Influence of rice straw amendment on mercury/methylmercury accumulation in rice grains in the saline soils
ZHENG Shun-an1,2,3, HAN Yun-lei4, YUAN Yu-zhi5, NI Run-xiang1,2, WU Ze-ying1,2, HUANG Hong-kun1,2, SHI Rong-guang3
1. Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China;
2. Key Laboratory of Technologies and Models for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture, Beijing 100125, China;
3. Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China;
4. Chinese Association of Agricultural Science Society, Beijing 100125, China;
5. Guangdong Institute of Eco-environment and Soil Science, Guangzhou 510650, China
A pot experiment was conducted to simulate a mercury-contaminated paddy fields irrigated with wastewater. Soil sample was collected from a typical wastewater-irrigated area of Tianjin, and exogenous salinity (0%, 0.2%, 0.5% NaCl), mercury (0, 5mg/kg Hg(NO3)2) and rice straw (0, 0.1%) were added into soil manually to discuss the influence of rice straw amendment on total mercury (THg)/methylmercury (MeHg) accumulation in rice grain. Results showed that, (1) Methylation of inorganic mercury in paddy soil-rice system was promoted by rice straw amendment. After rice straw amendment, MeHg concentration in soil and rice grain increased by 56.8%~76.8% and 127%~171.6% respectively. (2) Stimulation of methylation of inorganic mercury in mild salinized paddy soil by rice straw amendment was even more serious, and which lead to an additional increment of MeHg in rice grain. Compared with un-salinized soil, MeHg in soil and rice grain increased by 92.2%~101.2% and 52.8%~132.1% respectively after rice straw amendment. However, in a more serious salinized soil (0.5% NaCl), methylation of inorganic mercury in soil was suppressed and MeHg accumulation in rice grain decreased. MeHg concentration in soil and rice grain decreased by 57.9%~88.6% and 72.9%~86.8% respectively in moderate salinized soil (0.5% NaCl) after treated with rice straw amendment, compared with in un-salinized soil. These results indicated that the treatment of rice straw amendment in a medium or low level salinized soil with Hg contamination may lead to adverse effect to human health. Therefore, treatment of rice straw amendment in this kind of area should be cautious.
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