Heavy metal changes related to land use changes in a karst area: a case study in Changshun, Guizhou Province, China

IF 3.3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Frontiers in Environmental Science Pub Date : 2024-09-18 DOI:10.3389/fenvs.2024.1471160

Xin Jiang, Xingfu Wang, Yi Liu, Yu Huang, Xianfei Huang

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Abstract

Karst areas are often characterized by fragile ecological systems, and environmental pollution has increased the pressures on people living in such regions. This study aimed to investigate the status of pollution caused by heavy metals (Pb, Cd, Hg, As, and Cu) in soils based on different land uses in Changshun County, a karst area in southwestern China. Soil samples were collected from natural forestlands (NFLs), natural brush lands (NBLs), natural pasture lands (NPLs), artificial forestlands (AFLs), artificial brush lands (ABLs), and artificial pasture lands (APLs) for evaluation. The results suggest that the soil profile characteristics of the heavy metals studied herein vary significantly among different land uses. The heavy metal concentrations in all soil samples collected from NFLs were lower than those in samples from other land uses. Forest trees can protect soil from heavy metal pollution caused by atmospheric deposition; this is especially true for Hg. In cultivated forestlands and brush lands, special attention should be devoted to Cd pollution in the soil, which may be caused by the use of fertilizers. Changing both natural and artificial pastoral lands to forestlands could benefit the local ecosystems as it may reduce Hg contamination.

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与岩溶地区土地利用变化有关的重金属变化：中国贵州省长顺县的一项案例研究

岩溶地区通常具有生态系统脆弱的特点，环境污染增加了该地区居民的生活压力。本研究旨在调查中国西南岩溶地区长顺县不同土地利用条件下土壤中重金属（铅、镉、汞、砷和铜）的污染状况。研究人员从天然林地（NFLs）、天然灌木丛地（NBLs）、天然草场（NPLs）、人工林地（AFLs）、人工灌木丛地（ABLs）和人工草场（APLs）采集土壤样品进行评估。结果表明，本文所研究的重金属在不同土地用途的土壤剖面特征有很大差异。从非林地采集的所有土壤样本中的重金属浓度均低于其他土地用途的样本。林木可以保护土壤免受大气沉降造成的重金属污染；对于汞来说尤其如此。在开垦的林地和灌木丛中，应特别注意土壤中的镉污染，这可能是使用化肥造成的。将天然牧场和人工牧场改为林地可减少汞污染，有利于当地的生态系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Environmental Science Environmental Science-General Environmental Science

CiteScore

4.50

自引率

8.70%

发文量

2276

审稿时长

12 weeks

期刊介绍： Our natural world is experiencing a state of rapid change unprecedented in the presence of humans. The changes affect virtually all physical, chemical and biological systems on Earth. The interaction of these systems leads to tipping points, feedbacks and amplification of effects. In virtually all cases, the causes of environmental change can be traced to human activity through either direct interventions as a consequence of pollution, or through global warming from greenhouse case emissions. Well-formulated and internationally-relevant policies to mitigate the change, or adapt to the consequences, that will ensure our ability to thrive in the coming decades are badly needed. Without proper understanding of the processes involved, and deep understanding of the likely impacts of bad decisions or inaction, the security of food, water and energy is a risk. Left unchecked shortages of these basic commodities will lead to migration, global geopolitical tension and conflict. This represents the major challenge of our time. We are the first generation to appreciate the problem and we will be judged in future by our ability to determine and take the action necessary. Appropriate knowledge of the condition of our natural world, appreciation of the changes occurring, and predictions of how the future will develop are requisite to the definition and implementation of solutions. Frontiers in Environmental Science publishes research at the cutting edge of knowledge of our natural world and its various intersections with society. It bridges between the identification and measurement of change, comprehension of the processes responsible, and the measures needed to reduce their impact. Its aim is to assist the formulation of policies, by offering sound scientific evidence on environmental science, that will lead to a more inhabitable and sustainable world for the generations to come.