PDF(Sci-hub)
Abstract：
BACKGROUND: Lead (Pb) is not an essential element for the growth of tea trees, but it is an important index for evaluating the quality and safety of tea. Lead is a sensitive metal to pH. Exploring the changing trend of soil Pb and enrichment coefficient of Pb in tea leaves affected by soil acidification is significant for tea planting and tea quality safety control.
RESULTS: A percent of 37.57% of the 364 tea plantations in Anxi county of China showed soil acidification that is a soil pH value < 4.5. However, the total Pb content in the soil and Pb content of tea leaves met the requirements stipulated in China. The soil available Pb content and Pb content in tea leaves were both significantly negatively correlated with soil pH value, and increased with the decrease of soil pH value. The soil available Pb content had a significant positive correlation with soil total Pb content. However, the soil total Pb content had no significant correlation with soil pH value. Moreover, the soil Pb bio-availability coefficient and the Pb enrichment coefficient of tea leaves decreased with the increase of soil pH value.
CONCLUSIONS: More than a third of tea plantations in Anxi county had been acidified. The decrease of pH value leads to an increase in the bio-availability coefficient of soil Pb content and the enrichment coefficient of Pb content in tea leaves. The lower soil pH value resulted in the increase of the absorption and accumulation of Pb by tea trees, thus an increase of Pb content in tea leaves. © 2021 Society of Chemical Industry.
RESULTS: A percent of 37.57% of the 364 tea plantations in Anxi county of China showed soil acidification that is a soil pH value < 4.5. However, the total Pb content in the soil and Pb content of tea leaves met the requirements stipulated in China. The soil available Pb content and Pb content in tea leaves were both significantly negatively correlated with soil pH value, and increased with the decrease of soil pH value. The soil available Pb content had a significant positive correlation with soil total Pb content. However, the soil total Pb content had no significant correlation with soil pH value. Moreover, the soil Pb bio-availability coefficient and the Pb enrichment coefficient of tea leaves decreased with the increase of soil pH value.
CONCLUSIONS: More than a third of tea plantations in Anxi county had been acidified. The decrease of pH value leads to an increase in the bio-availability coefficient of soil Pb content and the enrichment coefficient of Pb content in tea leaves. The lower soil pH value resulted in the increase of the absorption and accumulation of Pb by tea trees, thus an increase of Pb content in tea leaves. © 2021 Society of Chemical Industry.
摘要：
背景：铅（Pb）不是茶树生长的必需元素，但它是评价茶叶质量和安全性的重要指标。铅是对pH敏感的金属。探讨土壤酸化对土壤Pb的变化趋势和茶叶中Pb的富集系数对茶叶种植和茶叶质量安全控制具有重要意义。
结果：中国安溪县364个茶园中有37.57％的人表现出土壤酸化，即土壤pH值<4.5。然而,土壤中总铅和茶叶中铅的含量均达到了中国规定的要求。土壤有效Pb含量和茶叶中Pb含量均与土壤pH值呈极显著负相关,随着土壤pH值的降低而增加。土壤有效Pb含量与土壤总Pb含量呈显著正相关。然而,土壤总Pb含量与土壤pH值无显著相关性。此外，土壤Pb生物有效性系数和茶叶Pb富集系数随土壤pH值的增加而降低。
结论：安溪县超过三分之一的茶园已经酸化。pH值的降低导致土壤Pb含量的生物有效性系数和茶叶中Pb含量的富集系数增加。较低的土壤pH值导致茶树对Pb的吸收和积累增加，从而增加了茶叶中铅的含量。©2021年化学工业学会。
结果：中国安溪县364个茶园中有37.57％的人表现出土壤酸化，即土壤pH值<4.5。然而,土壤中总铅和茶叶中铅的含量均达到了中国规定的要求。土壤有效Pb含量和茶叶中Pb含量均与土壤pH值呈极显著负相关,随着土壤pH值的降低而增加。土壤有效Pb含量与土壤总Pb含量呈显著正相关。然而,土壤总Pb含量与土壤pH值无显著相关性。此外，土壤Pb生物有效性系数和茶叶Pb富集系数随土壤pH值的增加而降低。
结论：安溪县超过三分之一的茶园已经酸化。pH值的降低导致土壤Pb含量的生物有效性系数和茶叶中Pb含量的富集系数增加。较低的土壤pH值导致茶树对Pb的吸收和积累增加，从而增加了茶叶中铅的含量。©2021年化学工业学会。
