膜下滴灌不同盐度土壤棉田水盐运移规律研究

Water and Salt Dynamic in the Soil with Different Salt Contents under Film Mulched Drip Irrigation in Cotton Field

通过对棉田整个生育期的土壤盐分和土壤水分测定,研究不同盐度土壤膜下滴灌棉田不同土层水分和盐分变化及其对棉花生长的影响。结果表明,盐分在0～20cm土层降幅较大;40～80cm土层为膜下滴灌棉田盐分积聚区。整个生育期2种土壤盐分在前期(现蕾期)快速下降,后期有所增加,中度土壤和轻度土壤的各层平均含盐量都有着极显著的差异。中度和轻度盐渍化土壤在棉花整个生育期内平均土壤含水率变化无显著差异。中度盐渍化和轻度盐渍化棉田的单株干物质积累量在生长前期差异显著,后期不显著。

The two soils with different salt contents（moderate salinity EC25：3~7 dS/m and mild salinity EC25：1~3 dS/m）were selected,throughout the growth period of cotton by soil salinity and moisture content determination,detecting soil salinity and water changes in different soil layers and their effect on cotton growth.The results showed that： apparently decline of soil salinity in the 0~20 cm,and accumulation zone in the 40~80 cm in the two soils with different salinity contents.Salinity of the two soils in the whole growth period decreased rapidly in the earlier stage（squaring period） and increased slowly in the later period.Throughout the growth period of the cotton,mild and moderate soil Stalinization average salt content of different soil layers had a very significant difference,while water content difference was not significant.Accumulation of dry matter per plant of cotton in the mild and moderate Stalinization soils had medium significant difference in the earlier growth period,and the later stage not significant.