浙江省燃煤火电厂周边典型森林土壤汞污染研究  

Research on Mercury Pollution of Typical Forest Soils around Coal-fired Thermal Power Plants in Zhejiang Province

作　　者：曾台楠 许萍[2] 胡勰克 宋星竹 吴胜春[1] 梁鹏[1] ZENG Tai-nan;XU Ping;HU Xie-ke;SONG Xing-zhu;WU Sheng-chun;LIANG Peng(School of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300,China;China National Rice Research Institute,Hangzhou 311401,China)

机构地区：[1]浙江农林大学环境与资源学院,浙江杭州311300 [2]中国水稻研究所,浙江杭州311401

出　　处：《江西农业学报》2023年第1期158-165,共8页Acta Agriculturae Jiangxi

基　　金：浙江省自然科学基金(LY21D030001)。

摘　　要：在浙江省选取53个位于燃煤电厂15 km范围内的森林点位和附近无燃煤电厂的39个对照点位,在采样点采集土壤表层土样(0~20 cm),探明燃煤火电厂对周围森林土壤汞浓度的影响。同时,分析不同类型森林对土壤汞积累特征的影响。研究结果表明:燃煤火电厂周边15 km范围内土壤平均汞浓度为0.21 mg/kg,是无火电厂区域土壤汞平均浓度的1.75倍;燃煤火电厂周边5 km范围内森林土壤汞浓度显著高于此火电厂周边5 km以外的森林土壤汞浓度;浙江省燃煤火电厂周边阔叶林、竹林、针叶林和混交林土壤中汞浓度的平均值分别为0.21、0.26、0.14和0.10 mg/kg,阔叶林、竹叶林、针叶林和混交林汞的地累积指数的变化范围分别为-1.22~4.33、-0.92~3.31、-2.20~2.41、-1.85~1.40;阔叶林、竹叶林和针叶林中均受中—强度污染,而混交林受到了中度污染;土壤汞浓度与土壤的可溶性有机碳浓度、pH值、土壤含水率均呈显著正相关,而与土壤容重呈显著负相关;在对单个燃煤火电厂周围森林土壤进行等距离采样发现,总体上随着距离的增大,森林土壤汞浓度呈先上升后下降趋势。The surface soil(0~20 cm)samples from 53 forest sites located within 15 km of coal-fired power plants in Zhejiang Province were collected,while 39 sites without coal-fired power plants were used as control.The effects of coal-fired thermal power plants on forest soil mercury content were explored.Meanwhile the effects of forest types on soil mercury accumulation characteristics were also analyzed.The results showed that the average soil mercury concentration in the 15km range around the thermal power plant was 0.21 mg/kg,which was 1.75 times of the soil mercury concentration in the area without thermal power plants.The mercury concentration in forest soil within 5 km of the coal-fired thermal power plant was significantly higher than that in forest soil outside 5 km of the thermal power plant.The average values of mercury in broad-leaved,bamboo,coniferous and mixed forests around coal-fired thermal power plants in Zhejiang Province were 0.21,0.26,0.14 and 0.10 mg/kg.The range of mercury accumulation index in broadleaf forest,bamboo forest,coniferous forest and mixed forest in the study area was-1.22~4.33,-0.92~3.31,-2.20~2.41 and-1.85~1.40.In conclusion,broadleaf,bamboo and taiga were moderately polluted,while mixed forests were moderately polluted.Soil mercury concentration was significantly positively correlated with soil soluble organic carbon concentration pH and soil moisture content,and significantly negatively correlated with soil bulk density.Equidistant sampling of forest soils around individual coal-fired power plants showed that mercury concentrations in forest soils increased first and then decreased as the distance increased.

关 键 词：燃煤火电厂 森林土壤 汞污染 风险评价 

分 类 号：X53[环境科学与工程—环境工程]