南疆膜下滴灌不同盐分棉田水盐运移规律研究

Study on Water and Salt Transport Law of Cotton Fields with Different Salinity under Drip Irrigation under Mulch in South Xinjiang

以库尔勒包头胡农场滴灌棉田为研究对象，讨论不同盐分棉田在棉花生育期土壤水分和盐分的变化规律。结果表明：各盐分棉田含水率和含盐量随时间呈中等变异特征，含盐量变异性大于含水率。在棉花整个生育期含水率比较稳定，花铃期各盐分棉田水分差异明显；高盐分棉田含水率变化小于中、低盐分棉田含水率变化，且高盐分棉田含水率普遍高于中、低盐分棉田。在棉花整个生育期盐分的变化趋势相似，高盐分棉田盐分变化大于中、低盐分棉田。各盐分棉田随深度变化盐分差异明显，在10~20cm处各棉田舍盐量最小，40～60cm处为盐分的聚集处，各盐分棉田含盐量最大。

Taking the drip irrigation cotton field in Baotouhu farm of Korla city as the research object, this paper studies the change laws of soil water and salt in cotton field with different salinity during the cotton growth period. The results show that the moisture and salt contents show moderate variability along time, and the latter is larger than the former. Water content is relatively stable through the entire growth period, but shows significant difference in boll period. The change of moisture content in high salinity is less than that in middle and low salinity cotton field. Generally the moisture content in high salinity cotton field is higher than that in middle and low salinity cotton field. The salt change presents similar trend through the whole cotton growth period. Salt change in high salinity cotton field is greater than that in middle and low salinity cotton field. The salt content varies significantly along with the depth. The salinity is minimum at 10~20 cm cotton field. While the salt gathers at 40~60 cm and the salinity is maximum at that depth.