额济纳绿洲滴灌棉田土壤水分动态变化研究

本文研究了额济纳绿洲滴灌棉田的土壤水分动态变化。结果表明 ,滴灌后形成的湿润区在平行于毛管方向上较大 ,垂直于毛管方向上较小。紧靠滴头的土壤含水量最高 ,随着离滴头在各个方向上距离的增加 ,土壤含水量逐渐减小。苗期和吐絮期棉花生长主要消耗土壤水 ,滴灌前土壤水分可分活跃层、较稳定层和缓慢变化层 ,滴灌开始后 ,土壤水利用量随着灌水定额的增大而减小 ,土壤水分活跃变化层下移。所有水分收入均用于棉花蒸腾和棵间蒸发 ,且随着灌水量增加 ,耗水量逐渐增大。

The Research on Soil Moisture Dynamic Change of Drip Irrigation Cotton Field on Ejina Oasis

The paper study on soil moisture dynamic change of drip irrigation cotton field. The research shows that wetness areas on direction of paraleling to fine pipe is larger than that of vertical direction. The soil water content is largest near emitter, but it reduces in all directions little by little away from emitter. The cotton growth mainly consumed soil moisture in seeding and wool. The soil moisture is make up active layers, steadier layers and slow change layers before drip irrigation, but after drip irrigation, the uses of soil moisture decrease with irrigation accretion, and moisture active layers move down to next layers. All of water input are consumed by transpiration of cotton and evaporation of cotton field, The consumed water increase slowly with irrigation accretion.