Geochemical characteristics and environmental significance of rare earth elements in representative coffee-producing areas of Yunnan Province

doi:10.14088/j.cnki.issn0439-8114.2026.03.008

Abstract

Abstract: To investigate the geochemical behavior of rare earth elements and ensure ecological safety, a total of 120 surface soil samples were collected from coffee plantations at different altitudes and cultivation durations in Yunnan Province. Using geochemical analysis methods, the content, fractionation characteristics, and environmental significance of rare earth elements in soils from typical coffee-producing areas were systematically studied. The results showed that the average of total rare earth element content in soil samples from each coffee-producing areas was higher than the national background value of rare earth elements (163.86 mg/kg), and also exceeded the upper continental crust (UCC) value (150.68 mg/kg). The anomaly values of Ce (δ_Ce) and Eu (δ_Eu) in soils from different coffee-producing areas were significantly different. The δ_Ce ranged from 0.74 to 1.87, with an average value of 1.08. Normal δ_Ce values accounted for 61.98% of the total samples, and no marked positive anomaly was observed. δ_Eu ranged from 0.42 to 0.82, with an average of 0.56, showing a depletion trend. The ratio of light rare earth elements to heavy rare earth elements (LREE/HREE) in the study area ranged from 7.30 to 15.87, with an average of 10.67, indicating that light rare earth elements were relatively more enriched compared to heavy rare earth elements. There was a generally strong positive correlation among rare earth elements, while most rare earth elements showed weak negative correlations with organic matter. Light rare earth elements exhibited weak positive correlations with pH, whereas most heavy rare earth elements showed weak negative correlations with pH. Most rare earth elements had weak negative correlations or no correlation with Ca, and most rare earth elements showed no correlation with K or N. The altitude gradient had a significant control effect on the fractionation of rare earth elements, and there were obvious elevation differentiation characteristics.

Key words: rare-earth elements, soil, geochemical characteristic, environmental significance, representative coffee-producing areas, Yunnan Province

CLC Number:

P618.7
P595

HUANG Qian-rui, ZHOU Xiao-hua, XIANG Yun-gang, HOU Ming-xing, BAO You-xian, LYU Yu. Geochemical characteristics and environmental significance of rare earth elements in representative coffee-producing areas of Yunnan Province[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(3): 50-58.

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