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中国西南地区沿江地区喀斯特土壤中重金属的空间分布及生态风险评估。

Spatial distribution and ecological risk assessment of heavy metals in karst soils from the Yinjiang County, Southwest China.

机构信息

Institute of Geology and Geophysics, Chinese Academy of Sciences (CAS), Beijing, China.

University of Chinese Academy of Sciences, Beijing, China.

出版信息

PeerJ. 2022 Feb 1;10:e12716. doi: 10.7717/peerj.12716. eCollection 2022.

DOI:10.7717/peerj.12716
PMID:35178289
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8815369/
Abstract

BACKGROUND

Soil heavy metals (HMs) under different land-use types have diverse effects, which may trigger the ecological risk. To explore the potential sources of HMs in karst soils, the spatial distribution and geochemical behavior of HMs based on different land-use types are employed in this study.

METHODS

Soil samples ( = 47) were collected in three suites of karst soil profiles from the secondary forest, abandoned cropland and shrubland in Yinjiang, Southwest China. The concentrations of Ni, Mn, Cr, Pb, Cd and Mo were determined to give a comprehensive understanding of the possible sources of these HMs and evaluate the potential ecological risk in Yinjiang County.

RESULTS

The mean concentrations of HMs in all profiles followed the same order: Mn > Cr > Ni > Pb > Mo > Cd. Meanwhile, the concentrations of most HMs roughly increased with the depth. Additionally, the concentrations of HMs were mostly correlated with soil pH and SOC, rather than with clay and silt proportions. By contrast, with the enrichment factors (EF), geo-accumulation (I) and potential ecological risk index (PERI) of HMs in soil under different land-use types, the results indicated that these HMs exhibited non-pollution (I < 0) and no ecological risk (PERI < 30) to human health in soils of Yinjiang County.

CONCLUSIONS

The distribution of HMs is dominated by weathering in the karst area, and the effects of agricultural inputs on the enrichment of soil HMs in Yinjiang County are limited. This further state that the arrangement of the local agricultural structure is reasonable.

摘要

背景

不同土地利用类型下的土壤重金属（HMs）具有不同的影响，可能引发生态风险。为了探究喀斯特土壤中 HMs 的潜在来源，本研究采用基于不同土地利用类型的 HMs 空间分布和地球化学行为来进行研究。

方法

在西南地区的银江，从次生林、废弃耕地和灌丛中采集了 47 个土壤样本，用于研究土壤剖面。测定了土壤中 Ni、Mn、Cr、Pb、Cd 和 Mo 的浓度，以便全面了解这些 HMs 的可能来源，并评估银江县的潜在生态风险。

结果

所有剖面中 HMs 的平均浓度均遵循相同的顺序：Mn > Cr > Ni > Pb > Mo > Cd。同时，大部分 HMs 的浓度大致随深度增加而增加。此外，HMs 的浓度与土壤 pH 和 SOC 更为相关，而与粘粒和粉粒比例相关性不大。相比之下，通过对不同土地利用类型下土壤中 HMs 的富集因子（EF）、地积累指数（I）和潜在生态风险指数（PERI）的评估，结果表明这些 HMs 在银江县土壤中并未对人类健康造成污染（I < 0）和生态风险（PERI < 30）。

结论

喀斯特地区 HMs 的分布主要受风化作用的影响，农业投入对银江县土壤中 HMs 富集的影响有限。这进一步表明当地农业结构的安排是合理的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/9b6c13fef88a/peerj-10-12716-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/ef696f2cd297/peerj-10-12716-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/617dd3772f26/peerj-10-12716-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/ddce7f9017b7/peerj-10-12716-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/79c5941a25fd/peerj-10-12716-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/18295196131a/peerj-10-12716-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/5674a80dea6b/peerj-10-12716-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/2c4b63c87216/peerj-10-12716-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/9b6c13fef88a/peerj-10-12716-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/ef696f2cd297/peerj-10-12716-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/617dd3772f26/peerj-10-12716-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/ddce7f9017b7/peerj-10-12716-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/79c5941a25fd/peerj-10-12716-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/18295196131a/peerj-10-12716-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/5674a80dea6b/peerj-10-12716-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/2c4b63c87216/peerj-10-12716-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c20/8815369/9b6c13fef88a/peerj-10-12716-g008.jpg

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