Factors affecting the geochemistry of rare earth elements in soils in tropical rain and montane forests in Sri Lanka across an elevation gradient

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2024-10-21 DOI:10.1007/s12665-024-11918-2

Nishika Samarakoon, Rohana Chandrajith, Saman K. Herath, Kasun S. Bandara, Janendra De Costa

{"title":"Factors affecting the geochemistry of rare earth elements in soils in tropical rain and montane forests in Sri Lanka across an elevation gradient","authors":"Nishika Samarakoon, Rohana Chandrajith, Saman K. Herath, Kasun S. Bandara, Janendra De Costa","doi":"10.1007/s12665-024-11918-2","DOIUrl":null,"url":null,"abstract":"<div><p>Studying the distribution of rare earth elements (REE) in the soil is crucial for understanding how natural factors influence the geochemical behaviour of such components in tropical lowland rainforests (TLRF) and tropical montane forests (TMF) that are differentiated based on their elevational range and floristics. Since little is known about REE in forest soils in Sri Lanka, eight (8) forest areas along an elevation gradient were investigated to determine the abundance of REE and its relationship to soil physicochemical properties, climatic factors, and vegetation parameters. Sampling was carried out over an area of a one-hectare plot; 17 representative soil samples were taken to a depth of 25 cm, and the REE content was quantified using ICP-MS. The mean REE content varied in all forest plots in the order Ce > La > Nd > Pr > Gd > Sm > Dy > Er > Tb > Yb > Eu > Ho > Lu > Tm. Higher light REE content (La-Nb) with depleted Eu content was a key feature in the forest soils. Altitude showed significant (<i>p</i> < 0.05) relationships with all studied parameters except clay content and heavy rare earth metal contents. The REE contents showed significant positive correlations (<i>p</i> < 0.05) with climatic factors such as precipitation and average temperature, as well as the vegetation parameters such as the Shannon-Wiener Vegetation Diversity Index and above-ground biomass. The results of this study highlight the significant influence of climate and vegetation on REE geochemistry. Further studies are required to elucidate the clay mineral adsorption of REE in forest soils of Sri Lanka.</p></div>","PeriodicalId":542,"journal":{"name":"Environmental Earth Sciences","volume":"83 21","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Earth Sciences","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s12665-024-11918-2","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Studying the distribution of rare earth elements (REE) in the soil is crucial for understanding how natural factors influence the geochemical behaviour of such components in tropical lowland rainforests (TLRF) and tropical montane forests (TMF) that are differentiated based on their elevational range and floristics. Since little is known about REE in forest soils in Sri Lanka, eight (8) forest areas along an elevation gradient were investigated to determine the abundance of REE and its relationship to soil physicochemical properties, climatic factors, and vegetation parameters. Sampling was carried out over an area of a one-hectare plot; 17 representative soil samples were taken to a depth of 25 cm, and the REE content was quantified using ICP-MS. The mean REE content varied in all forest plots in the order Ce > La > Nd > Pr > Gd > Sm > Dy > Er > Tb > Yb > Eu > Ho > Lu > Tm. Higher light REE content (La-Nb) with depleted Eu content was a key feature in the forest soils. Altitude showed significant (p < 0.05) relationships with all studied parameters except clay content and heavy rare earth metal contents. The REE contents showed significant positive correlations (p < 0.05) with climatic factors such as precipitation and average temperature, as well as the vegetation parameters such as the Shannon-Wiener Vegetation Diversity Index and above-ground biomass. The results of this study highlight the significant influence of climate and vegetation on REE geochemistry. Further studies are required to elucidate the clay mineral adsorption of REE in forest soils of Sri Lanka.

查看原文本刊更多论文

跨海拔梯度影响斯里兰卡热带雨林和山地森林土壤中稀土元素地球化学的因素

研究稀土元素（REE）在土壤中的分布，对于了解自然因素如何影响热带低地雨林（TLRF）和热带山地森林（TMF）中此类成分的地球化学行为至关重要。由于人们对斯里兰卡森林土壤中的 REE 知之甚少，因此我们沿海拔梯度对八（8）个林区进行了调查，以确定 REE 的丰度及其与土壤理化性质、气候因素和植被参数的关系。采样工作在一块一公顷的地块上进行；采集了 17 个深度为 25 厘米的代表性土壤样本，并使用 ICP-MS 对 REE 含量进行了量化。所有林地的平均 REE 含量依次为 Ce > La > Nd > Pr > Gd > Sm > Dy > Er > Tb > Yb > Eu > Ho > Lu > Tm。森林土壤的一个主要特征是轻型 REE（La-Nb）含量较高，而 Eu 含量较低。除粘土含量和重稀土金属含量外，海拔高度与所有研究参数均有明显关系（p < 0.05）。稀土金属含量与降水量和平均气温等气候因素以及香农-维纳植被多样性指数和地上生物量等植被参数呈显著正相关（p < 0.05）。本研究的结果凸显了气候和植被对 REE 地球化学的重要影响。还需要进一步研究，以阐明斯里兰卡森林土壤中粘土矿物对 REE 的吸附情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.