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Forest and Grassland Resources Research >

2020 , Vol. 0 >Issue 1: 92 - 101

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2020.01.012

Scientific Research

Pollution Status and Potential Ecological Risk Assessment of Heavy Metals in Soils of Guanzhuang Lake Wetland in Liling

  • Qianyi YONG ,
  • Jiale Tang ,
  • Chonghua PENG
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  • School of Landscape Architecture,Central South University of Forestry and Technology,Changsha 410004

Received date: 2019-11-01

  Revised date: 2019-12-15

  Online published: 2020-05-18

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Abstract

In order to understand the current status of heavy metal enrichment in wetland soils,explore the solutions,which will provide a scientific basis for pollution prevention and control measures,through the system investigation,sampling,testing and research the Guanzhuang lake wetland soil in three different soil types (natural soil,seasonal soil,constant flooding soil) 0 ~ 20 cm soil layer of copper (Cu),zinc (zinc),lead (Pb),cadmium (Cd),chromium (Cr) and the content of heavy metal.Through Hakanson potential ecological hazard index method,pollution load index,heavy metal pollution of wetland soil and potential ecological risk were analyzed.The results showed that(1)in the three types of soil,except for Zn in the natural soil and Cr in the frequently flooded soil,the average content of other heavy metals exceeded the background value of the soil in Hunan province to varying degrees,and Cd in the natural soil exceeded 52.2 times of the background value.(2)in the three types of soil,Cd reaches the level of heavy pollution,Cr is in the safe range,and the other three heavy metals reached the warning limit in the constantly flooded soil.(3)the regional pollution load index of soil was 2.42,2.55 and 2.22 in natural,seasonal and often flooded soil,respectively,which were all moderate pollution levels.The contribution rate of Cd is the largest,reaching more than 75% in all three types of soil.(4)the potential ecological hazard of natural soil is the most serious,reaching 429.28,belonging to the situation of strong potential ecological risk,followed by seasonal flooding,and the lowest under constant flooding.Among them,Cd is the element that poses the greatest potential threat to the ecological environment,reaching a high risk level,while other elements are at a slight risk level.It can be seen that heavy metal pollution in the soil has caused a very serious impact on the environmental maintenance of Guanzhuang lake wetland in Liling.The soil and surrounding environment of LilingGuanzhuang lake wetland urgently need comprehensive improvement.

Key words： wetland soil; soil pollution; soil evaluation; heavy metals; potential ecological; risk assessment; Guanzhuang Lake; Liling

Cite this article

Qianyi YONG , Jiale Tang , Chonghua PENG . Pollution Status and Potential Ecological Risk Assessment of Heavy Metals in Soils of Guanzhuang Lake Wetland in Liling[J]. Forest and Grassland Resources Research, 2020 , 0(1) : 92 -101 . DOI: 10.13466/j.cnki.lyzygl.2020.01.012

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