摘要
为了对排污口周边河床土壤Cd污染的植物修复进行研究,以绵阳市涪江边典型区域排污口附近河床土壤Cd浓度为依据,采用盆栽方法,研究龙葵、商陆、肾蕨、金丝草、蜈蚣草、佛甲草6种典型植物种植后对不同污染水平(3 mg/kg、5 mg/kg和8 mg/kg)的土壤中Cd浓度及植物不同部位(根、茎、叶)Cd浓度的影响,探讨不同植物对不同Cd污染程度土壤的修复效果.结果表明:土壤Cd浓度为3 mg/kg时,龙葵和佛甲草的Cd富集系数最大,分别为蜈蚣草的18.18倍和20.54倍;且龙葵茎、叶和佛甲草根、茎Cd浓度分别为26.18 mg/kg、40.26 mg/kg和34.38 mg/kg、49.45 mg/kg,可用堆肥法进行资源化再利用,因此推荐栽种龙葵或佛甲草对工业区的居民生活区排污口周边河床Cd污染进行修复.土壤Cd浓度为5 mg/kg时,佛甲草的Cd富集系数最大,为蜈蚣草的39.43倍,且根和茎Cd浓度分别为65.79 mg/kg和108.11 mg/kg,分别可用堆肥法和水热转化法进行资源化再利用;因此推荐栽种佛甲草对轻工业区排污口周边河床Cd污染进行修复.Cd浓度为8 mg/kg时,肾蕨和龙葵的Cd富集系数最大,分别为蜈蚣草的37.10倍和36.26倍,且龙葵茎、肾蕨叶和龙葵叶、肾蕨茎分别可用堆肥法和水热转化法进行资源化再利用;因此推荐栽种肾蕨对重工业区排污口周边河床Cd污染进行修复,混合栽种肾蕨和龙葵对化学工业集中区周边河床Cd污染进行修复.
In order to study the phytoremediation effect of Cd pollution in the riverbed soil around the sewage outfall,based on the Cd concentrationof the riverbed soil near the sewage outfall in the typical area along the Fujiang River in Mianyang City,the effects of six typical plants,namely Solanum nigrum L,Phytolacca acinosa Roxb,Nephrolepis auriculata(L.),Pogonatherum crinitum(Thunb.)Kunth,Pteris vittata L and Sedum lineare Thunb,on the Cd concentration in the soil with different pollution levels(3 mg/kg,5 mg/kg and 8 mg/kg)and the Cd concentration in different parts of the plant(root,stem and leaf)after planting were studied,to explore the remediation effects of different plants on different Cd polluted soils.The research results show that:When the concentration of Cd in the soil was 3 mg/kg,the Cd enrichment coefficient of Solanum nigrum L and Sedum lineare Thunb was the largest,which were 18.18 times and 20.54 times that of Pteris vittata L respectively;The Cd concentrations in the stem and leaf of Solanum nigrum L and the root and stem of Sedum lineare Thunb are 26.18 mg/kg,40.26 mg/kg,34.38 mg/kg and 49.45 mg/kg,respectively,which can be recycled by composting;Therefore,it is recommended to plant Solanum nigrum L or Sedum lineare Thunb to repair the Cd pollution in the riverbed around the sewage outlet in the urban residential area.When the concentration of Cd was 5 mg/kg,the Cd enrichment coefficient of Sedum lineare Thunb was the largest,which was 39.43 times that of Pteris vittata L;The concentration of Cd in roots and stems was 65.79 mg/kg and 108.11 mg/kg,respectively,which could be reused by composting and hydrothermal transformation;Therefore,it is recommended to plant Sedum lineare Thunb to repair the Cd pollution in the riverbed around the sewage outlet of the light industry zone.When the concentration of Cd was 8 mg/kg,the Cd enrichment coefficients of Nephrolepis auriculata(L.)and Solanum nigrum L were the largest,which were 37.10 times and 36.26 times of Pteris vittata L respectively;And the stem of S
作者
李静宇
熊奉奎
党秀丽
LI Jing-yu;XIONG Feng-kui;DANG Xiu-li(College of Land and Environment,National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources,Northeast Key Laboratory of Conservation and Improvement of Cultivated Land,Ministry of Agriculture and Rural Affairs,Shenyang Agricultural University,Shenyang 110866,China;College of Mechanical and Electrical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
北大核心
2023年第2期31-39,共9页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51876109)
国家重点研发计划项目子课题(2017YFD0801103-3)。
关键词
排污口周边河床
重金属镉
植物修复
资源化再利用
土壤
riverbed around the sewage outlet
heavy metal cadmium
phytoremediation
resource reuse
soil
