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应用生态学报 ›› 2011, Vol. 22 ›› Issue (02): 437-441.

• 研究报告 • 上一篇    下一篇

外源二甲基砷对油菜生长及土壤中砷生物有效性的影响

白玲玉1,曾希柏1**,胡留杰1,2,李莲芳1,和秋红1   

  1. 1中国农业科学院农业环境与可持续发展研究所/农业部农业环境与气候变化重点开放实验室, 北京 100081|2重庆市农业科学院茶叶研究所, 重庆永川,402160
  • 出版日期:2011-02-18 发布日期:2011-02-18

Effects of exogenous dimethylarsinic acid on Brassica campestris growth and soil arsenic bioavailability.

BAI Ling-yu1, ZENG Xi-bai1, HU Liu-jie1,2, LI Lian-fang1, HE Qiu-hong1   

  1. 1Ministry 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|2Tea Research Institute, Chongqing Academy of Agricultural Sciences, Yongchuan 402160, Chongqing, China
  • Online:2011-02-18 Published:2011-02-18

摘要: 通过盆栽试验研究了土壤中添加外源二甲基砷(DMA)对油菜(Brassica campestris) 生长及土壤中砷生物有效性的影响.结果表明:随着外源DMA添加量的增加,油菜的出苗率和生物量均在一定程度上表现出了低浓度促进而高浓度抑制的现象.当外源DMA添加量达到90 mg·kg-1时,第2季盆栽油菜的出苗率和生物量与对照相比分别下降了9.5% 和57.0%,表明DMA对油菜生长的影响具有长期性;随着外源DMA浓度的增加,土壤中有效态砷及油菜体内的砷含量均表现出增加的趋势,相关性分析表明,该三者间具有极显著相关关系;添加入土壤中的DMA主要发生去甲基化作用,产物主要为As(V)及少量的As(III),且随着外源DMA添加量的增加,As(V)和As(III)的浓度均表现出增加的趋势.

关键词: 二甲基砷, 油菜, 生物有效性, 去甲基化

Abstract: 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 reach ed 90 mg·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.

Key words: dimethylarsinic acid, Brassica campestris, bioavailability, demethylation