Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China

Qian Zhang, Guilin Han, Man Liu and Lingqing Wang
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Qian Zhang: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
Guilin Han: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
Man Liu: School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
Lingqing Wang: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Sustainability, 2019, vol. 11, issue 18, 1-14

Abstract: Soil samples from eight soil profiles under different land-use types were collected at the Puding Karst Critical Zone Observatory, Southwest China, to investigate the distribution, fractionation, and controlling factors of rare earth elements (REEs). The total REEs contents in topsoil ranged from 149.97 to 247.74 mg kg −1 , the contents in most topsoil were higher than local soil background value (202.60 mg kg −1 ), and the highest content was observed in topsoil under cropland. The REEs contents in surface soils from lower slopes sites were higher than that of middle and upper slope sites, and the highest contents were observed in cropland. The PAAS-normalized REEs pattern in soils showed MREEs significantly enriched relative to LREEs and HREEs, and HREEs were enriched relative to LREEs. The results showed that clay content, pH, soil organic carbon, total phosphorus, and Fe content were the main factors influencing the distribution of REEs in karst soils, and soil organic carbon (SOC), Fe content showed better linear relationship with REEs.

Keywords: rare earth elements; land use; soil organic carbon; karst critical zone observatory; southwest china (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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