不同解磷菌剂对美国山核桃根际微生物和酶活性的影响

Effects of Different Phosphate-Solubilizing Bacteria on Rhizosphere Microorganism and Enzyme Activities of Pecan Seedlings

通过盆栽试验研究3种施P水平下绿针假单胞菌、荧光假单胞菌、蜡样芽孢杆菌3种细菌及其混合菌群对美国山核桃苗3个生长时期根际微生物数量和酶活性的影响。结果表明:施加4种细菌菌剂后山核桃根际土壤中的细菌和放线菌数量增加,真菌数量减少,土壤磷酸酶和脲酶活性上升;3种施P水平下,随着施P水平的提高,各种菌剂对根际微生物数量和酶活性的影响逐渐降低,且3种细菌的混合菌剂较单一菌种对根际微生物数量及土壤磷酸酶和脲酶活性的影响更大。

A potting experiment was conducted to evaluate effects of three phosphate-solubilizing bacteria（PSB）（Pseudomonas chlororaphis,P.fluorescens,Bacillus cereus） and their mixture on rhizosphere soil microorganism and enzyme activities at three growth stages of pecan（Carya illinoensis） seedlings subjected to three application levels of calcium-superphosphate.Results showed that：Inoculation of the three PSB and their mixture increased the amounts of rhizosphere bacteria and actinomyces,reduced the amounts of rhizosphere fungi,and enhanced activities of phosphatase and urease.However,the effects on rhizosphere microorganism and enzyme activities decreased progressively with increase of calcium-superphosphate content.The bacteria mixture was stronger effects than that of any single bacterium,and brought about the most rhizosphere bacteria and actinomyces,the lest rhizosphere fungi,and the highest activities of phosphatase and urease in all three application levels of calcium-superphosphate compared to inoculation with any single bacteria.