生态环境学报2011，Vol.20Issue(11)：1758-1763,6.
大田条件下不同钝化剂对空心菜吸收镉的影响及机理
Mechanism and effects of different amendments on cadmium uptake by water spinach (Ipomoea aquatica Forsk.) in field conditions
摘要
Abstract
Field experiments were conducted to investigate the effects of four amendments (red mud, sepiolite, calcium magnesium phosphate and phosphate rock) on the growth of water sinach {Ipomoea aquatica Forsk.) and the corresponding cadmium uptake.. High or low dose of amendments, I.e., red mud (0.5% and 1.0%), sepiolite (0.3% and 0.5%), calcium magnesium phosphate (450 kg·hm-2 and 900 kg·hm-2) and phosphate rock (450 kg·hm-2 and 900 kg·hm-2) were used. The results showed that all amendments decreased the content of soil available cadmium significantly. The passivation ability was in order as: sepiolite > red mud > calcium magnesium phosphate > phosphate rock. The passivators increased the above-ground biomass of water spinach. At the first crop (50 days), the above-ground biomass increased considerably in treatments with high dose of red mud, low dose of sepiolite and high dose of calcium magnesium phosphate with an increasing rate of 78.7%、 75.2% and 76.6%, respectively. At the second crop (80 days), the above-ground biomass increased most significantly in treatment with high dose of red mud or calcium magnesium phosphate with rate of 24.6% and 34.5%, respectively. In contrast, the influence of passivators on cadmium uptake of water spinach differed between the first and second crop. At the first crop, passivators promoted Cd accumulation in root but inhibited it in above-ground biomass. The inhibition effect on the Cd accumulation in above-ground biomass was most great when high dose of red mud or sepiolite was applied, with the cadmium contents decreased 27.3% and 23.2%, respectively. At the second crop, the Passivators (except the sepiolite) inhibited the cadmium uptake significantly either in root or in above-groud biomass. The inhibition effect was most great when high dose of PhosPhate rock or red mud was applied. Overall, red mud is the best material for protecting farm produce safety and the sepiolite is least useful.关键词
钝化材料/镉/有效性/空心菜(Ipomoea aquatica Forsk.)Key words
amendments/ cadmium/ availability/ water spinach {Ipomoea aquatica Forsk.)分类
资源环境引用本文复制引用
丁永祯,宋正国,唐世荣,冯人伟,张长波,周莉..大田条件下不同钝化剂对空心菜吸收镉的影响及机理[J].生态环境学报,2011,20(11):1758-1763,6.基金项目
国家自然科学基金项目(30900924) （30900924）
农业部行业专项"农产品产地重金属污染阈值应用与配套技术集成与示范"(200903015) （200903015）
国家科技支撑计划课题(2009BADB7B01) （2009BADB7B01）
中央级公益性科研院所基本科研业务费专项资助 （）
