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The effects of simulated inundation duration and frequency on litter decomposition: A one-year experiment

机译：模拟淹没持续时间和频率对凋落物分解的影响：一年的实验

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摘要

There is major uncertainty in the responses of litter decomposition to the inundation regimes in field studies, mainly because of the difficulties in identification of the individual effect of duration and frequency using field studies alone. The interactive role of inundation regime and litter quality also remains unclear. The responses of mass loss to simulated inundation regime (duration and frequency) and litter quality were investigated in leaves of Carex brevicuspis and leaves and stems of Miscanthus sacchariflorus from Dongting Lake, China. Three litter types differing in litter quality were incubated under seven different inundations over 360 days (three single inundations of 90, 180, and 360 days; three repeated 180-day inundations of 2, 3, and 6 times; and no inundations) in a pond near Dongting Lake. Initial N and P contents were highest in C. brevicuspis leaves, intermediate in M. sacchariflorus leaves, and lowest in M. sacchariflorus stems, whereas the organic C, cellulose, and lignin contents were ranked in the opposite order among the three litter types. Decomposition rate was highest in M. sacchariflorus leaves (0.00222-0.00900 day(-1)), intermediate in C. brevicuspis leaves (0.00135-0.00500 day(-1)), and lowest in M. sacchariflorus stems (0.00080-0.00100 day(-1)). The decomposition rate of both C. brevicuspis and M. sacchariflorus leaves increased with increasing inundation duration or decreasing frequency. However, both duration and frequency of inundation had no effect on decomposition of M. sacchariflorus stems. At the end of the incubation, N mineralization was complete in leaf litters with increasing rates with increasing inundation duration or decreasing inundation frequency, but accumulation was found in M. sacchariflorus stems. Organic C decayed quickly in both leaf litters compared with the stem litter. These data indicate that inundation regime has no effect on the decomposition of refractory stem litter while prolonged and stable inundati
机译：垃圾分解对实地研究中的淹没制度的反应存在重大不确定性，主要是因为识别持续时间和频率的个性效果的困难，使用现场研究。淹没制度和垃圾质量的互动作用也尚不清楚。 Carex Brevicuspis叶片的叶片与中国洞庭湖的Miscanthus Sacchariflorus的叶子和茎和垃圾叶片中的质量损失对模拟淹没制度（持续时间和频率）和垃圾质量的响应。垃圾质量不同的三种垃圾类型在360天内孵育了七种不同的洪水（三个单一淹没为90,180和360天;三次重复180天淹没2,3和6次;没有淹没）洞庭湖附近的池塘。初始N和P含量在C.Brevicuspis叶中最高，中间体在M. Sacchariflorus叶中，并且在M.Sacchariflorus茎中最低，而有机C，纤维素和木质素含量以相反的顺序排列在三种垃圾类型中。分解速率在M.Sacchariflorus叶中最高（0.00222-0.00900天（-1）），C.Brevicuspis叶中的中间体（0.00135-0.00500天（-1）），M.Sacchariflorus茎中最低（0.00080-0.00100天（ -1））。 C.Brevicuspis和M.Sacchariflorus的分解率随着淹没持续时间或频率的升高而增加。然而，淹没的持续时间和频率都没有对M. Sacchariflorus茎的分解没有影响。在孵育结束时，N矿化在叶片窝中完全，随着淹没持续时间或淹没频率的增加而增加，但在M.Sacchariflorus茎中发现了积累。与茎垫片相比，有机C在两个叶子窝中蒸馏出速度。这些数据表明，淹没制度对耐火茎垫片的分解没有影响，而延长稳定的伊朗德提

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  • 来源
    《Limnologica》 |2019年第2019期|共6页
  • 作者

    Xie Yajun; Xie Yonghong; Xiao Huayun; Chen Xinsheng; Li Feng;

  • 作者单位

    East China Univ Technol Sch Water Resources &

    Environm Engn Jiangxi Prov Key Lab Causes &

    Control Atmospher P Key Lab Nucl Resources &

    Environm Minist Educ Nanchang 330013 Jiangxi Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Key Lab Agroecol Proc Subtrop Reg Dongting Lake Stn Wetland Ecosyst Res Changsha 410125 Hunan Peoples R China;

    East China Univ Technol Sch Water Resources &

    Environm Engn Jiangxi Prov Key Lab Causes &

    Control Atmospher P Key Lab Nucl Resources &

    Environm Minist Educ Nanchang 330013 Jiangxi Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Key Lab Agroecol Proc Subtrop Reg Dongting Lake Stn Wetland Ecosyst Res Changsha 410125 Hunan Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Key Lab Agroecol Proc Subtrop Reg Dongting Lake Stn Wetland Ecosyst Res Changsha 410125 Hunan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 陆地水文学、水文地理学（水象学）;
  • 关键词

    Inundation duration; Inundation frequency; Litter decomposition; Dongting Lake; Carex brevicuspis; Miscanthus sacchariflorus;

    机译：淹没持续时间;淹没频率;垃圾分解;洞庭湖;Carex Brevicuspis;Miscanthus sacchariflorus;

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