不同O_2浓度对土壤微生物生物量碳的影响  

Effects of Different Oxygen Concentration on Soil Microbial Biomass Carbon

作　　者：关松[1] 窦森[1] 

机构地区：[1]吉林农业大学资源与环境学院,吉林长春130118

出　　处：《安徽农业科学》2009年第5期2075-2077,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金(40471076)

摘　　要：[目的]研究特定的O2培养条件下土壤微生物生物量碳（SMBC）的动态变化规律。[方法]通过室内模拟试验，研究了玉米秸秆分解期间SMBC对不同O2浓度的响应。[结果]土壤添加玉米秸秆后，激发了土壤微生物生长，在培养第1天各处理SMBC达到了整个培养期最高峰后迅速下降，90d后SMBC下降趋势趋于平缓。在不同浓度的O2培养条件下，0～15d短期培养期间，各处理SMBC间差异不显著，O2浓度为0的SMBC一直保持较高数量。长期培养期间（30～270d），SMBC随着O2浓度的升高而增加，各处理间差异显著。[结论]各处理SMBC分别与土壤有机碳、腐殖物质、富里酸和胡敏素间均呈显著正相关。O2浓度为21％的SMBC与土壤可溶性有机碳呈正相关（r=0．649，P〈0．05），表明正常大气条件更有利于土壤微生物的活性。[ Objective ] The propose was to study the dynamic law of soil microbial biomass carbon （SMBC）under special oxygen （O2） culture condition. [Method] Response of SMBC to different O2 concn, was investigated dttring corn stalk decomposition by laboratory incubation experiment. [ Result] The addition of corn stalk in soil excitated the growth of soil microorganism, SMBC in each treatment reached peak of whole incubation period on first day and then dropped rapidly, SMBC went down slowly after 90 d. Under the culture condition with different O2 conch., the difference on SMBC among different treatments was not notable during short times from 0 d to 15 d and SMBC maintained the high quantity continuously when the O2 was 0. SMBC was increased with the elevation of oxygen concn, and the difference on SMBC among different treatments was notable during long culture times from 30 d to 270 d. [Conclusion] Soil organic carbon, humic substances, fulvic acid and humin were positively correlated with SMBC in each treatment, resp. The water-soluble organic carbon was positively correlated with SMBC （ r = 0.649, P 〈 0.05） when O2 was 21%, which indicated that normal atmosphere condition was more advantageous to the activity of soil microorganism.

关 键 词：O2浓度 土壤微生物生物量碳 相关性 

分 类 号：S154.34[农业科学—土壤学]