咸水滴灌条件下土壤盐分运动规律

选择新疆尉犁县土壤含盐量较高的当年造林地,利用咸水进行滴灌,比较研究了4个月间不同灌溉量的土壤盐分变化,并对一个灌溉周期内灌溉前及灌溉后168 h时段,距滴头不同距离的土壤剖面盐分运移规律进行观测.结果表明:咸水滴灌,地表积盐现象明显,在0～10 cm土壤湿润区内部可形成一个低盐区,适宜林木根系发育；灌溉周期相同,单次灌量越大,盐分会被淋洗的更远,滴头附近积盐程度越轻；在一个灌溉周期内,盐分先向下和向内移动,后向表层和外侧移动.

Water and Salt Transport in Soil under Salt Water Drip Irrigation

An experiment was conducted to study the change in salt content in soil under different quantities of drip irrigation in four months.Newly afforested area with high soil salt contents in Yuli County of Xinjiang was selected to carry out the drip irrigation using salt water.The regularities of salt transport in the soil profiles were observed during 168 hours before and after the drip irrigation within the entire irrigation period.Result showed that the phenomenon of salt accumulation on the soil surface was quite general under drip irrigation with salt water.An area with low salt content was observed in the soil of humid area at 0-10 cm depth,which was suitable for forest growth.When the irrigation cycle was the same,the salinity was leached away farther if single quantity of irrigation was bigger,and the amount of salt accumulation was less in the areas close to the dropping points.The salinity moved downward and inward first,then to the surface and outer side during one cycle of irrigation.