摘要
解决农田土壤镉(Cd)污染及水稻Cd超标问题是国家和地方的重大需求。通过在苏南地区多年多点的田间小区试验和大田实地调查,对当地主栽水稻品种的Cd积累性差异进行比较,并推导出土壤Cd安全阈值。结果表明,大田调查与小区试验结果一致,18个主栽水稻品种糙米Cd生物富集系数存在差异,最高相差4.7倍,南粳46、南粳3908等品种的Cd积累性较低且稳定,建议推广应用。利用物种敏感性分布法,推导出苏南地区土壤pH 5.0~6.5、6.5~7.5、7.5~8.5下保护95%水稻品种糙米不超标的土壤全量Cd安全阈值分别为0.52、0.80、1.78 mg·kg^(-1),均高于现行的风险筛选值(GB 15618-2018)。研究结果对于苏南地区Cd污染稻田安全利用具有重要的应用价值。
【Objective】There are urgent requirements to solve the problem of cadmium(Cd)pollution in farmlands and rice.With the rapid economic development in Southern Jiangsu,Cd pollution in soil and rice caused by industrialization has significantly increased.The purpose of this study was to screen low-Cd-accumulating rice varieties from main cultivated varieties in Southern Jiangsu,and to deduce the local soil Cd threshold for the safe production of rice.【Method】In this study,field plot experiments and field investigation were conducted at different sites and years.Eighteen local main cultivated rice varieties in Southern Jiangsu were selected,including 15 Japonica conventional varieties:Wuyunjing 30(WYJ30),Suxiangjing 100(SXJ100),Changnongjing 10(CNJ10),Nanjing 3908(NJ3908),Nanjing 5055(NJ5055),Changnongjing 12(CNJ12),Nanjing 46(NJ46),Changnongjing 11(CNJ11),Jiahua 1(JH1),Changxiangjing 1813(CXJ1813),Changnongjing 8(CNJ8),Wukejing 7375(WKJ7375),Zaoxiangjing 1(ZXJ1),Yangyujing 3(YYJ3),Zhennuo 19(ZN19),and 3 Japonica three-line hybrid varieties:Changyoujing 6(CYJ6),Changyou 4(CY4)and Changyoujing 11(CYJ11).The differences of Cd bioconcentration factor(BCF)in rice grains among these varieties were comprehensively compared,and the soil Cd safety thresholds at different pH ranges were deduced using the species sensitivity distribution(SSD)method.【Result】The results showed that the order of grain Cd accumulation among tested varieties was consistent between field investigation and plot experiments.There were significant differences in Cd BCF among 18 main cultivated rice varieties,with a maximum difference of 4.7 times.The Cd accumulation in some varieties like NJ46 and NJ3908 was stably low.Based on the SSD method,the deduced safety thresholds of soil total Cd to protect 95%of rice varieties from exceeding the standard(0.2 mg·kg^(-1))(GB 2762-2017)under soil pH 5.0-6.5,6.5-7.5 and 7.5-8.5 in southern Jiangsu were 0.52,0.80 and 1.78 mg·kg^(-1),which were higher than the current risk screening value(GB 15618-2018)
作者
涂峰
胡鹏杰
李振炫
张绪美
潘云俊
孔呈
孙永泉
邱一格
吴龙华
骆永明
TU Feng;HU Pengjie;LI Zhenxuan;ZHANG Xumei;PAN Yunjun;KONG Cheng;SUN Yongquan;QIU Yige;WU Longhua;LUO Yongming(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;Taicang Agricultural Technology Extension Center,Taicang,Jiangsu 215400,China;Changshu Cultivated Land Quality Protection Station,Changshu,Jiangsu 215500,China;Xiangcheng District Modern Agricultural Development Center of Suzhou City,Suzhou,Jiangsu 215131,China;Suzhou Cultivated Land Quality Protection Station,Suzhou,Jiangsu 215011,China;Ecological Environment Monitoring&Supervising Co.,Ltd.of Jiangsu Province,Nanjing 210019,China)
出处
《土壤学报》
CAS
CSCD
北大核心
2023年第2期435-445,共11页
Acta Pedologica Sinica
基金
国家自然科学基金项目(41977135)
相城区耕地质量提升项目(ZYT2019-XC-G-010)
常熟市耕地质量提升项目(JSJY-Z2021D002)
太仓市重点研发计划项目(TC2018SF06)共同资助。
关键词
水稻土
镉
低积累品种
土壤PH
安全阈值
Paddy soil
Cd
Low accumulating varieties
Soil pH
Safety threshold
