不同盐分棉田土壤水盐运移及其干物质积累的研究

Research on Soil Water and Salt Transport and Dry Matter Accumulation in Different Salinity Soil of Cotton Fields

研究选择2种不同盐分含量土壤(中度盐渍化EC25:3～7dS/m和轻度盐渍化EC25:1～3dS/m),通过对棉田整个生育期的土壤盐分和水分含量测定,研究棉田不同土层水分、盐分变化及其对棉花干物质积累的影响。结果表明:两种不同盐分含量土壤,盐分降幅较大的在0～20,40～80cm土层为膜下滴灌棉田盐分积累区,中度和轻度土壤在0～20cm土层分别下降1.73dS/m和1.04dS/m。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,中度土壤和轻度土壤的各层含盐量都有着极显著的差异;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,后期差异不显著。

The two-soil indifferent salt content（moderate salinity EC25： 3~7 dS/m and mild salinity EC25： 1~3 dS/m） are selected.Research is done on changes of soil salinity and moisture content and impact on dry matter accumulation of cotton fields in the whole growing period.The results show that apparentl decline of soil salinity in the 0~20 cm,moderate and mild salinity soil in the 0~20 cm soil layer decreased by 1.73 dS/m and 1.04 dS/m respectively.The whole growth period＇s similar trends which early（squaring period） decrease rapidly and increase slowly in the late,salt content of moderate and mild soil has a very significant difference in every soil layer.Per plant dry matter accumulation of moderate and mild salinity cotton field in the early growth stage has significant differences,late difference is not significant.