不同树龄茶树根际土壤酶活性的变化分析

以不同种植年限黄金桂茶树根际土壤为研究对象,分析茶树树龄对土壤酶活性的影响。结果表明,茶树根际土壤中与养分循环相关的酸性磷酸酶、脲酶、蔗糖酶活性随着茶树树龄的增加而上升,且与茶树树龄呈显著正相关,中性磷酸酶、碱性磷酸酶则相反;茶树根际土壤中与抗性相关的多酚氧化酶活性随着茶树树龄的增加而上升且与茶树树龄呈显著正相关,而过氧化物酶、过氧化氢酶、脱氢酶活性则呈下降趋势,与茶树树龄呈显著负相关。土壤酶对茶树树龄的敏感性分析结果表明,不同土壤酶响应茶树树龄变化的趋势为过氧化氢酶脲酶脱氢酶蔗糖酶过氧化物酶多酚氧化酶酸性磷酸酶中性磷酸酶碱性磷酸酶。可见,在茶树生产管理过程中应适当提高磷肥的施用量,老茶树应当加强土壤松耕,以提高土壤中抗性酶活性。

Analysis on changes of soil enzyme activity in rhizosphere soil of tea tree with different planting years

Tea rhizosphere soils of Huangjingui with different planting years were used to research effects of the age of tea tree on soil enzyme activity. The results showed that enzyme activities of acid phosphatase, urease, sucrase, which were related to nutrient cycle, raised as tea tree age increased and was positive related with tea tree age, but activities of neutral phosphatase and alkaline phosphatase were reversed. Polyphenol oxidase, which associated with resistance, showed an upward trend with the increase of tea tree age and significantly positive related with age, while activities of peroxidase, catalase, dehydrogenase reversed. Effects of tea tree with different ages to soil enzyme showed as catalase>urease>dehydrogenase>sucrase>peroxi-dase>polyphenol oxidase>acid phosphatase>neutral phosphatase>alkaline phosphatase. In conclusion, the usage of phos-phorus should be improved in the process of tea production and management, and the cultivation and loosening should be strengthened to the old tea tree in order to improve the resistance-associated enzyme activity in soil.