土壤-苦丁茶树系统中Cu的分布及迁移富集规律

The distribution,migration and enrichment of Cu in soil-Kudingcha tree system

采用火焰原子吸收光谱(FAAS)技术,测定出苦丁茶冬青(Ilex kudingcha C.J.Tseng)的根、茎、叶及其栖息土壤中Cu的含量,并对土壤-苦丁茶树系统中Cu的分布特征进行了研究,以探讨苦丁茶树对Cu的富集规律。结果表明:栖息土壤中Cu的含量不同时,苦丁茶树中Cu的含量表现出吸收根>嫩叶>茎>主根;茶树对Cu的吸收存在饱和特性,表现为随土壤Cu含量升高,茶树对Cu的富集系数和传输效率降低,使得根际土壤中Cu含量高于非根际土壤。同时对土壤剖面不同深度Cu含量研究表明:苦丁茶栖息土壤中Cu含量呈现出随土层深度增加而增加的垂直分布趋势。本研究旨在认清Cu迁移到苦丁茶树的内在规律,以利于进一步研究其迁移的调控,使苦丁茶产品中元素处在安全有效的利用范围内。

In order to explore the enrichment pattern of Cu in Kudingcha tree （Ilex kudingcha C.J.Tseng）, the Cu content in root, stem, leaf and habitat soil samples of Kudingcha trees were detected by Flame Atomic Absorption Spectrometry（FAAS）, and the distribution of Cu in the soil-Kudingcha system were also studied. The results showed that the amount and distribution of Cu was extremely similar among Kudingcha trees grown up in different habitat soil. The distribution pattern is： roots〉tender With the increasing of Cu content in soil, the absorption of tea trees was tend to saturation, the enrichment coefficient and transmission efficiency of Cu in tea trees was tend to decreased. It caused Cu content in rhizosphere soil was higher than non-rhizosphere soil. Simultaneously, the detection of Cu content in soil at different depths showed that the content of Cu in Kudingcha trees habitat soil was increased according to the soil depth. This study aimed to identify the inherent law of Cu transference in Kudingcha tree, and the results will be useful for the control of Cu content in a safe range during Kudingcha growth and related production.