生态学杂志2024，Vol.43Issue(6)：1807-1816,10.DOI:10.13292/j.1000-4890.202406.038
基于PCA-APCS-MLR模型的西藏扎西岗湿地土壤重金属风险评价及来源解析
Soil heavy metal risk evaluation and source analysis of Zhaxigang wetland in Tibet based on PCA-APCS-MLR Model
摘要
Abstract
Zhaxigang wetland is a typical plateau meadow swamp and an important ecological function reserve in Lhasa.Wetlands in Tibet are extremely fragile due to climate and topography,which should be given full considera-tion.To accurately assess the pollution status and sources of heavy metals in the soil of Zhaxigang wetland,we ana-lyzed the contents of seven heavy metal elements(Cr,Ni,Zn,Pb,Cd,As and Hg)in 18 surface soil samples of Zhaxigang wetland.The pollution risks of heavy metals were evaluated by using the method of geo-accumulation in-dex(Igeo)and pollution loading index(PLI).Based on PCA,the APCS-MLR model was used to analyze the pol-lution sources of heavy metals.The results showed that:(1)The contents of Cr and Ni in the surface soil of Zhaxi-gang wetland were lower than the background value of Tibetan soil.The contents of the other five elements were ac-cumulated in different degrees.Except for Cd and As,the measured values of the other five elements were lower than the risk screening value in"Soil Environmental Quality Risk Control Standard for Soil Contamination of Agri-cultural Land of(GB 15618-2018)".(2)Except for Cd and Hg,the Igeovalues of other elements were less than 0,indicating a clean level.The overall PLI in the study area was 1.44,indicating light ecological hazard.Both evaluations showed that Cd and Hg were the main pollution elements in this area.More attention should be paid on those two elements,and routine monitoring should be strengthened.(3)The sources of heavy metals were mainly mixed industrial-transportation sources,natural sources,and mixed agricultural-coal combustion sources.Ni,Zn,Pb,Cd,and As were mainly from mixed industrial-transportation sources,Cr was mainly from natural sources,and the sources of Hg were mainly affected by human activities such as agriculture and coal combustion.关键词
扎西岗湿地/沉积物重金属/污染评价/绝对主成分得分-多元线性回归模型Key words
Zhaxigang wetland/sediment heavy metal/pollution assessment/APCS-MLR model引用本文复制引用
杨崛园,熊健,李伟,黄瑞卿,杨博,谢鹏程..基于PCA-APCS-MLR模型的西藏扎西岗湿地土壤重金属风险评价及来源解析[J].生态学杂志,2024,43(6):1807-1816,10.基金项目
西藏自治区科技计划项目(XZ202101ZY0012G,XZ202202YD0027C和XZ202301ZY0020G)、国家重点研发计划"固废资源化"重点专项(2019YFC1904100)、西藏大学人才发展激励计划——青年学者项目和中央支持地方高校专项资金(藏财预指[2023]01、[2024]01)资助. （XZ202101ZY0012G,XZ202202YD0027C和XZ202301ZY0020G）
