咸水滴灌下沙漠公路防护林土壤理化性质的变化

Change in soil physical and chemical property in the Tarim Desert Highway shelterbelt under saline water drip-irrigation

对塔克拉玛干沙漠腹地防护林地下咸水滴灌下0-30 cm各层风沙土的理化性质进行了测定。结果表明, 咸水滴灌下, 土壤结皮层枯枝落叶量随防护林定植年限的增加而增加；土壤结皮层、0-5 cm、5-15 cm和15-30 cm土层土壤紧实度随防护林定植年限的增加而不断减小, 土壤有机质含量均随防护林定植年限增加而增加且自表层向下层逐渐减少, 土壤全盐量随防护林定植年限增加而逐渐降低且由表层向下层逐渐减少；结皮层各离子含量均随防护林定植年限增加而逐渐降低, 而0-5 cm、5-15 cm和15-30 cm土层各离子含量均随防护林定植年限增加而逐渐增加；结皮层、5-15 cm和15-30 cm土层土壤pH均随防护林定植年限增加而逐渐降低, 而0-5 cm土层pH随防护林定植年限增加而升高。

The physical and chemical properties of drip-irrigated aeolian soil with highly saline groundwater in the shelterbelt along the Tarim Desert Highway were investigated. The results show that surface layer litter quantity increases with shelterbelt age. Soil compactness in crust, 0-5 cm, 5-15 cm and 15-30 cm soil layers also decreases with shelterbelt age. Soil organic matter content increases with the shelterbelt age, and on the other hand, gradually reduces from the top to deeper layer of the soil profile. Total salt content decreases with both shelterbelt age and soil depth. Individual ions content in crust layer decreases, that in 0-5 cm, 5-15 cm and 15-30 cm soil layers increases with shelterbelt age. Soil pH in crust, 5-15 cm and 15-30 cm layers decreases with shelterbelt age, while that in 0-5 cm soil layer increases with shelterbelt age.