| 摘要: |
| 【目的】研究不同培养温度下玉米秸秆分解期间土壤有机碳(SOC)、水溶性物质(WSS)、可提取腐殖物质(HE)、胡敏酸(HA)和富里酸(FA)含量的动态变化。【方法】采用室内培养试验，以不添加玉米秸秆为对照，将添加玉米秸秆的土壤于10，25，40，55 ℃培养360 d，研究温度对玉米秸秆腐解期间（0～360 d）土壤有机碳(SOC)、水溶性物质（WSS）、可提取腐殖物质（HE）、胡敏酸（HA）和富里酸（FA）含量及可提取腐殖物质中HA相对比例(PQ)的影响。【结果】在同一培养温度和时间下，随着培养时间延长，玉米秸秆处理土壤SOC和WSS的含量总体降低，HE和FA含量总体则表现为先增加后下降的趋势；添加玉米秸秆土壤PQ值先呈逐渐下降的趋势，到105 d时降至最低，之后随着时间延长，PQ总体增加。从不同温度条件看，40 ℃下培养105～210 d时，PQ值均较低。【结论】培养温度越高越利于土壤中SOC、HE和HA的分解与转化，40 ℃培养条件下玉米秸秆腐解生成的FA最多。 |
| 关键词: 培养温度 玉米秸秆腐解 土壤腐殖质 胡敏酸比例(PQ) 富里酸 |
| DOI： |
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| 基金项目:吉林省科技厅项目（20130206018NY) |
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| Effects of temperature on dynamics of humus during corn stalk decomposition |
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HOU Shuyan,DOU Sen,LIU Jianxin,et al
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| Abstract: |
| 【Objective】This study investigated dynamic changes of soil organic carbon (SOC),water-soluble substance (WSS),extractable humus (HE),humic acid (HA), and fulvic acid (FA) contents during corn stalk decomposition at different temperatures.【Method】Indoor culturing experiment was conducted with no corn stalk addition as control.The soil with corn stalk were incubated for 360 days at 10,25,40,and 55 ℃,respectively.Then the effects of temperature on contents of soil organic carbon (SOC),water-soluble substance (WSS),alkali extraction of humic substances (HE),humic acid (HA) and fulvic acid (FA) and the relative ratio of HA (PQ) in humic substance extraction during corn stalk decomposition period (0-360 d) were analyzed.【Result】Under same temperature,SOC and WSS contents reduced as the increase of incubation time while HE and FA decreased gradually following initial increase.Soil PQ value with the existance of corn stalk decreased gradually to the minimum at 105 d,and then it increased gradually.The lowest PQ value was obtained when cubatrated at 40 ℃ for 105-210 d.【Conclusion】Higher incubation temperature was more conductive to decomposition and transformation of SOC,HE and HA.The temperature of 40 ℃ generated the largest FA content during corn stalk decomposition. |
| Key words: culture temperature corn stalk decomposition soil humus radio of humic acid in humus (PQ) fulvic acid |
