大宝山多金属矿区土壤-植被稀土元素生物地球化学特征  

REE Biogeochemistry of Soil-Vegetation System in Dabaoshan Polymetallic Mine

作　　者：王娟[1] 王正海[1,2] 耿欣[1] 何凤萍[1] 祖玉川[1] 王磊[1] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275

出　　处：《地球科学（中国地质大学学报）》2014年第6期733-740,共8页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金(No.41072247)

摘　　要：为研究采矿对土壤-植被REE生物地球化学特征的影响,采集大宝山多金属矿区及背景区土壤及优势植物芒萁、马尾松叶片,测量REE含量.对比分析样品中REE分布模式、∑REE、δEu、δCe及四重效应等地球化学特征.结果表明:受采矿活动影响,矿区土壤REE含量均值达284.99mg/kg,显著高于背景区,且表土层REE含量明显高于心土层;相对于背景区,矿区土壤和植被轻重稀土分馏更弱;研究区土壤和植被都为Eu亏损,大都为Ce富集,马尾松与土壤REE含量呈正相关,REE富集植物芒萁在背景区富集系数反而更高;矿区环境抑制植物对REE正常的迁移和分异,对植被生长不利,植被REE分布分异特征是其对生长环境的反映和适应.REE biogeochemistry is important in understanding the occurrence, migration and fractionation of REE and its ecologically environmental effects. In order to explore the REE biogeochemistry of soil-vegetation system in mining affected region, Dabaoshan mine, a typical polymetallic mine, was chosen as a study area. Soils and leaves of dominant Dicranopteris Pedata and Pinus massoniana, from and outside the mine, were collected. Then REE contents were measured by using the ICP- MS. REE distribution patterns, ∑REE, δEu and δCe were analyzed. Results show that mining area, with the mean ∑REE 284. 99 mg/kg, has significantly higher REE contents than outside areas. , In addition, REE contents in epipedon are much higher than those in subsoil due to the effects of mining activity. What＇s more, the fractional degree of HREE and LREE of both soil and plant is much weaker in mining area compared with that outside the mine. The soils and plants collected are all characterized by Eu deficiency and Ce enrichment. And the accumulator Dicranopteris Pedatahas lower REE enrichment coefficient than Pinus massoniana by the presence of heavy metal. Therefore, the mining environment has negative effect on the normal migration and fractionation of REE in soil-vegetation system and growth of plants.

关 键 词：稀土元素 土壤-植被系统 分布 分异 大宝山 地球化学 

分 类 号：P593[天文地球—地球化学]