塔里木河下游地区新生林地滴灌后土壤水盐再分布特征

以塔里木河下游农二师35团8连绿洲-荒漠交界处滴灌条件下的新生林土壤为研究对象,对滴灌结束24 h后的土壤水分、盐分分布特征进行了分析.结果显示:水平方向上,各点处纵剖面土壤含水率随着距滴头距离的增加逐渐下降,至距滴头75 cm处达最低值;而各点处土壤纵剖面含盐量则随着距滴头距离的增加逐渐上升,至距滴头75 cm处达到峰值.垂直方向上,无论水分还是盐分,在20-40 cm土层含量较高,至中下层趋于下降.水平方向上,随着距滴头距离的增加,滴头处土壤剖面含水率与其他点处土壤剖面含水率的相关性依次递减,距滴头75 cm处土壤剖面含盐量与其他点处土壤剖面含盐量的相关性依次递增;垂直方向上,与20-40 cm土层含水率相关性较强的是0-20 cm土层,在α=0.01水平上呈显著相关,其次是40-60 cm土层,在α=0.05水平上呈显著相关.

Redistribution Characteristics of Soil Water and Salt After Drop Irrigation in Young Forest Stands in Lower Reaches of the Tarim River

Effects of drip irrigation were studied on redistribution of soil water and salt in the soils under young forest stands at the fringes of an oasis and a desert in the lower reaches of the Tarim River.Results show that after 24 hours the soil water content decreased horizontally with increasing in distance from the nozzle and reached the lowest at the distance of 75 cm,but increased vertically with depth of the profile and peaked at 75 cm.Vertically along the profile both soil moisture and salt contents were high at 20-40 cm,and tended to decline with the depth,while horizontally,the relativity between the soil moisture content at Point 0 and those at others declined in a proper order while the relativity between the soil salt content at Point 75 cm and those at others increased in a proper order.Vertically,the moisture content in 20-40 cm layer was significantly correlated with that in 0-20 cm layer with P<0.01,and then with that in 40-60 cm layer with P<0.05.