摘要
废水的再循环与再利用是解决水存源匮乏的主要方法。灌溉的尾水及深层渗滤水（灌溉回归水）的再利用是干旱及半干旱地区扩大灌溉面积的有效途径。但灌溉回归水的盐分含量高，有的还含有ＮＯ３、Ｂ、农药及某些微量元素。美国加州ＳａｎＪｏａｑｕｉｎ河谷西南侧因地质构造、地形、土壤结构、气候等原因，灌溉排水中盐分剧增，而且发生了未曾预计到的硒的增高。这种排水１９８２年流入Ｋｅｓｔｅｒｓｏｎ国京野生动物保护区。因食物链的逐级富集，致使水禽、鱼类中毒、胚胎畸变及死亡。
The recyclying aid reuse of sewage water is an importai,tmethod tosolve the problem of water resource shortage. The reuse of irrigation tail water and seepage water in deep soil layer (return water)is an effective way to extend irrigationarea in the arid aiid semiarid regions,Irrigation rettirn water contains the high amountof salt elemeiit,and tqome even may contain NO3,B agricultural chemicals and trace ele-ments.Salt contents in irrigation drainage water in the southwest side of San JoaptuinRiver valley in California increase dramatically with seleniuim concentration rising up bo-catise of such factors as geofornlation. topography,soil strticture and climate,and thislesson should be learnt.
出处
《干旱地区农业研究》
CSCD
北大核心
1996年第1期78-83,共6页
Agricultural Research in the Arid Areas
基金
国家自然科学基金
关键词
灌溉回归水
再利用
水质问题
硒
irrigation return water
reuse
water quality
selenium
mineralization
