摘要
通过测试武夷山19个茶园土壤及茶叶中的Cu、Pb和Mn元素全量及土壤元素化学形态组成,分析土壤三种元素的生物可利用性和茶叶对其富集能力,并研究土壤理化性质对茶叶元素含量的影响。结果表明,武夷茶区土壤和茶叶Cu、Pb和Mn全量属于安全范围内。元素形态中,Cu以残渣态为优势;Pb、Mn以残渣态和铁锰氧化态为主,三者的生物可利用性大小排序为:Pb>Mn>Cu。富集系数比较得出,茶叶对土壤Cu、Mn富集能力较强,Pb的富集系数较低。相关性结果表明,该茶区土壤酸化很可能已经导致了土壤锰在一定量上的淋溶与流失;土壤有机质的增加,促进茶叶对Cu、Mn的吸收、累积,并降低土壤铅的有效性;重元素全量不能充分反映土壤对茶叶的有效性,赋存形态对合理评估土壤对茶叶的有效性更加重要。
In order to fully understand the relationship between fraction distribution of soil heavy metals and tea bioavailability in Wuyishan tea garden, soil and tea leave samples were collected from 19 tea gardens of Wuyishan. Total contents and chemical fractions of heavy metals （Cu, Pb and Mn） were analyzed and the tea bioavailability, the heavy metal enrichment ability of tea plant and the influence of soil physicochemieal properties on tea heavy metal contents were studies. The results showed that the content of Cu, Pb and Mn both of soil and tea leave samples were within the safe range. Cu element was advantaged by residual fraction, and Pb and Mn element were dominated by residual fraction and Fe-Mn oxides fraction. The order of bioavailability of heavy metals （Cu, Pb and Mn） was Pb 〉 Mn 〉 Cu. The comparative analysis of the enrichment ability of Cu, Pb, Mn in tea leaf indicated that Cu and Mn were strong enrichment, and Pb was slight accumulation. The results of correlation analysis suggested that soil acidification of Wuyishan tea garden could lead to a certain degree of leaching and runoff of Mn element. The increase of soil organic matter promoted the absorption and accumulation of Cu and Mn element in tea plant, and reduced the bioavailability of soil Pb element. The total content of heavy metals in tea garden soil could not fully reflect the bioavailability of tea plant, however, the chemical fractions of heavy metals would be more important in evaluating the tea bioavailability.
出处
《土壤通报》
CAS
北大核心
2017年第1期202-207,共6页
Chinese Journal of Soil Science
基金
福建省科技创新平台建设项目(No.2013N2009)
福建省科技厅重点项目(No.2014N0030)资助
作者简介
叶宏萌（1984-），女，博士研究生，讲师；研究方向为水资源保护和环境地球化学。E-mail：hongmengye@sina．com
通讯作者：E—mail：ptlgp@126.com
