【目的】探讨大豆重迎茬对根际可培养微生物及土壤理化性状的影响.【方法】以正茬和重迎茬大豆根际土壤为研究对象，在不同生育时期取根际土进行土壤微生物区系、微生物生理类群和土壤理化性状等指标的测定.【结果和结论】大豆重迎茬对土壤可培养微生物及微生物生理类群有较大影响.重迎茬使大豆全生育期细菌、放线菌、氨化细菌、硝化细菌、好气性自生固氮菌和纤维素分解菌总量减少，真菌数量显著增加.各处理土壤平均碱解氮和速效钾含量顺序为：正茬>迎茬>重茬1年>重茬2年>重茬3年；而土壤速效磷含量为正茬>迎茬>重茬1年>重茬3年>重茬2年.轮作正茬大豆土壤团聚体的平均质量直径(MMD)和几何平均直径(GMD)均高于迎茬和重茬各处理，其中以 GMD 差异更显著.
【Objective】Effects of soybean continuous cropping on soil microorganisms and physicochemical properties were studied.【Method】With the rhisphere soils of cropping and rotation soybean as test materials, the following indexes including soil microorganisms, bacterial physiological groups, physicochemical properties were investigated during the different growth stages of soybean.【Result and conclusion】The results showed that there were significant influences of continuous and alternate cropping on soil microorganisms. The number of bacteria, actinomycetes decreased, especially the reduction of ammonifying bacteria, nitrifying bacteria, aerobic nitrogen-fixing bacteria, cellulose-decomposing bacteria, but fungi amount increased. The content order of soil available nitrogen and potassium was rotation cropping>alternate cropping>1-year continuous cropping>2-year continuous cropping >3-year continuous cropping. The content order of soil available phosphorus was rotation cropping>alternate cropping>1-year continuous cropping>3-year continuous cropping >2-year continuous cropping. The mean mass diameter and geometric mean diameter of rotation soil were significantly higher than alternate and continuous cropping.
于 寒,吴春胜,王振民,陈喜凤,谷 岩.连作对大豆根际可培养微生物及土壤理化性状的影响[J].华南农业大学学报,2014,35(2):28-34复制