云南省典型咖啡产区稀土元素的地球化学特征及环境意义

doi:10.14088/j.cnki.issn0439-8114.2026.03.008

摘要/Abstract

摘要： 为研究稀土元素的地球化学行为以保障生态安全,在云南省不同海拔和种植年限的咖啡园中共采集了120个表层土壤样品,通过地球化学分析方法,系统研究了典型咖啡产区土壤中稀土元素的含量、分馏特征及其环境意义。结果表明,各咖啡产区土壤样品稀土元素总含量的均值均高于全国稀土元素背景值（163.86 mg/kg）,也高于上部大陆地壳（UCC）（150.68 mg/kg）。不同咖啡产区土壤的Ce的异常值（δ_Ce）和Eu的异常值（δ_Eu）差异明显,其中δ_Ce为0.74~1.87,平均值为1.08,正常范围占总样本的61.98%,正异常不明显;δ_Eu为0.42~0.82,平均值为0.56,表现为亏损。研究区土壤轻稀土元素含量与重稀土元素含量的比值（LREE/HREE）为7.30~15.87,平均值为10.67,表明轻稀土元素相对于重稀土元素更为富集。稀土元素之间普遍存在强正相关性,大部分稀土元素与有机质呈弱负相关,轻稀土元素与pH呈弱正相关,大部分重稀土元素与pH呈弱负相关,大部分稀土元素与Ca呈弱负相关或不相关,大部分稀土元素与K、N不相关。海拔梯度对稀土元素分馏的控制作用显著,存在明显的高程分异特征。

关键词: 稀土元素, 土壤, 地球化学特征, 环境意义, 典型咖啡产区, 云南省

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

中图分类号:

P618.7
P595

黄茜蕊, 周晓华, 向云刚, 侯明兴, 包又先, 吕玉. 云南省典型咖啡产区稀土元素的地球化学特征及环境意义[J]. 湖北农业科学, 2026, 65(3): 50-58.

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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