从茶树不同部位,以及不同季节、品种、树龄新梢铅含量的变化较系统地研究了茶树本身对铅吸收累积特性的影响。结果表明,茶树体内以吸收根铅含量最高,其次为生产枝、侧枝和老叶,茶籽和幼嫩新梢的铅含量较低。新梢和叶片铅含量随其成熟度的提高而增加。茶树成熟叶片和新梢铅含量存在着明显的季节性变化,成熟叶片表现为4~6月最高,7月最低,而新梢表现为春梢明显高于秋梢,秋梢高于夏梢;成熟叶片与新梢铅含量呈极显著正相关。随着树龄的增高,新梢铅含量有升高的趋势。不同茶树品种新梢铅含量存在着一定的差异。
The characteristics of Pb absorption and accumulation in tea plants were studied by the analysis of Pb concentration in different parts of tea plant, in shoots of various seasons, cultivars and ages of tea plant. The results showed that feeding roots had the highest Pb concentration, followed by bud producing stems, lateral branches and old leaves, tender shoots and tea seeds were the lowest. Pb concentration in shoots and leaves increased with their maturity. Tea mature leaves and shoots had obvious seasonal change in Pb concentration with the highest during April to June and with the lowest in July for mature leaves, and spring > autumn > summer for shoots. A significant correlation was found between shoots and mature leaves in Pb concentration. A tendency was also found that the higher Pb concentration in shoots from the older tea plants. The Pb concentration in shoots from various tea cultivars was different to some degree.
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