摘要
用定期取表层土样测定其电导率和在不同深度埋设盐分传感器探头的方法 ,在作物生长季节内 ,监测了棉田膜内和膜间不同深度的土壤溶液含盐量变化。结果为 :1棉田膜内与膜间表层土壤和 1 0 cm、30 cm深土壤溶液含盐量变化较大 ,且规律相同。未灌水时上升 ,灌水后迅速下降。膜间未灌水期间的含盐量上升幅度大于膜内 ,灌水对膜内和膜间表土洗盐、1 0 cm、30 cm深土壤溶液含盐量的降低作用没有差别。降雨可引起膜内和膜间 1 0 cm深土壤溶液电导率的变化 ,这个影响也是膜间大于膜内。 2 60 cm深的土壤溶液不存在明显的盐分累积现象 ,灌水可使这里的土壤溶液含盐量缓慢降低 。
A field experiment was carried out with many Type 5500 salinity sensors used to monitor soil salinity variation in rows mulched with plastic film and in uncovered intervals. The results can be described as follows: (1) The salinity at soil surface, at 10 cm and 30 cm under surface changes obviously with similar pattern. Soil salinity decreased noticeably after an irrigation and increased gradually during irrigation interval. The salt leaching processes at all monitoring points are similar during an irrigation. But soil salinity at part mulched with plastic film increased quickly than that at uncovered intervals. The soil salinity at 10 cm under surface, both under plastic films in uncovered intervals, changed obviously during rain. But the change range in intervals is much larger than that under plastic films. (2) there is not noticeable salt accumulation at 60 cm soil layer under surface, regardless under plastic film or under uncovered intervals. Soil salinity decreased gradually with irrigation. The declining ranges in uncovered intervals is larger than that under plastic films.
出处
《灌溉排水》
CSCD
北大核心
2001年第3期37-40,共4页
Irrigation and Drainage
基金
国家重大基础研究资助项目 ( 19990 435 0 6 )
山川秀美资助项目 ( 2 0 0 0 10 0 9)
关键词
地膜覆盖
含盐量
土壤溶液
棉田
mulched with plastic film
salinity, soil solution, electric conductivity
