凤凰单枞茶树吸收土壤铬和锰的规律研究
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广东省科技计划项目“潮州凤凰茶古茶树不同品种(香型)化学指纹图谱库的建立及信息共享平台建设”(2017A030303086)


Absorption Law of Soil Cr and Mn in Fenghuang Dancong Tea Tree
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    摘要:

    [目的]探究凤凰单枞茶树对土壤中铬和锰的吸收规律,为综合防治茶园土壤Cr和Mn污染提供科学依据。[方法]对粤东揭阳市揭东县宝山茶园凤凰单枞茶树和土壤进行采样,运用原子吸收分光光度计法测定茶叶、茶茎和茶根中Cr和Mn的含量,并采用乙酸提取法和原子吸收分光光度计法测定土壤样品中酸可提取态Cr和Mn的含量。[结果]茶树各器官Cr含量由高到低分布情况依次为:茶根 > 茶茎 > 茶叶;而Mn含量分布情况依次为:茶叶 > 茶茎 > 茶根。茶叶中Cr和Mn含量与土壤中酸可提取态Cr和Mn呈显著正相关性,茶茎中Cr含量与土壤中酸可提取态Cr也呈显著正相关性;茶叶、茶茎和茶根中的Cr含量均与土壤中有机质含量呈显著正相关性,茶根中的Mn含量与土壤pH值呈显著负相关性,茶叶中的Mn与土壤有机质呈显著正相关性。[结论]通过调节土壤酸可溶解态Cr和Mn,土壤pH值和有机质含量,从而控制茶树吸收Cr和Mn的量,可以达到防治茶叶重金属污染,提高茶叶质量的目的。

    Abstract:

    [Objective] Investigating the absorption rule of Cr and Mn in soil by Fenghuang Dancong tea, to provide a scientific basis for the integrated control of Cr and Mn pollution in tea garden soil.[Methods] The samples of tea tree and soil were collected from Baoshan tea garden which located at Jiedong County, Jieyang City, Guangdong Province. The contents of Cr and Mn in tea leaves, tea stems and tea roots were determined by flame atomic absorption spectrophotometer(AAS), and the acid exchangeable fractions of Cr and Mn in soil were extracted according to acetic acid extraction method and measured by AAS.[Results] The Cr contents distributed in tea trees were:tea root > tea stem > tea leaves; while the Mn content were tea leaves > tea stem > tea root. Correlation analyses showed that the content of Cr and Mn in tea leaves was highly positive with acid exchangeable fraction of Cr and Mn in soil, the same correlation was also found for the content of Cr in tea stems. Furthermore, the Cr content of tea leaves, tea stems and tea roots had high positive correlations with soil organic matter in soil, the Mn content of tea leaves had similar correlation with soil organic matter. The content of Mn in tea roots was highly negative correlated with the soil pH values.[Conclusion] It is possible to restrict the uptake of Cr and Mn in tea tree by adjusting the content of acid exchangeable fractions of Cr and Mn, organic matter and pH value in soil. The heavy metal contamination in tea leaves could be inhibited and the quality of tea leaves could be improved.

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李张伟.凤凰单枞茶树吸收土壤铬和锰的规律研究[J].水土保持通报,2018,38(2):71-74

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  • 收稿日期:2017-10-15
  • 最后修改日期:2017-11-03
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  • 在线发布日期: 2018-05-17
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