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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Hydrologic and Edaphic Controls on Soil Carbon Emission in Dongting Lake Floodplain, China
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Hydrologic and Edaphic Controls on Soil Carbon Emission in Dongting Lake Floodplain, China

机译：洞庭湖洪泛区土壤碳排放的水文和仿效控制

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摘要

Wetlands play a critical role in mitigating carbon emission. However, little is known about soil carbon emission and their environmental controls from inland floodplain wetlands. This study aimed to determine the effects of hydrologic and edaphic controllers (water table depth [WTD], soil temperature [Ts], and soil water content [SWC]) on soil C emission in Dongting Lake wetland, China. One-year emissions were measured in Carex meadow and mudflat using static chambers during 2013 to 2014, including nonflooded season (NFs) and flooded season (Fs). The results showed that soil C emission in the Carex meadow and mudflat was 307.8 and 264.3 g C·m~(-2)·year~(-1), respectively, and 50-66% of soil C were emitted during NFs. Compared with NFs, CO_2 emission was significantly decreased by 57% but CH_4 emission was significantly increased by 38 times during Fs in the Carex meadow. Stepwise regression combined with structural equation model analysis showed that CO_2 and CH_4 flux were mainly influenced by Ts during NFs, and they were controlled by water temperature (Tw) during Fs. During NFs, CO_2 flux increased with increasing Ts and SWC but decreased significantly when SWC was over 66% and 52% in the Carex meadow and mudflat, respectively. CH_4 flux showed an emission pulse at SWC and Ts of 65% and 17.2 °C, respectively. These results indicate that flooding significantly inhibited soil CO_2 emission but stimulated CH_4 emission. The continuous decrease of flooding days caused by anthropogenic disturbances may induce soil C loss in Dongting Lake wetlands.
机译：湿地在减轻碳排放方面发挥着关键作用。然而，对土壤碳排放及其来自内陆洪泛区湿地的环境控制很少。本研究旨在确定水文和仿乳管控制器（水台深度[WTD]，土壤温度[TS]和土壤含水量[SWC]）对洞庭湖湿地土壤C的影响。在2013年至2014年，使用静态腔室在Carex Meadow和Mudflat中测量了一年的排放，包括非全污水季节（NFS）和洪水季节（FS）。结果表明，Carex草甸和Mudflat中的土壤C发射分别为307.8和264.3g C·m〜（-2）··年〜（-1），NFS期间排放50-66％的土壤C.与NFS相比，CAREX草地上的FS期间，CO_2排放量明显下降了57％，但CH_4排放量明显增加38次。逐步回归与结构方程模型分析组合显示，CO_2和CH_4通量主要受NFS期间TS的影响，并且在FS期间通过水温（TW）控制。在NFS期间，CO_2助焊剂随着TS和SWC的增加而增加，但是当SWC分别在Carex草甸和Mudflat中分别在66％和52％的情况下显着降低。 CH_4通量显示SWC的发射脉冲分别为65％和17.2°C。这些结果表明，洪水显着抑制了土壤CO_2排放，但刺激了CH_4排放。人为干扰引起的洪水日的持续减少可能会诱导洞庭湖湿地的土壤C损失。

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    Zhengmiao Deng; Youzhi Li; Yonghong Xie; Changhui Peng; Xinsheng Chen; Feng Li; Yijie Ren; Baihan Pan; Chengyi Zhang;

  • 作者单位

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    College of Bioscience and Biotechnology Hunan Agricultural University Changsha China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    Department of Biology Science Institute of Environment Sciences University of Quebec at Montreal Montreal Quebec Canada;

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    Key Laboratory of Agro-ecological Processes in Subtropical Region The Chinese Academy of Sciences Changsha China;

    National Climate Center China Meteorological Administration Beijing China;

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  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Hydrologic; Edaphic Controls; Soil Carbon;

    机译：水文;仿乳管;土壤碳;

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