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首页> 外文期刊>Journal of Environmental Management >Decomposition of maize stover varies with maize type and stover management strategies: A microcosm study on a Black soil (Mollisol) in northeast China
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Decomposition of maize stover varies with maize type and stover management strategies: A microcosm study on a Black soil (Mollisol) in northeast China

机译：玉米秸秆的分解随玉米类型和秸秆管理策略的变化而变化：中国东北黑土（Mollisol）的缩影研究

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摘要

Crop residue decomposition has an important impact on soil organic carbon (SOC) sequestration and CO2 emission. Residue quality and management strategies are two important factors regulating decomposition process and SOC mineralization and greenhouse gas emission. In this study, a microcosm experiment in field condition was conducted on a silty loam (a Black soil) in Northeast China to investigate stover decomposition and soil CO2 emission characteristics as influenced by different crop cultivars and stover field incorporation methods. Stover from two popular maize cultivars Xianyu335 (XY) and Liangyu99 (LY) were applied in two modes (soil surface application vs soil incorporation) at a rate of 11 t ha(-1), and CO2 efflux was monitored during the decomposition duration of 144 days. The structural transformation of carbon functional groups in maize stover were evaluated using solid state C-13-CPMAS NMR and elemental analysis techniques. Results showed that up to 71.7%similar to 86.9% (weight basis) of C and N in soil-incorporated stover was decomposed during the study period, which was significantly greater than the losses (32.8%similar to 55.3%) of C or N from the surface-applied stover for both maize cultivars; decomposition rates of main C functional groups were significantly higher in soil incorporation (71.1%similar to 88.8%) than in surface application (20.9%similar to 60.2%) systems. The concentrations of SOC, total N, available N, and microbial biomass C and N in soil were also higher with stover incorporation than surface application. Stover incorporation resulted in a notably lower CO2 emission rate and accumulative CO2 efflux (53.9-55.4 mol m(-2)) during the stover decomposition compared with surface application (57.4-67.0 mol m(-2)). Between the two maize cultivars, the LY stover showed a higher decomposition rate and greater capacity for SOC sequestration when incorporated into soil. The LY stover induced higher (16.8%) CO2 emission than XY when applied on soil surface, but no significant difference was found between the two cultivars when incorporated into soil. The results suggested that cultivar selection and stover management strategies have great potential in reducing soil CO2 emission while improving soil biochemical properties. Incorporating the LY stover into soil rather than surface mulching could enhance SOC sequestration and reduce CO2 emission.
机译：作物残渣的分解对土壤有机碳的固存和CO2排放具有重要影响。残留物质量和管理策略是调节分解过程以及SOC矿化和温室气体排放的两个重要因素。在这项研究中，在中国东北的粉质壤土（黑土）上进行了田间条件的缩影实验，研究了不同作物品种和秸秆还田方式对秸秆分解和土壤CO2排放特征的影响。以两种模式（土壤表面施用与土壤掺入）以11 t ha（-1）的速率施用两种流行玉米品种Xianyu335（XY）和Liangyu99（LY）的秸秆，并在CO2分解期间监测CO2外流144天。使用固态C-13-CPMAS NMR和元素分析技术评估了玉米秸秆中碳官能团的结构转化。结果表明，在研究期间，土壤结合的秸秆中分解出的碳和氮高达71.7％，与86.9％（以重量计）相似，远大于碳或氮的损失（32.8％，与55.3％类似）。从两个玉米品种的表面施肥秸秆中提取；在土壤掺入过程中，主要碳官能团的分解率（71.1％，接近88.8％）显着高于表面施用（20.9％，接近60.2％）。秸秆还田方式下土壤中SOC，总氮，有效氮，微生物量碳和氮的含量也高于表面施用。与表面施用（57.4-67.0 mol m（-2））相比，秸秆掺入在秸秆分解期间显着降低了CO2排放速率和累积CO2流出（53.9-55.4 mol m（-2））。在两个玉米品种之间，LY秸秆掺入土壤后表现出更高的分解速率和更大的SOC螯合能力。当施用在土壤表面时，LY秸秆诱导的CO2排放量比XY排放高（16.8％），但是当两个品种结合到土壤中时，没有发现显着差异。结果表明，品种选择和秸秆管理策略在减少土壤CO2排放，改善土壤生化特性方面具有巨大潜力。将LY秸秆掺入土壤而不是覆盖地表可以增强SOC隔离并减少CO2排放。

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  • 来源
    《Journal of Environmental Management》 |2019年第15期|226-236|共11页
  • 作者

    Liu Siyi; Fan Ruqin; Yang Xueming; Zhang Zhenhua; Zhang Xiaoping; Liang Aizhen;

  • 作者单位

    Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China|Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Jilin, Peoples R China|Nanjing Normal Univ, Sch Geog Sci, Nanjing 210047, Jiangsu, Peoples R China;

    Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China|Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Jilin, Peoples R China;

    Agr & Agri Food Canada, Greenhouse & Proc Crops Res Ctr, Harrow, ON N0R 1G0, Canada;

    Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Jilin, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Jilin, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Black soil; C-13-NMR; Carbon sequestration; CO2 emission; Maize cultivar; Stover management;

    机译：黑土;C-13-NMR;固碳;CO2排放;玉米品种;秸秆处理;

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