摘要
在南疆气候条件下,研究了膜下滴灌盐分动态变化及平衡,结果表明:在南疆,棉花苗期时,土壤盐分开始分区,盐分在膜间0～40 cm强烈聚集,膜下盐分变化不大,而且在覆膜的作用下发生侧向运移,移向膜间,加剧了膜间的盐分累积;棉花生育期结束后,土壤0～60 cm盐分都有增加,在膜间0～20 cm盐分强烈累积;灌水量为345 mm的处理盐分增加明显,积盐率高达94.5%,其增加的盐分主要来自下边界土壤水分上行所带来的盐分,占盐分增加量的57%,而灌水量505 mm处理增加的盐分主要来自灌溉水所携带的盐分,占81%,若不考虑灌溉水的矿化度,膜下滴灌土壤盐分的积盐率只有13.8%.
The field experiments were conducted at Yuli county of Xinjiang in 2004 from Apr. to Oct. It is tound that in south Xinjiang, in cotton seedling stage, because of covering the function of the membrane, the salt in soil begin the dividing area, the salt is gathered strongly in 0-20 cm in uncovered area, and the salt of soil under film had taken place side direction transport and move to the uncovered area which have aggravated the salt of uncovered area even more. After cotton growing stage finishing, the salt of 0- 60 cm layers have increased, and assembled sharply in the uncovered area in 0-20 cm layers; The salt of lower water treats enhanced greater,the ration of salt accumulation reached 94.5%,which mainly come from the salt that moving up water carried on, up to 57 % of increased salt,and the salt increased of higher irrigation treats mainly come from the salt irrigation water carrying on, was about 81%, so adding irrigating water can decreased the accumulation of salt in a certain extent.
出处
《水土保持学报》
CSCD
北大核心
2005年第6期82-85,共4页
Journal of Soil and Water Conservation
基金
中科院知识创新重大项目资助(KZCX1-08)
关键词
膜下滴灌
盐分动态及平衡
棉花
南疆
drip irrigation under plastic mulch
dynamic and balance of salt
cotton
south Xinjiang
