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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nitrogen input weakens the control of inundation frequency on soil organic carbon loss in a tidal salt marsh
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Nitrogen input weakens the control of inundation frequency on soil organic carbon loss in a tidal salt marsh

机译：氮气输入削弱了潮盐沼泽土壤有机碳损失对淹没频率的控制

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摘要

The soil carbon (C) sequestration capacity of salt marshes is of considerable importance with respect to the mitigatiing the potentially detrimental consequences of global climate change. Given that tidal salt marshes are subjected to periodic cycles of inundation, it is assumed that soil C cycle in these marshes is expected to be controlled to varing extent by changes in soil moisture and salinity induced by the alternating patterns of drying and rewetting. In addition, with increases in the extent and severity of nitrogen (N) eutrophication becomes serious, we predicted that soil organic carbon (SOC) loss in tidal salt marshes is likely to be highly responsive to increased N loading. In this study, we conducted a two-factor mesocosm experiment (simulated inundation and N input in a tidal salt marsh) to determine the interactive effects of N eutrophication and inundation frequency on CO2 and CH4 emissions and dissolved organic carbon (DOC) contents. Our results showed that increased inundation frequency led to lower levels of CO2 emission but greater CH4 emission, whereas N input weakened the effects of changes in inundation frequency on CO2 and CH4 emissions. Moreover, N input was found to modify CO2 and CH4 emission in response to variations in soil moisture. We also observed an enhancement of soil DOC loss in response to increasing inundation frequency, and that DOC loss in the surface soil was considerably greater than that in subsurface soil. Further, as inundation frequency increased, we detected changes in the relationship between soil DOC and CO2 and CH4. Our findings highlighted that vertical variation in soil moisture induced by inundation is a key factor controlling SOC loss in tidal salt marshes, although N input can weaken this control.
机译：盐沼的土壤碳（C）封存能力对于全球气候变化的潜在不利后果而言，盐沼的封存能力相当重要。鉴于潮热沼沼泽经过周期性的淹没，假设这些沼泽中的土壤C循环预计将通过干燥和重污染的交替模式诱导的土壤水分和盐度变化来控制变化程度。此外，随着氮的程度和严重程度的增加（n）富营养化变得严重，我们预测潮盐沼的土壤有机碳（SoC）损失可能对N加载量的高度敏感性很高。在这项研究中，我们进行了双因素Mesocosm实验（模拟淹没和潮气沼泽中的N个输入），以确定N富营养化和淹没频率对CO 2和CH 4排放和溶解有机碳（DOC）含量的交互作用。我们的研究结果表明，增加的淹没频率导致了较低的CO 2排放量，但CH4排放较大，而N次输入削弱了淹没频率变化对CO2和CH4排放的影响。此外，发现N个输入以响应土壤水分的变化来改变CO2和CH4发射。我们还观察到响应越来越多的淹没频率而增强土壤DOC损失，并且表面土壤中的DOC损失大大大于地下土壤。此外，随着淹没频率的增加，我们检测到土壤DOC和CO2和CH4之间的关系的变化。我们的研究结果强调，淹没诱导的土壤水分的垂直变化是控制潮盐沼泽中SOC损失的关键因素，尽管N个输入可以削弱这种控制。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2020年第30期|106878.1-106878.10|共10页
  • 作者

    Li Juanyong; Han Guangxuan; Zhao Mingliang; Qu Wendi; Nie Ming; Song Weimin; Xie Baohua; Eller Franziska;

  • 作者单位

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci 7 Nanhai Rd Qingdao 266071 Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China|Southwest Univ Coll Resources & Environm Key Lab Ecoenvironm Three Gorges Reservoir Reg Minist Educ Chongqing 400715 Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Fudan Univ Minist Educ Key Lab Biodivers Sci & Ecol Engn 2005 Songhu Rd Shanghai 200438 Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China;

    Chinese Acad Sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Yantai 264003 Shandong Peoples R China|YICCAS Shandong Key Lab Coastal Environm Proc Yantai 264003 Shandong Peoples R China;

    Aarhus Univ Dept Biosci Ole Worms Alle 1 DK-8000 Aarhus C Denmark;

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  • 正文语种 eng
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  • 关键词

    Tidal salt marsh; Nitrogen input; Inundation frequency; Soil CO2 and CH4 emissions; Soil DOC loss;

    机译：潮盐沼;氮气投入;淹没频率;土壤二氧化碳和CH4排放;土壤DOC损失;

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