不同种植方式对青浦行道树土壤理化性质和微生物的影响
The Impact on Soil Physical and Chemical Properties and Microorganisms with Different Methods of Planting Avenue Tree in Qingpu District of Shanghai City

不同的种植方式影响着土壤的理化性质和土壤微生物含量，从而影响行道树的生长。调查青浦主要行道树种植模式和土壤现状，并对土壤密度、pH值、可溶性盐、有机质、水解性氮和土壤的微生物含量进行测定。结果表明：目前青浦行道树土壤存在密度偏大，通气不良现象；土壤pH值较高，呈碱性；可溶性盐分偏低，有机质含量和水解性N的供应水平较低，微生物的数量偏低。带状种植的土壤理化性质优于穴状种植，尤其在土壤微生物方面，带状种植的细菌、真菌和放线菌数量远高于穴状种植的。文中指出在实际养护过程中，可采取适当施用有机肥的措施，降低土壤pH值和密度，提高土壤中有机质和水解性氮含量，对穴状种植的行道树，有条件尽量连成带，形成带状种植。
The different ways of planting affect the physical and chemical properties of soil and soil microorganism content, which affect the growth of trees. Survey Qingpu district main trees planting patterns and current situation of soil, and meantime the soil density, pH, soluble salt hydrolysis, organic matter, nitrogen and soil microbial content were determined. The results show that Qingpu district soil density of main roadside is dense and poor ventilation; the pH value of the soil is higher and alkaline; organic matter content of the soluble salt content is low, and hydrolysis of N supply level is low also; the number of microorganisms is less; the soil physical and chemical properties by belt planting are superior to hole planting, especially in the aspect of soil microorganisms, belt planting is far higher than the number of bacteria, fungi and actinomycetes than hole planting. This paper points out that in the process of practical maintenance, can take appropriate measures to organic, reduce the soil pH value and density, and improve the hydrolysis of organic matter and nitrogen content in soil. The paper makes a suggestion that the avenue tree should be belt planted as far as possible.