京郊日光温室土壤微生物状况和酶活性

 对京郊8个蔬菜主产区县，25个有代表性的日光温室的土壤进行分层取样，用相应的培养基培养，测定分析其土壤微生物数量和土壤酶活性。结果表明，0～20 cm表土层受人为因素的影响土壤微生物数量与土壤酶活性明显高于20～40 cm亚表层土；表层的土壤微生物的数量和大部分土壤酶活性表现为1月份大于5月份；随着种植年限增加，多数土壤微生物的数量和土壤酶活性呈增加趋势，但3～4年增势变缓。土壤细菌、放线菌、真菌之间呈显著正相关关系，碱性、中性、酸性磷酸酶和脲酶之间也呈显著正相关关系，土壤真菌数量和上述酶（除过氧化氢酶）活性呈显著正相关。讨论和分析了影响土壤微生物和相关酶活性的相关因素。

The Soil Microbe Populations and Enzyme Activities in Helio-Greenhouse of Beijing Suburbs

The study was undertaken to investigate the soil microbe populations and enzyme activities in the helio-greenhouse of Beijing suburbs. The soil microbe populations and enzyme activities in soil of 0-20 cm depth were higher than that of 20-40 cm depth and that in January were higher than that in May in the helio-greenhouse, especially in 0-20 cm soil surface layer. The most soil microbe populations and enzyme activities in the helio-greenhouse increased with the increase of cultivation year. There were significant correlations among the number of bacteria, actinomycetes and fungi, so were also true among the enzyme activities of soil acidic, neutral, alkaline phosphatase and urease. Positive relationships between soil enzymes (except catalase) and fungi were also observed. The soil microbe status and enzymes activities and their influencing factors were discussed.