农业环境科学学报2017，Vol.36Issue(8)：1462-1469,8.DOI:10.11654/jaes.2017-0254
大气臭氧胁迫对稻季土壤Cd生物有效性的影响
Atmospheric ozone stress improving biological availability of Cd in soil during the rice season
摘要
Abstract
The objective of this study was to determine the changes in the bioavailability of Cd in soil exposed to elevated atmospheric O3 during the rice season. Open- top chambers(OTCs)were used to set up normal atmospheric conditions and an elevated atmospheric O3 condition(elevated 40 nmol·mol-1 more than normal atmospheric conditions). We added 0 mg·kg-1,5 mg·kg-1, and 50 mg·kg-1 extrinsic Cd to soil to study the dynamic changes of Cd in the soil while the rice was growing. The changes in plant biomass and Cd content in different plant organs at the maturity period were recorded. Soil samples were collected at 0~5 cm, 5~10 cm, and 10~15 cm depths of topsoil at tiller-ing, jointing, heading, and maturity stages. The bioavailability of soil Cd was evaluated by the Community Bureau of Reference (BCR)se-quential extraction and the DTPA extraction. The results showed that ozone fumigation significantly reduced the grain yield of rice in the treatment of non-polluted soil, with a decrease of 2.92%. However, Cd content tended to increase in plant organs from contaminated soil—20.20%(moderately polluted soil)and 6.67%(heavily polluted soil), respectively. Ozone fumigation aggravated the activation of residual Cd in rice growth, and the vegetative growth period. Ozone fumigation demonstrated a negative effect on the growth of rice, while the presence of Cd pollution did more harm to the crops, which may increase the risk of Cd biological enrichment into the food chain.关键词
开顶式气室/臭氧浓度升高/镉/稻季/生物有效性Key words
OTCs/elevated O3 concentration/cadmium/rice season/biological availability分类
资源环境引用本文复制引用
王亚波,魏思雨,孙月,党婷婷,尹微琴,王圣森,王小治..大气臭氧胁迫对稻季土壤Cd生物有效性的影响[J].农业环境科学学报,2017,36(8):1462-1469,8.基金项目
国家自然科学基金项目(41371294) Project supported:The National Science Foundation of China(41371294) （41371294）
