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《Journal of Agro-Environment Science》 2008-06
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Influence of Different Speciation and Added Amounts of Outer Source Arsenic on Rape(Brassica campestris) Growth and Absorption of Arsenic

HU Liu-jie1,2, ZENG Xi-bai1,2, HE Yi-chen3, LI Lian-fang1,2 (1.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2.Ministry of Agriculture Key Laboratory of Agro-Environment and Climate Change, Beijing 100081, China; 3.Beijing No. 8 Middle School, Beijing 100032, China)  
The pot experiments under simulated condition were conducted to study the influence of the different speciation and added amounts of outer source arsenic (As) on rape (Brassica campestris) growth and absorption of arsenic. The results indicated that the low added amount of As was beneficial to improve the seeding rate of rape, while the high added amount of As led to decrease of the seeding rate significantly. As the added amount of As was up to 90 mg·kg-1, the seeding rate of rape in Dimethylarsinic Acid (DMA) and As (V) treatments deceased by 20.7% and 19.5% respectively. With the added amount of DMA increased, the biological yield of rape continuously decreased. However, the biological yield of rape increased as the added amount of As in the As(V) treatment was lower than 15 mg·kg-1. Only when the added amount of As(V) exceeded 15 mg·kg-1, the biological yield of rape decreased. The arsenic concentration in rape plant was gradually increased with the increase of the added amount of both DMA and As (V). Meanwhile, the available arsenic concentration in soils was significantly increased with the increase of the added arsenic content(P0.01), which was more obvious in the DMA treatment. In comparison with As (V), the DMA had much higher biological validity and toxicity for rape plant.
【Fund】: 国家“十一五”科技支撑计划课题“农田有害物质循环阻控与消减关键技术研究”(2007BAD89B03);; 国家自然科学基金“高风险土壤中砷的形态与价态转化及其机理(40871102)”的一部分
【CateGory Index】: X173
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