摘要
土壤镉(Cd)污染及由此造成的水稻籽粒Cd超标是近年来我国农业环境和农产品安全领域面临的一项重要问题,对人体健康造成严重威胁。为明确稻田土壤理化性质变化和Cd污染风险及相互关系,通过51个定位监测点连续5 a对水稻籽粒和其对应的土壤进行协同监测。结果表明,监测区域内土壤酸化比较严重,土壤养分含量较高,年度之间差异不明显。土壤总Cd含量变化范围为0.067~1.260 mg/kg,土壤有效Cd含量变化范围为0.018~0.992 mg/kg,水稻籽粒Cd含量变化范围为0.003~1.170 mg/kg,籽粒Cd富集系数变化范围为0.013~2.396。5 a内总体上土壤Cd与水稻籽粒Cd污染、潜在生态风险指数(Ei)及风险熵(HQ)较低并呈下降趋势,但土壤Cd生物活性较高。随机森林模型(Random forest mode)分析显示,土壤理化性状显著影响土壤总Cd和有效态Cd含量,土壤交换能力是影响水稻籽粒对Cd吸收的主要因子。研究结果可为受污染耕地分类管控和水稻安全生产提供科学依据。
Cadmium(Cd)pollution in soil and the resulting excessive Cd levels in rice grains have been an important issue in the agricultural environment and agricultural product safety fields of China in recent years,posing a serious threat to human health.To clarify the physical and chemical changes of paddy soil assessing cadmium pollution and their interrelationships,collaborative monitoring was conducted on rice grains and their corresponding soil through 51 positioning monitoring points for 5 consecutive years.The results showed that the soil acidification in the monitoring area was relatively serious,the soil nutrient content was high,and there was no significant difference between years.The variation range of total soil Cd was 0.067—1.260 mg/kg;The variation range of effective Cd content in soil was 0.018—0.992 mg/kg;The variation range of Cd content in rice grains was 0.003—1.170 mg/kg,and the variation range of Cd enrichment coefficient in grains was 0.013—2.396.Overall,soil Cd and rice grain Cd pollution,potential ecological risk index(Ei),and health risk assessment(HQ)were lower and showed a decreasing trend within 5 years,but soil Cd biological activity was higher.Random forest model analysis showed that soil properties significantly affected the total and available Cd in soil,and soil exchange capacity was the main factor affecting the uptake of Cd by rice grains.The research results can provide scientific basis for the classification and control of contaminated farmland and the safe production of rice.
作者
伍少福
孙涛
陈德
杨光瑞
叶雪珠
WU Shaofu;SUN Tao;CHEN De;YANG Guangrui;YE Xuezhu(Shaoxing Grain and Oil Crop Technology Promotion Center,Shaoxing,Zhejiang 312000,China;College of Environmental and Resource Sciences,Zhejiang University,Hangzhou,Zhejiang 310058,China;Institute of Agro-product Safety and Nutrition,Zhejiang Academy of Agricultural Sciences,Hangzhou,Zhejiang 310021,China)
出处
《中国无机分析化学》
CAS
北大核心
2023年第12期1342-1353,共12页
Chinese Journal of Inorganic Analytical Chemistry
基金
浙江省科技计划项目(2015C02042)
浙江省农业农村厅产业团队项目(浙农科发[2023]13号)
绍兴市科技局项目(2023A12005)。
关键词
监测
稻米
土壤性状
随机森林模型
镉污染
monitoring
rice
soil properties
random forest model
cadmium pollution
