Bai Ling-Yu, Zeng Xi-Bai, Hu Liu-Jie, Li Lian-Fang, He Qiu-Hong
Ministry of Agriculture Key Laboratory of Agro-Environment & Climate Change, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Ying Yong Sheng Tai Xue Bao. 2011 Feb;22(2):437-41.
A pot experiment was conducted to study the effects of exogenous dimethylarsinic acid (DMA) on the growth of Brassica campestris and the bioavailability of soil arsenic (As). With the increasing concentration of applied DMA, the emergence rate and biomass of B. campestris increased at low concentration DMA, but decreased at high concentration DMA. When the DMA concentration reached 90 mg x kg(-1), the emergence rate and biomass of B. campestris in the second cropping decreased by 9.5% and 57.0%, respectively, compared with those in the control, indicating that exogenous DMA had longer-term effects on the growth of B. campestris. The soil available As and the As uptake by B. campestris all increased with increasing concentration of exogenous DMA, and there existed significant correlations among them. After applied into soil, the exogenous DMA demethylated, with As(V) as the main product and lesser amount of As (III), and the concentrations of soil As(V) and As(III) increased with increasing application rate of exogenous DMA.
进行了一项盆栽试验，以研究外源二甲基胂酸（DMA）对油菜生长及土壤砷（As）生物有效性的影响。随着外源DMA施用量的增加，低浓度DMA处理下油菜的出苗率和生物量增加，而高浓度DMA处理下则降低。当DMA浓度达到90 mg x kg(-1)时，第二季油菜的出苗率和生物量分别比对照降低了9.5%和57.0%，表明外源DMA对油菜生长具有长期影响。土壤有效态As及油菜对As的吸收量均随外源DMA浓度的增加而增加，且它们之间存在显著相关性。外源DMA施入土壤后发生脱甲基作用，主要产物为As(V)，As(III)含量较少，土壤中As(V)和As(III)的浓度随外源DMA施用量的增加而升高。
