不同浓度和pH对茶多酚活化土壤硅、铝、铁的影响  

Effect of Tea Polyphenols on Mobilization of Soil Si, Al and Fe at Different Concentrations and pH Values

作　　者：何刚[1] 袁大刚[1] 张东坡[1] 张俊思[1] 母媛 王昌全[1] 

机构地区：[1]四川农业大学资源环境学院,四川成都611130

出　　处：《土壤通报》2015年第1期111-116,共6页Chinese Journal of Soil Science

基　　金：国家自然科学基金面上项目(41371230)资助

摘　　要：通过浸提试验研究了不同浓度茶叶提取物、儿茶素和表没食子儿茶素没食子酸脂(EGCG)3种茶多酚(TPs)和不同p H下EGCG对漂洗水稻土和黄壤Si、Al和Fe活化的影响。结果表明:(1)随TPs浓度升高,土壤Si活化量在茶叶提取物和儿茶素作用下总体上均增加,在EGCG作用下却先增后减;Al、Fe活化量在各TP作用下均增加。同一浓度下,各TP活化Si的量均为漂洗水稻土>黄壤,活化Al或Fe的量均为黄壤>漂洗水稻土。(2)随EGCG溶液p H升高,Si活化量为漂洗水稻土降低,黄壤增加;Al、Fe活化量为2种土壤均增加。同一p H下,EGCG活化Si的量p H≤5.5时为漂洗水稻土>黄壤,p H=6.5时为黄壤>漂洗水稻土;活化Al、Fe的量均为黄壤>漂洗水稻土。综上,TPs浓度和p H对不同土壤Si、Al和Fe的活化有不同影响。Extraction experiments were conducted to a ssess the effect of concentration of tea polyphenols(TPs,including tea extracts, catechin and epigallocatechin gallate(EGCG)) and p H of EGCG extracting solution on the mobilization of Si, Al and Fe in Bleached Paddy Soil and Yellow Earth. The results showed that:(1) As the TPs concentration increased, the amount of Si mobilized by tea extracts or catechin increased, but mobilized by EGCG increased to the highest level and then decreased in both soils. And the amounts of Al and Fe mobilized by the 3types of TPs increased in both soils. Under the same condition of concentration, the amount of Si mobilized in Bleached Paddy Soil was larger than that in Yellow Earth, while the amounts of Al or Fe mobilized by the 3 types of TPs in Yellow Earth were higher than those in Bleached Paddy Soil.(2) As the p H value of EGCG solution increased,the amount of Si mobilized in Bleached Paddy Soil decreased, while that in Yellow Earth increased, and the amount of Al or Fe mobilized in both soils increased. At the same p H value, the amount of Si mobilized was higher in Bleached Paddy Soil than in Yellow Earth when p H ≤5.5, and higher in Yellow Earth than in Bleached Paddy Soil when p H=6.5. However, the amount of Al or Fe mobilized was always higher in Yellow Earth than in Bleached Paddy Soil. These results indicated that both TPs concentration and p H were important factors for Si, Al and Fe mobilization in different soils.

关 键 词：茶多酚 矿质元素 活化 浓度 PH 土壤类型 

分 类 号：S153[农业科学—土壤学]