调节茶园土壤pH对土壤养分、酶活性及微生物数量的影响

目的]考察酸化和碱化作用对茶园土壤主要养分、土壤酶活性及微生物数量的影响,进而探讨pH值变化与三者之间关系。方法]用石灰调节茶园土壤pH进行不同天数培养后研究土壤养分、酶活性及微生物。结果]酸性土壤经石灰调节提高pH 1～2,引起土壤中速效磷、可交换性酸降低,土壤细菌、放线菌数量增加近10倍,真菌随pH增加而减少;土壤过氧化氢酶、多酚氧化酶、脲酶活性随pH调节而增高。结论]随着培养天数的增加茶园土壤pH呈降低趋势;土壤中速效磷、交换性酸、真菌数量及转化酶活性与pH之间呈负相关;土壤中细菌、放线菌数量及过氧化氢酶、多酚氧化酶、脲酶的酶活性与pH呈正相关。

Effects of Adjusting pH of Tea Plantation Soil on Its Soil Nutrients, Enzyme Activity and Microorganisms

Objective] The research aimed to investigate the effects of acidification and alkalization on soil nutrients,soil enzyme activity and microbial quantity in tea plantation soil so as to further explore the mutual relationship between them and the change of pH.Method] The study was conducted by regulating the soil pH of the tea plantation soil with lime on the soil nutrients,enzyme activity and microorganism.Result] Acid soil,with its pH improved by 1~2 units would cause the soil available phosphorus and soil exchangeable acid to reduce.And the quantity of bacteria and actinomyces in the soil would increase by about 10 times.With pH increasing,the fungi decreased.The activity of catalase,polyphenol oxidase,the urease in the soil increased with pH regulation.Conclusion] As the days went on,soil pH decreased.The available phosphorus,exchangeable acid,the number of fungi and invertase activity in the soil were negatively correlated with pH.The quantity of bacteria and actinomyces in the soil and the activity of catalase,polyphenol oxidase,urease were positively correlated with pH.