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川西蒙山茶树中铅、镉元素的吸收累积特性

Keywords: ,,复合污染,吸收累积,生物量

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Abstract:

通过盆栽试验,探讨了川西蒙山茶树中铅、镉元素的吸收累积特性及茶叶生物量的变化。结果表明,铅、镉元素在茶树体内由高到低的分布秩序为:吸收根>嫩茎>成熟叶片>新梢(一芽二叶);茶树各部位(吸收根、嫩茎、成熟叶片)铅、镉含量与土壤铅、镉含量间有极显著正相关关系;复合污染下,镉对吸收根、嫩茎、春茶、夏茶累积铅具有协同作用,铅对吸收根累积镉具有协同作用,对茶树其他部位累积镉具有拮抗作用;铅处理下,春茶生物量无显著变化,夏茶生物量与铅浓度呈极显著负相关(P<0.01);镉处理下,春茶生物量与镉浓度呈显著负相关(P<0.05),夏茶生物量呈极显著负相关(P<0.01)。当镉浓度达到60mg·kg-1时,夏茶植株中毒致死。

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