, prosperous flower period, harvest period. We draw the conclusions：different layer soil water content before sowing in the four growth stage at the same time is higher than that during the seedling period. Water content increases after the first irrigation. There is maximum water content in the prosperous flower period,after which it reduces,it reduces to the minimum during the harvest period;Movement character about the salt at the same time in the different growth stage is that salt content before sowing is the maximum,it drops during the seedling period,it grows during the prosperous flower period,it drops again during the harvest time; At the same growth period salt accumulation of the cotton in the different time increases with increasing of planting years. 30-60 cm soil layer is the maximum accumu-lative area of salt.