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选取雅安市名山区茶园集中分布区的紫色土、黄壤和水稻土为研究对象,向土壤中加入不同浓度的茶多酚,培养3个月后,测定土壤pH值、总酚、水溶性酚、活性铁、络合铁、活性铝、络合铝的含量,分析其变化情况,探讨茶多酚浓度对土壤pH、酚酸及铁铝形态转化的影响,为茶园土壤管理提供科学依据。结果表明:添加茶多酚后,3种土壤均发生酸化现象,其中的紫色土和水稻土添加低浓度茶多酚便可显著酸化,而黄壤只有在添加高浓度茶多酚的条件下才显著酸化。添加高浓度的茶多酚可显著提高3种土壤总酚和水溶性酚含量;添加低浓度茶多酚时,紫色土总酚含量也显著升高,黄壤总酚含量却显著下降,水稻土总酚含量变化不显著。添加茶多酚对黄壤和水稻土活性铁含量无显著影响,但添加高浓度茶多酚可显著降低紫色土活性铁含量;添加茶多酚可显著提高黄壤络合铁含量,但对紫色土和水稻土络合铁含量无显著影响。添加茶多酚可显著降低水稻土的活性铝含量,但对紫色土和黄壤活性铝含量无显著影响,对3种土壤络合铝均无显著影响。土壤酚酸形态和含量可影响土壤酸化及铁铝形态转化。
The purple soil, yellow soil and paddy soil were selected as the research objects in the concentration area of tea garden in the famous mountainous area of Ya’an City. Different concentrations of tea polyphenols were added to the soil. After 3 months cultivation, the soil pH value, total phenolics, water- The contents of active iron, complex iron, active aluminum and aluminum complex were analyzed. The effects of tea polyphenol concentration on soil pH, phenolic acids and the transformation of iron and aluminum were discussed, which provided scientific basis for tea garden soil management. The results showed that acidification occurred in all the three soils after the addition of tea polyphenols. The purple soil and paddy soil could be significantly acidified with low concentration of tea polyphenols, while the yellow soil was significant only when high concentrations of polyphenols were added acidification. Adding high concentrations of tea polyphenols can significantly increase the content of total phenols and water-soluble phenols in three kinds of soils. When adding low concentrations of polyphenols, total phenols in purple soil also increased significantly while total phenols in yellow soil decreased significantly, Phenol content changes insignificantly. Adding tea polyphenols had no significant effect on the activity of iron in yellow soil and paddy soil, but adding high concentration of tea polyphenols could significantly reduce the activity of iron in purple soil. Adding tea polyphenol could significantly increase the content of iron in yellow soil, There was no significant effect of iron content in the paddy soil. Adding tea polyphenols can significantly reduce the active aluminum content in paddy soil, but had no significant effect on the active aluminum content in purple soil and yellow soil, but had no significant effect on aluminum complexation in the three soil types. Soil phenolic acid form and content can affect soil acidification and iron and aluminum morphological transformation.