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广东省揭阳市土壤铬的空间结构及分布特征研究
王涵植1, 温汉辉2, 蔡立梅1, 罗 杰1, 穆桂珍1, 王秋爽1, 蒋慧豪1, 王 硕1
1.长江大学油气资源与勘探技术教育部重点实验室,长江大学资源与环境学院;2.广东省有色金属地质局940队
摘要:
开展对广东省揭阳市土壤Cr的调查研究,系统采集了表层土壤样(0~20 cm)1330个和深层土壤样(> 150 cm)331个,测定表层和深层土壤Cr含量,并据此研究该地区Cr的空间结构及分布特征。利用富集因子法分析了Cr的污染状况,结合Geoda、GS+等软件分析了Cr的结构特征、Moran指数与空间集聚效应,GIS空间分析技术和方差分析对Cr的空间含量分布以及影响因素进行了研究。结果表明,揭阳市土壤Cr不存在明显的污染状况,表层土壤平均Cr含量为22.39mg/kg,低于揭阳市土壤背景值27.88mg/kg,远低于广东省土壤背景值50.50mg/kg。富集因子表明研究区土壤Cr污染程度多为无污染和轻微污染,分别占到75.11%和23.46%,Moran指数值为0.52,表明研究区有正相关集聚,“热点”主要分布在榕城区及揭东区的东南部、揭西县的中南部、惠来县的北部以及西南部;“冰点”主要分布在揭西县的西南部以及惠来县南边沿海地区,这与Cr含量的空间分布特征基本一致。土壤Cr主要受到成土母质的影响,成土母质为粉砂岩和页岩中的Cr含量较高,沙性母质中的Cr含量较低,不同土壤类型中水稻土Cr含量较高,风沙土含量较低,不同土地利用方式下的Cr含量差异不明显,Cr含量并未受到人为活动的明显影响。
关键词:  土壤铬  空间结构  分布特征  影响因素  揭阳市
DOI:10.13758/j.cnki.tr.2020.05.010
分类号:X825
基金项目:国家自然科学基金项目(41203061)、教育部油气资源勘探技术重点实验室开放基金项目(K2018-19)、湖北省自然科学基金项目(2015CFB603)、湖北省教育厅科学技术研究重点项目(D20161301)、有机地球化学国家重点实验室开放基金项目(OGL-201408)和长江大学大学生创新创业训练项目(2016006,2017223)资助。
Spatial Structure and Distribution of Soil Chromium in Jieyang City, Guangdong Province
WANG Hanzhi1, WEN Hanhui2, CAI Limei1, LUO Jie1, MU Guizhen1, WANG Qiushuang1, JIANG Huihao1, WANG Shuo1
1.Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Ministry of Education, College of Resources and Environment, Yangtze University;2.Non-ferrous Metals Geological Bureau 940 Team, Guangdong Province
Abstract:
A systematic investigation of soil chromium in the region of Jieyang City was carried out, 1330 samples of surface soil and 331 samples of deep soil were collected systematically and analyzed for content, spatial structure and distribution characteristics of Cr. The enrichment factor method was utilized to analyze the pollution status of Cr, the structural characteristics, Moran index and spatial agglomeration effect. Cr were analyzed by software such as Geoda and GS+, the spatial distribution and influence factors of Cr were analyzed by GIS spatial analysis and variance analysis technique. The results showed that there was no obvious pollution status of soil Cr in study area, the average Cr content of surface soil was 22.39mg/kg, which was lower than the soil background value of 27.88mg/kg in Jieyang City, and much lower than the soil background value of 50.50mg/kg in Guangdong Province. The enrichment factor method showed that the degree of Cr pollution in the study area was mostly non-polluting and slight pollution, accounting for 75.11% and 23.46%, respectively. The Moran index value was 0.52, indicating that the study area had positive correlation aggregations. The “hot spots” were mainly distributed in the southeastern part of Rongcheng, Jiedong district, the south-central part of Jiexi county, the north and southwest of Huilai county; the “ice spots” were mainly distributed in the southwest of Jiexi county and the coastal area south of Huilai county, which were basically consistent with the spatial distribution characteristics of Cr content. The soil Cr was mainly affected by the parent material, with higher Cr content in siltstone and shale, and lower content in the sandy parent material. The content of Cr in paddy soil was higher in different soil types, and the content of sandy soil was lower. The difference in Cr content under different land use patterns was not obvious, and the Cr content was not significantly affected by human activities.
Key words:  Soil Cr  Spatial structure  Distribution characteristics  Influencing factor  Jieyang City

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