四川农业大学学报

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茶树与茶园土壤的铅含量及分布特征

速晓娟   

  1. 四川农业大学园艺学院茶学系
  • 收稿日期:2011-10-13 修回日期:2011-11-14 出版日期:2011-12-25 发布日期:2011-12-26
  • 通讯作者: 速晓娟

Lead Content and Distribution Characteristic of Tea Plants (Camellia sinensis) and Soil in Tea Gardens

SU XiaoJuan   

  1. Tea department ,College of Horticulture, Sichuan Agricultural University
  • Received:2011-10-13 Revised:2011-11-14 Online:2011-12-25 Published:2011-12-26
  • Contact: SU XiaoJuan

摘要:

采用火焰原子分光光度法,对不同茶园的茶树树体及其土壤样品的铅含量及其分布进行测定。探讨树体及土壤中铅的分布状况,并以富集系数(BAF)为指标对茶树吸收累积铅的能力进行评价。结果表明,茶树新梢与树体铅含量分别为2.26±0.91mg/kg和9.43±0.40mg/kg;茶树各部位铅含量顺序为:侧根(15.37mg/kg)﹥主根(11.74mg/kg)、叶片(8.50 mg/kg)﹥生产枝(7.25mg/kg)﹥骨干枝(4.28mg/kg),其中根系和叶片吸收累积的铅约占树体的60.42%和7.16%。当土壤全铅和有效态铅含量分别在25.88-55.63mg/kg 和5.21-25.93mg/kg范围内时,不同茶园茶树的各部位铅含量及铅分布率均呈显著差异,茶树体内铅含量与土壤铅含量之间相关性并不显著,这意味着除茶园土壤的铅来源之外,茶树中铅还有其它吸收累积渠道。

关键词: 茶树, 土壤, 铅含量, 富集系数, 分布特征

Abstract:

The Lead (Pb) content of the soil and tea plants(Camellia sinensis) samples from different tea gardens were determined by the FAAS in this paper. The distribution characteristics of Pb content in different parts of tea plants and soil were investigated and the absorption and cumulation ability of Pb by tea plants was evaluated by the enrichment coefficient. The results showed: (1) The Pb concentration of tea shoots and tea plants were 2.26±0.91mg/kg and 9.43±0.40mg/kg;(2) Pb content in different tea plant parts sorted as: side root (15.37mg/kg)>main root(11.74mg/kg), leaves(8.50mg/kg)>production branch(7.25mg/kg)>backbone branch(4.28mg/kg). The Pb content of the tea plants absorbed and cumulated by roots and leaves of the tea plants were 60.42% and 7.19%;(3) The Pb concentration and distribution in tea plants of different tea gardens were significantly different, and there was no significant correlation between the Pb content of major parts of tea plants and the soil when the total Pb or available Pb were 25.88-55.63mg/kg or 5.21-25.93mg/kg in soil , it means that Pb can also be absorbed by other sources besides the soil.

Key words: tea plants, soil, Pb content, enrichment coefficient, distribution characteristic