模拟酸雨和外源铝对茶树铝及一些营养元素吸收积累的影响

采用盆栽方法,研究了模拟酸雨和外源铝对茶树铝及一些营养元素吸收积累的影响,以期为酸沉降区茶园管理提供资料。结果表明,随着外源铝浓度的增加,茶树根、茎和叶中铝含量增加,在适度浓度外源铝处理下,模拟酸雨促进茶树根、茎和叶对铝的吸收与积累,高酸高铝则抑制茶树各器官中铝的积累。外源铝促进茶树根、茎和叶对磷、铜和铁的吸收与积累,促进茶树茎和叶对钾的吸收与积累,对茶树根中钾含量没有明显的影响,外源铝抑制茶树根对钙、镁和锌的吸收与积累,但不影响它们在茶树中的运输,茎和叶中含量增加。模拟酸雨对茶树根和茎中磷含量没有明显影响,pH4.5的模拟酸雨有利于茶叶磷的积累,模拟酸雨对茶树根、茎和叶中钾、钙、镁、铜和锌含量没有明显的影响。无外源铝处理下,模拟酸雨降低茶树根系中铁的含量,对茎和叶中铁含量没有明显影响,外源铝处理下,模拟酸雨明显降低茶树根、茎和叶中铁的含量,并且外源铝处理浓度越高,模拟酸雨对根、茎和叶中铁含量的降低幅度越大。

Effects of Simulated Acid Rain and Exogenous Al on Assimilation and Accumulation of Al and Some Nutrition Elements of Tea Plants

In order to provide valuable information to manage tea garden in acid deposition region,southern China,the assimilation and accu-mulation of Al and some nutritional elements in tea plant were studied using pot experiment treated with different pH acid rain（3.0,4.5,6.0） and exogenous Al（0,0.5,1.0 g.kg-1）.The results showed that the content of aluminum in roots,shoots and leaves of tea plant increased with increasing dosages of Al treatment.Simulated acid rain increased Al accumulation in roots,shoots and leaves of tea plant under suitable Al treatmen（t0.5 g.kg-1 soil）,while the simulated acid rain at high acidity（pH3.0）and the aluminum at high dosages（1.0 g.kg-1 soil）inhibited Al accumulation in tea plant.Exogenous Al promoted P,Cu and Fe accumulation in roots,shoots and leaves of tea plant and K accumulation in shoots and leaves,while had no obvious effects on K in roots of tea plant.Exogenous Al inhibited Ca,Mg and Zn accumulation in roots of tea plant,and had no obvious effects on their translocation in tea plant,thus these elements increased in the shoots and leaves of tea plant.Simulated acid rain had no apparent effects on P in roots and shoots,while simulated acid rain at pH4.5 increased P accumulation in tea leaves.Simulated acid rain had no apparent effects on K,Ca,Mg,Cu and Zn content in tea plant.Simulated acid rain decreased Fe accumula-tion in roots of tea plant,but had no obvious effects on shoots and leaves of tea plant without exogenous Al treatment.Under exogenous Al treatment,simulated acid rain obviously decreased Fe content in roots,shoots and leaves and the higher treatment dosages of exogenous Al,the lower content of Fe in roots,shoots and leaves.