长期秸秆还田秋施肥对褐土微生物碳、氮量和酶活性的影响

通过对山西寿阳长期定位试验田0~20和20~40 cm的褐土土壤测定和分析,探讨了长期秸秆还田秋施肥下褐土微生物生物量碳、氮和酶活性的变化以及相关性。结果表明,褐土微生物碳、氮量和脲酶、碱性磷酸酶活性从0~20 cm土层到20~40 cm土层均呈减少趋势。长期秸秆还田秋施肥和长期秸秆还田春施肥都使微生物碳、氮量增加;长期秸秆还田秋施肥提高了褐土土壤脲酶活性;长期秸秆还田秋施肥和长期秸秆还田春施肥都可以明显提高碱性磷酸酶活性。微生物碳、氮量和脲酶、碱性磷酸酶活性之间有显著的相关性,这种相关性表明它们可作为综合指标来反映褐土土壤微生物生态环境的变化。

Effects of Long-term Returning Corn Stalks to the Field Combined with Applying Fertilizer in Autumn on Microbial Biomass C,N and Enzyme Activity in Cinnamon Soil

The soil of long-term experimental field(0-20 and 20-40 cm)was detected and analyzed in Shouyang county,Shanxi province.The changing of the microbial biomass C,N and soil enzyme activity in cinnamon soil and the correlation among them were both approached by long-term returning corn stalks to the field combined with applying fertilizer in autumn.The results were as follows:the amount of BC,BN and the activity of Urease and Alkaline phosphatase in cinnamon soil both decreased from 0-20 cm layer to 20-40 cm layer.BC and BN in cinnamon soil could both increased through long-term returning corn stalks to the field combined with applying fertilizer in autumn and long-term returning corn stalks to the field combined with applying fertilizer in spring.Urease activity in cinnamon soil could increase by long-term returning corn stalks to the field combined with applying fertilizer in autumn.Alkaline phosphatase activity in cinnamon soil was obviously enhanced by returning corn stalks to the field combined with applying fertilizer in autumn or spring in a long term.The apparent positive correlation was found between microbial biomass C,microbial biomass N and activities of urease and alkaline phosphatase.The four kinds of soil quality indicators-microbial biomass C,microbial biomass N,urease and alkaline phosphatase can be considered as a comprehensive index which reflected the change of soil microbial entironment.