摘要
为系统研究石煤矿山周边耕地富硒土壤地球化学特征及影响因素,在浙江省常山县辉埠石煤矿山周边耕地采集了表层土壤样品144件、农产品甘蔗样20件、土壤垂向剖面土壤样6件、岩石样5件和地表水样3件。通过样品Se、有机质、As、Cd、Cu、Pb、Zn、Ni、Hg、Cr等元素含量指标测定和统计,探究了该区富硒土壤地球化学特征。结果表明:区内表层土壤硒含量主要集中于0.47~1.34 mg/kg之间,平均含量0.87 mg/kg,远高于浙江省平均值,且硒含量高值区与辉埠石煤矿的走向一致;硒含量随着土壤深度增加而逐渐下降;89.58%的土壤样品和65%的甘蔗样品达到富硒标准,但存在土壤和农产品Cd等主要重金属元素含量超标的生态风险。土壤硒含量均值在寒武系下统荷塘组最高(1.31 mg/kg),奥陶系中—下统最低(0.64 mg/kg);旱地硒均值略高于水田,但差异不显著(p>0.05);硒含量均值高低变化为粗骨土>石灰岩土>水稻土>红壤。研究认为,土壤硒含量受地质背景、土壤类型和有机质等因素的影响,含石煤层黑色岩系和碳酸盐岩等富硒地层是形成富硒土壤的主要因素,小部分与矿山开采等人类活动有关。
To better understand the geochemical characteristics and influencing factors of the selenium-enriched soils of the arable land around the stone coal mine,144 topsoil samples were collected from the cultivated land around Huibu stone coal mine in Changshan County,Zhejiang Province,and 20 sugarcane samples,6 soil vertical profile samples,5 rock samples,3 surface water samples were collected at the same time.The contents of Se,organic matter,As,Cd,Cu,Pb,Zn,Ni,Hg and Cr were determined to explore the geochemical characteristics of Se rich soil.The results showed that Se content mainly concentrated in the range of 0.47-1.34 mg/kg in surface soil,with an average content of 0.87 mg/kg,which was much higher than that average value of Zhejiang Province,and the high value area of Se content was consistent with the strike of stone coal mine in Huibu.Se content decreased with the increasing depth along the vertical profile of soil.89.58%of the soil samples and 65%of the sugarcane samples reached the Se enrichment standard,but there was an ecological risk that the contents of Cd and other major heavy metals in soil and agricultural products exceeded the state standard.The average content of Se was the highest(1.31 mg/kg)in the 1 h of soil stratum,and the lowest(0.64 mg/kg)in the O_(1-2).The average selenium content in dry field was slightly higher than that in paddy field without significant difference(p>0.05).The highest average selenium content was that of coarse bone soil,followed by that of limestone soil and paddy soil,and that of red soil was the lowest.The selenium content in soil had been affected by geological background,soil type and organic matter.The main factors for the formation of selenium rich soil had been regarded as the stone coal bed,black rock series and carbonate rocks,and a small part was related to human activities such as mining.
作者
王美华
WANG Meihua(Zhejiang Institute of Geological Prospecting,China Chemical Geology and Mine Bureau,Hangzhou,Zhejiang 310002,China)
出处
《现代地质》
CAS
CSCD
北大核心
2022年第3期941-952,共12页
Geoscience
基金
中化地质矿山总局“土地质量调查与污染防治团队建设计划”项目(ZHTD201706)
浙江省常山县自然资源和规划局“常山县土地质量地质调查”项目(GSLT-GK-2017004)。
关键词
富硒土壤
地球化学特征
黑色岩系
影响因素
selenium-rich soil
geochemical characteristics
black rock series
influencing factors