日光温室连作黄瓜根区微生物区系及酶活性的变化

Variation of microflora and enzyme activity in continuous cropping cucumber soil in solar greenhouse

以日光温室黄瓜连作土壤为研究对象 ,研究不同连作年限根区土壤微生物数量、种类及酶活性的变化 ,并运用通径分析方法阐明其与土壤主要理化性状的关系 .结果表明 ,土壤微生物数量、酶活性表现明显的温室连作效应 :伴随连作年限的增加 ,土壤微生物总量、细菌、放线菌数均呈倒“马鞍”形变化 ,真菌数量则呈线性增长 ,微生物由“细菌型”向“真菌型”过渡 ,其中氨化细菌和尖孢镰刀菌分别为温室黄瓜连作土壤的优势细菌和真菌生理群 ;多数土壤酶活性的变化也呈现倒“马鞍”形 .通径分析表明 ,微量元素 (Cu、Mn、Fe)、有机质、速效N。

Variation of microflora and enzyme activity in solar greenhouse soil continuous cropping for 1,3,5,7,9 years was studied ,in addition to the relationship between soil properities and microflora and enzyme activity.The results showed that number of bacteria,actinomyce as well as total microflora showed a trend with a saddle shaped curve ,while the number of fungi appeared an liner increase.Continuous cropping soil microflora shifed from bacteria type to fungi type significiently,of which Ammoniation bacterium and Fusarium oxysporum were main physiology groups.Path analysis results showed that microelements(Mn,Cu,Fe),organic matter,available N and bulk density are main restricted factors of soil microflora and enzyme activity in solar greenhouse.