重庆某地质高背景区土壤重金属富集特征与污染风险
Enrichment Characteristics and Pollution Risks of Heavy Metals in Soils with High Geochemical Background in Chongqing City
查看参考文献37篇
|
文摘
|
土壤重金属污染是我国的重要环境问题,西南地区是我国典型的地质高背景区,土壤重金属富集引起的环境问题备受关注。前期研究发现渝东北部分地区存在重金属异常富集现象,但对重金属的区域分布特征与污染风险的认识不足。因此,本研究选择城巴断裂带以南的区域为研究区,研究了土壤地球化学组成、重金属分布特征、典型农产品镉污染风险。结果表明:研究区为典型的地质高背景区,土壤中镉(Cd) 、砷(As)等多种重金属富集,其中Cd的富集程度最高,是研究区土壤潜在污染风险最高的重金属,54.4%的样本Cd含量超过农用地土壤污染风险筛选值。土壤Cd的富集主要与母岩地球化学继承性有关,呈明显的局域异常富集特征,高pH和有机质有利于Cd的富集;而受母岩地球化学异质性的影响,研究区土壤Cd的富集机制与纯碳酸盐岩区存在差异。研究区主要农产品中Cd的富集程度较低,整体超标率为5.97%,核桃和红薯未超标,土豆超标率低,玉米超标率相对较高,土壤Cd整体呈现"高含量、低风险"的特征。研究结果可为区域土壤重金属污染风险防控提供参考。 |
|
其他语种文摘
|
Heavy metal pollution is one of the most important environmental issues in China. Southwest China is a typical region with the high geochemical background, where environmental problems result from enrichment of heavy metals in soil was widely concerned. In previous studies, abnormal enrichment of heavy metals in soils was observed in the northeast region of Chongqing City. However, the spatial distribution and pollution risks of heavy metals on a regional scale are not well documented. Therefore, in this study, the southern area of Chengkou-Bashan fault zone was selected as the study area, to investigate the geochemical composition and spatial distribution of heavy metals in soils, and to evaluate the pollution risks of heavy metals in main agricultural products. The results show that the study area is a typical region with high geochemical background, where Cd, As and other heavy metals are enriched in local soils. Cd presents the highest risk among the heavy metals in soils and about 54.4% of soil samples have Cd concentrations exceeding the risk screening values for soil contamination of agricultural land in China. The geochemical composition of parent rocks is the major factor that controls Cd distribution in collected soils, which present high enrichment in some regions with black shale. High pH and TOC favor enrichment of Cd in soils. However, geochemical heterogeneity of bedrocks makes enrichment mechanisms of Cd in local soils slightly different from the typical carbonate regions. Although Cd is enriched in soils, the concentrations of Cd in main agricultural products are relatively low. Only 5.97% of collected food crops exceed the safety threshold of foodstuff, Cd in walnut and sweet potato are lower than the threshold, a low percentage of potato and a relatively high percentage of maize exceed the threshold. These results indicated that Cd in soils of the study area presents a characteristic of high concentration but low pollution risks. The findings of this study provide guidelines for pollution prevention and control of heavy metals in local soils. |
|
来源
|
地球与环境
,2023,51(3):299-307 【核心库】
|
|
DOI
|
10.14050/j.cnki.1672-9250.2022.050.085
|
|
关键词
|
地质高背景
;
镉
;
土壤
;
农作物
;
黑色岩系
|
|
地址
|
1.
重庆市地质矿产勘查开发局205地质队, 重庆, 401120
2.
重庆地质矿产研究院, 重庆, 401120
3.
重庆大学环境与生态学院, 重庆, 401331
4.
重庆市地质调查院, 重庆, 401120
5.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1672-9250 |
|
学科
|
地质学 |
|
基金
|
重庆市规划和自然资源局地调科研项目
;
国家自然科学基金项目
;
中国科学院青年创新促进会专项项目
|
|
文献收藏号
|
CSCD:7460052
|
参考文献 共
37
共2页
|
|
1.
环境保护部.
全国土壤污染状况调查公报,2014
|
CSCD被引
404
次
|
|
|
|
|
2.
国土资源部中国地质调查局.
中国耕地地球化学调查报告,2015
|
CSCD被引
11
次
|
|
|
|
|
3.
袁道先. 中国西南部的岩溶及其与华北岩溶的对比.
第四纪研究,1992,12(4):352-361
|
CSCD被引
28
次
|
|
|
|
|
4.
胡瑞忠. 扬子地块西南缘大面积低温成矿时代.
矿床地质,2007,26(6):583-596
|
CSCD被引
61
次
|
|
|
|
|
5.
Xia X Q. Cadmium risk in the soil-plant system caused by weathering of carbonate bedrock.
Chemosphere,2020,254:126799
|
CSCD被引
11
次
|
|
|
|
|
6.
Wen Y B. Enrichment and source identification of Cd and other heavy metals in soils with high geochemical background in the Karst region, Southwestern China.
Chemosphere,2020,245:125620
|
CSCD被引
25
次
|
|
|
|
|
7.
Wen Y B. Evaluation of various approaches to predict cadmium bioavailability to rice grown in soils with high geochemical background in the Karst region, Southwestern China.
Environmental Pollution,2020,258:113645
|
CSCD被引
16
次
|
|
|
|
|
8.
Yang Q. Transferability of heavy metal(loid)s from karstic soils with high geochemical background to peanut seeds.
Environmental Pollution,2022,299:118819
|
CSCD被引
3
次
|
|
|
|
|
9.
杨琼. 中国广西岩溶地质高背景区土壤-水稻系统Cd等重金属生态风险评价.
中国科学:地球科学,2021,51(8):1317-1331
|
CSCD被引
22
次
|
|
|
|
|
10.
罗慧. 中国南方喀斯特集中分布区土壤Cd污染特征及来源.
生态学杂志,2018,37(5):1538-1544
|
CSCD被引
47
次
|
|
|
|
|
11.
Liu Y Z. Geogenic pollution, fractionation and potential risks of Cd and Zn in soils from a mountainous region underlain by black shale.
Science of the Total Environment,2021,760:143426
|
CSCD被引
6
次
|
|
|
|
|
12.
Duan Y R. Geogenic cadmium pollution in multi-medians caused by black shales in Luzhai, Guangxi.
Environmental Pollution,2020,260:113905
|
CSCD被引
5
次
|
|
|
|
|
13.
杨寒雯. 喀斯特高镉地质背景区水稻镉的富集、转运特征与机理.
地球与环境,2021,49(1):18-24
|
CSCD被引
14
次
|
|
|
|
|
14.
Ni S Q. Enrichment of heavy metal elements and their adsorption on iron oxides during carbonate rock weathering process.
Progress in Natural Science,2009,19(9):1133-1139
|
CSCD被引
1
次
|
|
|
|
|
15.
重庆市规划和自然资源局.
重庆市土地质量地质调查技术指南(1:50 000),2020
|
CSCD被引
1
次
|
|
|
|
|
16.
中华人民共和国国土资源部.
多目标区域地球化学调查规范(1:250 000),2014
|
CSCD被引
1
次
|
|
|
|
|
17.
Norton S A. Acid rain-Acidification and recovery.
Treatise on Geochemistry,2014:379-414
|
CSCD被引
1
次
|
|
|
|
|
18.
刘意章. 西南高镉地质背景区农田土壤与农作物的重金属富集特征.
环境科学,2019,40(6):2877-2884
|
CSCD被引
70
次
|
|
|
|
|
19.
侯青叶.
中国土壤地球化学参数,2020
|
CSCD被引
27
次
|
|
|
|
|
20.
王世杰. 碳酸盐岩风化成土作用的初步研究.
中国科学D辑,1999,29(5):441
|
CSCD被引
211
次
|
|
|
|
|
了解气象卫星更多信息，请访问