Relationships between soil microbial ecological characteristics and physical-chemical properties of vegetable garden soil
对广州白云区64个菜园土壤样本的研究表明，微生物碳与土壤全氮、碱解氮、有效钾、阳离子交换量和有机质,微生物氮与土壤全氮、全磷、阳离子交换量及有机质,土壤基础呼吸与土壤全氮、碱解氮、全钾、阳离子交换量及有机质,AWCD值与全氮及有机质含量,以及Shannon多样性指数与全氮和阳离子交换量均呈显著正相关关系.较低的碱解氮含量使土壤微生物碳、土壤基础呼吸和呼吸商的值升高，过高的碱解氮则使呼吸商下降；过高的土壤有效磷降低微生物碳、微生物氮和微生物呼吸商.有效磷/碱解氮比值过高降低了土壤微生物碳、微生物氮、微生物碳氮比及土壤基础呼吸.土壤微生物生态特征与土壤理化性质关系密切,有效养分过高及养分比例不适当对土壤微生物均存在不利影响.
The study on the 64 vegetable garden soil samples in the Baiyuan District of Guangzhou City showed that there were significantly positive correlations of soil microbial biomass carbon (Cmic) with soil total N,alkali-hydrolygable N,available K,cation exchange capacity (CEC) and organic matter (OM),of soil microbial biomass nitrogen (Nmic) with soil total N,total P,CEC and OM,of soil basal respiration (SBR) with soil total N,alkali-hydrolygable N,available K,CEC and OM,of AWCD with soil total N and OM,and of Shannon diversity index with soil total N and CEC.Low alkali-hydrolygable N increased Cmic,SBR,and metabolic quotient (qCO2),while high alkali-hydrolygable N decreased qCO2.High available P decreased Cmic,Nmic and microbial quotient,and a high ratio of available P to alkali-hydrolygable N was related to the decrease of Cmic,Nmic,Cmic/Nmic and SBR.It was suggested that there were significant correlations between soil microbial ecological characteristics and physico-chemical properties,and excessive available nutrients or inappropriate ratios of alkali-hydrolygable N to available P in soil were harmful to soil microbes.
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