| 朱文玲,李秀双,田霄鸿,陈娟,王松.小麦与秋豆秸秆配施对土壤有机碳固持的影响[J].农业环境科学学报,2018,37(9):1952-1960. |
| 小麦与秋豆秸秆配施对土壤有机碳固持的影响 |
| Effects of the combined amendment of wheat and huai bean straws on soil organic carbon sequestration |
| 投稿时间：2018-01-14 |
| DOI：10.11654/jaes.2018-0070 |
| 中文关键词: 秋豆秸秆 小麦秸秆 双指数模型 δ13C技术 土壤碳分配 有机碳固持 |
| 英文关键词: huai bean straw wheat straw double exponential model δ13C technology soil carbon distribution soil organic carbon sequestration |
| 基金项目:国家重点研发计划项目（2016YFD0200308）；国家科技支撑计划项目（2012BAD14B11） |
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| 中文摘要: |
| 为揭示麦秸与豆科秸秆配合还田对黑垆土有机碳固持的影响，尝试引入了自然δ13C技术并结合双指数模型方法，选取常年种植玉米的C4土壤，设不添加秸秆（CK）、添加小麦秸秆（W）、添加秋豆秸秆（L）、小麦秋豆秸秆组合添加（W+L）4个处理，进行了80d的恒温控湿室内培养试验。结果表明：培养结束后，秸秆添加处理（W+L、L、W）显著提高了CO2累积释放量和有机碳含量，分别比CK高5.63、2.90、2.60倍和22.3%、10.7%和12.5%；W+L处理显著提高了土壤微生物量碳及微生物熵，分别比CK高39.5%和15.6%；同时W+L、L、W处理也提高了土壤惰性碳库及其占总有机碳的比例，分别比CK高2.82、0.756、1.98倍和2.27、0.569、1.64倍。较W处理，W+L处理的CO2累积释放量、惰性碳库及其在土壤碳库所占比例和微生物量碳及微生物熵均明显增加，增加幅度分别为84.4%、28.1%、23.9%、25.3%和14.5%；同时，W+L处理明显提高了碳库中来自秸秆的新碳含量（Cstraw）及其所占比例（f），分别比W高86.5%和79.8%，且两种秸秆组合的土壤累积矿化量、有机碳含量和微生物量碳氮都表现出"加和效应"。综上，相比于禾本科作物秸秆单独还田，配施豆科绿肥秸秆会大幅提高土壤有机碳矿化量，同时仍能形成更多来自秸秆的新碳和增加土壤碳库稳定性，有利于土壤有机碳固持，且两种秸秆组合的"加和效应"在土壤固碳过程中发挥重要作用。 |
| 英文摘要: |
| In order to investigate the effects of incorporation both wheat and leguminous straws on soil organic carbon (SOC) sequestration in dark loessial soils, incubation experiments were conducted in which the δ13C technique combined with the double exponential model was applied, and the C4 soil which had been used for years of maize cultivation was selected. There were four treatments:addition of no straw (CK), addition of wheat straw (W), addition of huai bean straw (L), addition of both wheat straw and huai bean straw (W+L), and each treatment had 6 replications. The results indicated that the cumulative CO2 emissions of the soil and the SOC were significantly increased by W+L, L, and W treatments by 5.63, 2.90, 2.60 folds and 22.3%, 10.7%, 12.5%, respectively, relative to the CK. The W+L treatment markedly increased the microbial biomass carbon (MBC) content and microbial entropy (qMB) by 39.5% and 15.6%, respectively, compared to CK. According to the results of the double exponential model, the addition of crop straws increased the recalcitrant organic carbon pool (C2) and its proportion to the total organic carbon (C2/SOC) under W+L, L, and W treatments by 2.82, 0.756, 1.98 folds and 2.27, 0.569, 1.64 folds, respectively, compared to CK. In addition, compared with W, the W + L treatment could significantly increase the cumulative CO2 emissions of the soil, C2, C2/SOC, MBC content, and qMB, the increments being 84.4%, 28.1%, 23.9%, 25.3% and 14.5%, respectively. At the same time, W+L markedly increased the exogenous newly-formed carbon from crop straws (Cstraw) and its proportion to the total organic carbon (f), and the increases were 86.5% and 79.8%, respectively. Additive effects were observed in the soil accumulation mineralization, SOC, and MBN. In conclusion, although the mixed addition of cereal and leguminous straws facilitate the rate and amount of SOC mineralization, larger amounts of Cstraw are produced by this method compared to mineralization, and the stability of the SOC pool is also increased, which therefore promotes SOC sequestration. The "additive effects" of the two straws play an important role in SOC sequestration. |
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