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广西宁明县海渊镇土地质量地球化学评价 被引量:3

Geochemical Evaluation of Land Quality in Haiyuan Town,Ningming County,Guangxi
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摘要 为了查清广西宁明县海渊镇土地质量地球化学基本状况并提出优质土地资源开发利用建议,本文以第二次全国土地调查成果中的土地利用图斑为评价单元,系统采集了该区土壤及农作物样品,并分析了土壤的养分指标(氮、磷、钾、硒)、环境指标(pH、镉、汞、砷、铜、铅、锌、铬、镍),农作物样品的评价指标(硒和镉、汞、砷、铜、铅、锌、铬、镍),在此基础上参照《土地质量地球化学评价规范》进行了土地质量评价,划分了无污染风险富硒土地。结果表明:该区土壤养分质量较差,综合等级以较缺乏和缺乏为主;土壤环境质量优质,无风险等级土壤占比95.57%;土壤质量一般,评价等级以中等为主,面积124.01 km^(2),占全区总面积的56.28%,主要由土壤养分缺乏导致;水稻样品富硒比例高达66.67%,水稻重金属超标率仅为1.67%,圈定无污染风险富硒土地35.69 km^(2)。上述评价结果可为当地富硒等优质土地开发与农产品安全利用提供重要的地球化学依据。 In order to find out the geochemical land quality and propose suggestions for land use planning,the geochemical evaluation of land quality were systematically carried out in Haiyuan Town,Ningming County,Guangxi.Using the land use patches of the Second National Land Survey as the assessment units,this study has collected samples and classified land quality based on the nutrients of soil samples(content of N,P,K and Se),environmental indexes(pH value,content of Cd,Hg,As,Cu,Pb,Zn,Cr and Ni)and evaluation indicators of agricultural crops samples(content of Se,Cd,Hg,As,Cu,Pb,Zn,Cr and Ni),Nutrient and environmental indexes of paddy samples and the results show that:(1)The geochemical comprehensive grades of soil nutrient in this area ranged mainly from Less Deficient to Deficient;(2)The soil environmental quality was premium,and the soil with Risk-free grade accounted for 95.57%;(3)Since the lack of soil nutrient elements,the main geochemical comprehensive grade of land quality was Medium,which accounted for 56.28%of the studied region;(4)The proportion of Se-rich paddy was as high as 66.67%;Only 1 of 60 paddy samples yielded the Cd content higher than the heavy metals level in paddy.In addition,we located a Se-rich land of 35.69 km^(2)with no heavy metals contamination risks.The evaluation results provided important geochemical basis for the development of selenium-rich high-quality land and safe utilization of agricultural products.
作者 鲍波 雷天赐 姜华 徐宏林 王磊 郝志红 BAO Bo;LEI Tian-Ci;JIANG Hua;XU Hong-Lin;WANG Lei;HAO Zhi-Hong(Wuhan Center,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,Hubei,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,Hebei,China)
出处 《华南地质》 CAS 2022年第4期669-679,共11页 South China Geology
基金 中国地质调查局项目(DD20160327、DD20190540)。
关键词 土地质量 地球化学评价 富硒无污染土地 土地利用建议 广西海渊镇 Land quality geochemical evaluation selenium-rich with no contamination risks land land use planning Haiyuan town Guangxi
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