摘要
为研究接种丛枝菌根真菌(AMF)对玉米秸秆降解的影响,利用玉米秸秆为材料制成网袋,采用盆栽试验,以玉米(Zea mays L.)为宿主植物,分别接种Glomus intraradices和Glomus mosseae,于30,40,50,60d时收获后分析玉米秸秆降解量和C、N释放量,并运用Olson的指数模型Bt/B0=e-kt计算玉米秸秆及C、N的降解系数。数据表明,接种G.intraradices、G.mosseae显著提高了玉米秸秆降解量和降解系数,与不接种处理相比,分别高出5.21%,6.26%。C释放量、碳素降解系数也明显增加。接种处理减少了N释放量,且氮素降解系数随时间延长而下降。接种处理玉米秸秆的C、N降解系数不同直接反映了其降解速度的差异,进而影响了玉米秸秆的C/N,使秸秆更易于降解。研究结果显示出丛枝菌根真菌在生态系统氮循环中具有重要意义。
To investigate influences of arbuscular mycorrhizal fungi（AMF） inoculation on degradation of Zea mays（maize） straw, a pot experiment was carried out maize as host plants and two different arbuscular myeorrhizal fungus, Glomus intraradices and Glomus mosseae were inoculated. Harvested samples respec- tively in 30, 40, 50, 60 days, maize straw was oven dry and measured the degradation mass, C release and N release, and calculated the degradation coefficient（k） of degradation mass, C and N release by the Olson＇s index model. The results showed that mycorrhiza inoculation caused more maize straw degradated and higher degradation rate compared with non-mycorrhizal treatment, 5.21%, 6.26 % degradation rate of maize straw in soil inoculated with G. intraradices, G. rnosseae. C release and carbon degradation index increased signifi- cantly. But N release and nitrogen degradation index were reversed alone with the sampling time. Carbon and nitrogen degradation coefficients directly reflected their degradation speed, mycorrhiza inoculation affected the C/N of corn straw, made the C/N be facilitated to degrade. Results showed that arbuscular mycorrhizal fungi had important significance in nitrogen cycle of ecological system.
出处
《水土保持学报》
CSCD
北大核心
2012年第4期267-270,278,共5页
Journal of Soil and Water Conservation
基金
中央高校基本科研业务费专项(XDJK2010B012)
关键词
玉米秸秆
降解
丛枝菌根真菌
降解系数
C/N比
maize straw
degradation arbuscular mycorrhizal fungi（AMF） degradation coefficientl C/N ratio
