外源植酸酶对土壤磷酸酶、微生物及平邑甜茶幼苗生长的影响

以盆栽平邑甜茶幼苗为试验材料，通过向盆土浇灌液体植酸酶，探讨了外源植酸酶对根区土壤植酸酶活性、磷酸酶活性、速效磷含量、土壤微生物种类和数量及平邑甜茶幼苗生长特性的影响。结果显示，施入外源植酸酶制剂后，根区土壤植酸酶活性、磷酸酶活性、速效磷含量均显著提高，且提高幅度随着外源植酸酶用量的增加而增大；随着处理时间的延长，土壤植酸酶活性迅速下降后趋于平稳，磷酸酶活性总体呈逐渐上升趋势，速效磷含量快速上升后缓慢下降。外源植酸酶也显著提高了土壤微生物的数量，在植酸酶浓度为40000U／kg时，土壤细菌、放线菌、真菌分别比对照增加30．98％-69．00％、35．78％-249．18％和11．14％-271．28％。施人外源植酸酶第50天，平邑甜茶幼苗根系活力、株高、茎粗、叶面积、光合速率及叶绿素含量均显著提高。

Response of Soil Phosphatase,Microorganism and Malus hupehensis Seedling Growth to Exogenous Phytase

Using potted Malus hupehensis seedlings as materials, the effects of exogenous phytase on activity of soil phytase and phosphatase, content of available phosphorus, species and amount of soil microorganism in root zone and the growth of seedlings were studied by irrigating liquid phytase into the pot soil. The results showed that the activity of soil phytase and phosphatase, and the content of available phosphorus were all increased significantly after applying exogenous phytase to soil, and all of which increased with the increase of the application amount of exogenous phytase. With the prolongation of treat time, the activity of soil phytase became stable after dropping rapidly; the activity of soil phosphatase rose gradually in the mass, and the content of available phosphorus declined slowly after rising fast. Exogenous phytase also significantly increased the quantity of soil microorganisms. After 40 000 U/kg phytase applied to the soil, the quantity of soil bacteria, actinomycetes and fungi increased by 30.98% - 69.00%, 35.78% -249.18%, and 11.14% - 271.28% respectively compared to the control. And the root activity, plant height, stem diameter, leaf area, photosynthetic rate and chlorophyll content of Malus hupehensis seedlings were all significantly improved by exogenous phytase on the 50th day after the application of exogenous phytase.