不同土壤水分条件下华美新小杆线虫对枯草芽孢杆菌数量、活性及土壤氮素矿化的影响  

Effects of Caenorhabditis elegans on Bacillus subtilis number and activity and soil nitrogen mineralization under different soil moisture conditions

作　　者：毛小芳[1] 胡锋[1] 陈小云[1] 李辉信[1] 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095

出　　处：《应用生态学报》2007年第2期405-410,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目(30170183)

摘　　要：采用悉生培养微缩体系,探讨了不同土壤含水量条件下,华美新小杆线虫(Cae-norhabditiselegans)对枯草芽孢杆菌(Bacillussubtilis)数量和活性及土壤氮素矿化的影响.结果表明:在试验设置的不同含水量条件下,线虫对细菌的取食活动均促进了细菌的增殖,并明显提高了土壤呼吸强度;不同含水量条件对细菌的增殖促进作用总体表现为23%含水量处理>17%含水量处理>28%含水量处理.线虫与细菌的相互作用显著提高了土壤铵态氮和矿质氮含量,促进了土壤氮的矿化.接种线虫对土壤氮素矿化的促进作用表现为23%含水量处理的矿质氮含量显著高于其它两个含水量处理.The study with gnotobiotic microcosm showed within the range of test soil moisture contents, the feeding activity of Caenorhabditis elegans on Bacillus subtilis promoted the latter＇ s proliferation, and enhanced soil respiration significantly. The increment of B. subtilis number varied with soil moisture content, and decreased in the order of 23% 〉 17% 〉 28%. The interaction of C. elegans and B. subtilts increased the contents of soil mineral N and NH4^ ＋ -N significantly, indicating that soil nitrogen mineralization was markedly promoted. A higher nitrogen mineralization rate was observed under 23% soil moisture content.

关 键 词：土壤含水量 食细菌线虫 相互作用 土壤氮素矿化 

分 类 号：S154[农业科学—土壤学]