膜下滴灌棉田不同土层盐分变化及其对棉花生长的影响

研究选择两种不同盐分含量土壤（中度盐渍化EC25：4-7 dS.m-1和轻度盐渍化EC25：1-4 dS.m-1）,通过对棉田整个生育期的土壤盐分含量测定,研究棉田不同土层盐分变化及其对棉花生长的影响。结果表明：两种不同盐分含量土壤,盐分降幅较大的在0-20、40-80 cm土层为膜下滴灌棉田盐分积聚区。整个生育期土壤盐分变化趋势相似,都表现为土壤盐分前期（现蕾期）快速下降后期有所增加;中度盐渍化和轻度盐渍化棉田的单株干物质积累量差异不显著,单位面积的干物质积累和籽棉产量差异显著,其主要原因是两种盐分土壤棉花的成活率差异较大。

Effects on cotton growth and salinity changes in different soil depth of drip irrigation in cotton field

The two soils of different salt content（moderate salinity EC25 ： 4-7 ds·m-1 and mild salinity EC25： 1-4 ds·m-1）were selected,study the changes of soil salinity in different depths and effects on cotton growth through soil salt content determination in the total growing period of the drip irrigation cotton fields.The results showed： apparently decline of soil salinity in the 0-20 cm,accumulation zone in the 40-80 cm in the two soils of different salinity content.The whole growth period similar trends which early（squaring period） rapidly decrease and slowly increase in the late,the dry matter accumulation was not significant with single plant,dry matter accumulation and cotton yield were significant difference per unit area between moderate and mild salinity soil,mainly due to the survival rate of the two salinity soils was quite different.