前言土壤是一个无机、有机、生物复合体,由于植物和微生物的生长发育,使之表现出相应的生物活性。高等植物通过根系吸收水分和养料,同时为土壤微生物的生长发育造就了特殊的生态条件。植物根在土壤中的穿插。挤压作用,根系的脱落物和分泌物为微生物创造赖以生存的理化条件、而微生物的生命活动则使有机物质无机化。为植物提供可给态的养料,并 Introduction Soil is an inorganic, organic, and biological complex that exhibits corresponding biological activity due to the growth and development of plants and microorganisms. Higher plants absorb moisture and nutrients through the roots, creating special ecological conditions for the growth and development of soil microbes. Plant roots interspersed in the soil. Extrusion, root shedding and secretions for the creation of microorganisms to survive the physical and chemical conditions, while the life activities of microorganisms make organic matter inorganic. Provide plants with nutrients that can be given