Abstract. In our previous studies, we filtered out fungus (Trichoderma reesei) to have the best ability to transform corn straw into a humic acid-like substance through laboratory incubation experiments. In order to further verify our former findings, we set up a 360 day-field experiment that included three treatments applied under equal C mass: (i) corn straw returned to the field (CS), (ii) fermented corn straw treated with Trichoderma reesei returned to the field (FCS-T), and (iii) blank control treatment (CK). Soil organic carbon (SOC), soil labile organic C components, soil humus composition, and the management levels of SOC pools under the three treatments were analyzed and compared. The results showed that the SOC content of CS and FCS-T treatments increased by 12.71 % and 18.81 %, respectively, compared with CK at 360 d. The humic acid carbon (HA-C) content of the FCS-T treatment was 0.77 g/kg higher than in the CS treatment. Application of FCS-T appeared to promote the significant increase of SOC, carbon pool activity index (CPAI) and carbon pool management index (CPMI) through accumulation of HA-C, humin carbon (HM-C), and easily oxidizable organic carbon (EOC) contents. Application of fermented corn straw treated with Trichoderma reesei (FCS-T) is more valuable and conducive to increasing soil EOC and humus C content than direct application of corn straw.

中文翻译：

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玉米秸秆和发酵玉米秸秆还田对土壤有机碳库和腐殖质组成的影响

摘要。在我们之前的研究中，我们过滤掉了真菌（里氏木霉），通过实验室孵化实验将玉米秸秆转化为类腐殖酸物质的能力最强。为了进一步验证我们之前的发现，我们建立了一个 360 天的田间试验，其中包括在等 C 质量下施用的三种处理：(i) 玉米秸秆还田 (CS)，(ii) 用木霉处理的发酵玉米秸秆瑞星返回现场 (FCS-T)，和 (iii) 空白对照处理 (CK)。对3种处理下土壤有机碳（SOC）、土壤不稳定有机碳组分、土壤腐殖质组成以及SOC库管理水平进行了分析比较。结果表明，在360 d时，CS和FCS-T处理的SOC含量比CK分别增加12.71%和18.81%。FCS-T 处理的腐植酸碳 (HA-C) 含量比 CS 处理高 0.77 g/kg。FCS-T的应用似乎通过HA-C、腐殖质碳（HM-C）和易氧化有机碳的积累促进了SOC、碳库活性指数（CPAI）和碳库管理指数（CPMI）的显着增加。 EOC) 内容。里氏木霉处理发酵玉米秸秆的应用 (FCS-T) 比直接施用玉米秸秆更有价值，更有利于增加土壤 EOC 和腐殖质 C 含量。