基于物种敏感性分布(SSDs)的土壤硒生态基准值推导  

Derivation of soil ecological criteria of selenium based on species sensitivity distributions(SSDs)

作　　者：王靖菡 许秋云 王婷[2] 张强斌[1,4] 史雅娟[2,3] 钱力 周譞 柯玲杰 WANG Jinghan;XU Qiuyun;WANG Ting;ZHANG Qiangbin;SHI Yajuan;QIAN Li;ZHOU Xuan;KE Lingjie(College of Chemical Engineering and Environment,China University of Petroleum,Beijing 102249;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing100085;University of Chinese Academy of Sciences,Beijing 100049;Beijing Key Laboratory of Oil and Gas Pollution Control,China University of Petroleum,Beijing 102249)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,北京102249 [2]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [3]中国科学院大学,北京100049 [4]中国石油大学(北京)油气污染防治北京市重点实验室,北京102249

出　　处：《环境科学学报》2023年第3期459-465,共7页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2018YFC1801103);国家自然科学基金(No.41977360);International Partnership Program by the ChineseAcademy of Sciences(No.121311KYSB20190029)。

摘　　要：土壤中过量的硒会对土壤生物造成毒害效应,然而目前我国还未制定用于土壤生态系统健康保护的生态标准.本研究通过搜集土壤硒的毒理数据,并根据不同的效应终点对其进行筛选,分别推导对5%物种危害的浓度(Hazardous Concentration for 5%of species,HC_(5)).以20%效应浓度(20%Effect Concentration,EC_(20))、25%效应浓度(25%Effect Concentration,EC_(25))和最低观察效应浓度/水平(Lowest Observed Effect Concentration/Level,LOEC/LOEL)等为效应终点的毒理数据进行一级HC_(5)值的推导,以半数效应浓度(Half Effect Concentration,EC_(50))和半数致死效应浓度(Half Lethal Concentration,LC_(50))等为效应终点的毒理数据进行二级HC_(5)值的推导.物种敏感性分布(Species Sensitivity Distribution,SSDs)曲线由5种函数(Burr Ⅲ、Log-Logistic、Log-Normal、Weibull和Re-Weibull)对分级后的毒理数据分别拟合,并根据偏差信息准则值(Deviance Information Criterion,DIC)确定Burr Ⅲ函数具有最优拟合度.推导出的一级和二级HC_(5)值分别为0.079 mg·kg^(-1)和1.26 mg·kg^(-1).将安全系数和自然背景值考虑在内,得出土壤硒的一级和二级生态基准值分别为0.146 mg·kg^(-1)和0.385 mg·kg^(-1).本研究结果可为我国土壤硒的生态标准制定及其风险评估提供科学依据和支撑.Researches have shown that excessive selenium in soil led to toxic effects on soil organisms.However,there are currently no established ecological criteria for soil selenium to protect soil ecosystem health in China.In this study,the toxicological data of soil selenium were collected and screened by different effect endpoints to derive the corresponding hazardous concentration for 5%of species(HC_(5))respectively.The toxicological data with effect endpoint of 20%effect concentration(EC 20),25%effect concentration(EC_(25))and lowest observed effect concentration/level(LOEC/LOEL)were adopted to derive the HC_(5) value(levelⅠ),and that of half effect concentration(EC_(50))and half lethal concentration(LC_(50))were used to derive the HC_(5) value(levelⅡ).Species sensitivity distribution curves were fitted by five models(Burr Ⅲ,Log Logistic,Log Normal,Weibull and Re-Weibull)with the classified toxicological data,respectively.Burr Ⅲ function showed the best fitting degree by deviance information criterion(DIC)value.The derived HC_(5) values of levelⅠand levelⅡwere 0.079 mg·kg^(-1) and 1.26 mg·kg^(-1).Furthermore,considering the safety factor and natural background value of selenium,the levelⅠand levelⅡecological criteria of selenium in soil were 0.146 mg·kg^(-1) and 0.382 mg·kg^(-1),respectively.The results support the formulation of ecological criteria and risk assessment of soil selenium in China.

关 键 词：土壤 硒 物种敏感性分布 生态基准值 

分 类 号：X171.5[环境科学与工程—环境科学] X53