摘要
通过野外取样调查和室内ICP-MS测定,研究了福建省长汀县稀土矿治理地土壤和主要植物中稀土元素的含量、分布以及转移特征。结果表明:稀土矿治理地的土壤养分含量较低;土壤中稀土元素的含量为507.40~841.37mg·kg-1,高于对照地土壤的含量。稀土矿治理地土壤中稀土元素主要为交换态,其含量占总量的61%~98%。稀土矿治理地土壤中稀土元素从原来偏单一的交换态转变为多种形态共存,其中有机态含量显著升高。植物根、茎、叶中稀土元素含量分别为40.27~986.01、5.14~206.58、6.81~2364.51mg·kg-1。稀土元素在植物各器官中含量水平除芒萁为叶>根>茎,其他植物均表现为根>叶>茎。根据不同植物吸收和积累稀土元素的差异,可将矿区治理地植物分为富集型和根部囤积型植物。芒萁属于富集型植物,桉树、高羊茅、宽叶雀稗、木荷和油茶属于根部囤积型植物。
Based on filed sampling and laboratory analysis, this paper studied the concentration, distribution, and migration of rare earth elements (REEs) in the soils and dominant plants in recovered mining wastelands in Changting County of Fujian Province. Due to the serious destruction of the soils, their nutrient contents were lower, but the REEs concentrations ranged from 507.40 to 841.37 mg·kg-1, being higher than those of the control. The REEs in the soils were mainly in exchangeable form, accounting for 61%-98% of total. The soil REEs were transformed from single exchangeable form to a variety of fractions, and the concentration of organic fractions increased significantly. The REEs concentrations in plant root, stem, and leaf were 40.27-98601, 5.14-206.58, and 6.81-2364.51 mg·kg-1, respectively. Except that the REEs concentrations in Dicranopteris pedata organs were in the order of leaf 〉 stem 〉 root, those in the other plants organs were in the order of root 〉 leaf 〉 stem. According to the REEs concentrations in shoot and root, the plants could be classified into two types. Dicranopteris pedata was accumulator plant, whereas Eucalyptus spp., Paspalum wettsteinii, Schima superba, and Camellia'sasanqua were rootcompartment plants.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第8期2126-2132,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41171232
41001170)资助
关键词
稀土元素
植物
积累
植被恢复地
rare earth elements
plant
accumulation
vegetation recovery land