摘要
采用盆栽模拟试验,研究了不同形态外源砷对小油菜生长及吸收砷的影响。结果表明,添加低量砷有利于提高小油菜的出苗率,而高量砷则导致出苗率显著下降。其中,当砷添加量为90mg·kg-1时,二甲基砷(DMA)和As(V)处理下小油菜的出苗率比对照分别降低了20.7%和19.5%。随着砷添加量的增加,添加DMA处理小油菜的生物量不断下降,而添加As(V)处理在添加量小于15mg·kg-1时对小油菜具有一定的增产效果,超过15mg·kg-1时则随着添加量的增加而下降。无论是添加DMA还是As(V),小油菜植株中的砷含量均有随添加量增加而升高的趋势。与此同时,随着外源砷添加量的增加,土壤中有效态砷的含量亦呈显著增加的趋势(P<0.01),其中,添加DMA时的增加趋势更为明显,且其生物有效性和植物毒性均大于As(V)。
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（P〈0.01）, 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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第6期2357-2361,共5页
Journal of Agro-Environment Science
基金
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
关键词
砷形态
小油菜
生长
吸收
outer source arsenic
small rape （Brassica campestris）
growth
absorb
