生态环境学报2012，Vol.21Issue(4)：770-774,5.
水作和旱作对叶菜吸收镉的影响差异研究
Comparison between water-submerging-cultivation and dry farming in reducing Cd concentration in waterspinach
摘要
Abstract
In order to reduce Cd concentration in vegetables, a pot experiment was carried out to verify if wa-ter-submerging-cultivation can decrease Cd uptake by waterspinach (Ipomoea aquatica) grown in contaminated soil comparing with the normal dry fanning. Results showed that there were significant differences between the water-submerging-cultivation and the dry farming in biomass and Cd concentration of water spinach. The water-submerging treatment increased shoot and root fresh biomass of waterspinach by 16.3% and 190.6%, respectively, while decreased shoot and root Cd concentration in waterspinach by 52.2% and 49.3%, respectively, compared to the dry-farming. For soil pH and DTPA-extractable Cd content, significant difference was ob-served between the two water patterns. With the waterspinach planting, soil pH increased 0.99 unit under the water-submerging treatment than that of the dry-farming, and soil DTPA-Cd decreased by 40.0%. Without planting, soil pH under the wa-ter-submerging treatment was also higher than that of the dry-farming treatment by 1.48 unit, and soil DTPA-Cd decreased by 30.4%. Stepwise regression analysis indicated that the dominant factors controlling shoot Cd concentration in waterspinach were soil DTPA-Cd and soil pH. Thus, water-submerging cultivation might be an eco-friendly and low-cost measure to reduce Cd concentra-tion in waterspinach grown in Cd-moderately-contaminated soils.关键词
水作/旱作/空心菜/CdKey words
water-submerging cultivation/ dry fanning/ waterspinach/ Cd分类
资源环境引用本文复制引用
王艳红,李盟军,唐明灯,艾绍英,余丹妮,罗英健..水作和旱作对叶菜吸收镉的影响差异研究[J].生态环境学报,2012,21(4):770-774,5.基金项目
广东省社会发展项目(2007A032303001 （）
2010B031800013) （）
