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DOI | 10.1002/esp.4680 |
How geomorphic context governs the influence of wildfire on floodplain organic carbon in fire-prone environments of the western United States | |
Wohl, Ellen1; Lininger, Katherine B.2; Rathburn, Sara L.1; Sutfin, Nicholas A.3 | |
发表日期 | 2019 |
ISSN | 0197-9337 |
EISSN | 1096-9837 |
英文摘要 | We draw on published studies of floodplain organic carbon storage, wildfire-related effects on floodplains in temperate and high latitudes, and case studies to propose a conceptual model of the effects of wildfire on floodplain organic carbon storage in relation to climate and valley geometry. Soil organic carbon typically constitutes the largest carbon stock in floodplains in fire-prone regions, although downed wood can contain significant organic carbon. We focus on the influence of wildfire on soil organic carbon and downed wood as opposed to standing vegetation to emphasize the geomorphic influences resulting from wildfire on floodplain organic carbon stocks. The net effect of wildfire varies depending on site-specific characteristics including climate and valley geometry. Wildfire is likely to reduce carbon stock in steep, confined valley segments because increased water and sediment yields following fire create net floodplain erosion. The net effect of fire in partly confined valleys depends on site-specific interactions among floodplain aggradation and erosion, and, in high-latitude regions, permafrost degradation. In unconfined valleys in temperate latitudes, wildfire is likely to slightly increase floodplain organic carbon stock as a result of floodplain aggradation and wood deposition. In unconfined valleys in high latitudes underlain by permafrost, wildfire is likely in the short-term to significantly decrease floodplain organic carbon via permafrost degradation and reduce organic-layer thickness. Permafrost degradation reduces floodplain erosional resistance, leading to enhanced stream bank erosion and greater carbon fluxes into channels. The implications of warming climate and increased wildfires for floodplain organic carbon stock thus vary. Increasing wildfire extent, frequency, and severity may result in significant redistribution of organic carbon from floodplains to the atmosphere via combustion in all environments examined here, as well as redistribution from upper to lower portions of watersheds in the temperate zone and from floodplains to the oceans via riverine transport in the high-latitudes. (c) 2019 John Wiley & Sons, Ltd. |
WOS研究方向 | Physical Geography ; Geology |
来源期刊 | EARTH SURFACE PROCESSES AND LANDFORMS
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/100413 |
作者单位 | 1.Colorado State Univ, Dept Geosci, Ft Collins, CO 80523 USA; 2.Univ Colorado, Dept Geog, Boulder, CO 80309 USA; 3.Case Western Reserve Univ, Dept Earth Environm & Planetary Sci, Cleveland, OH 44106 USA |
推荐引用方式 GB/T 7714 | Wohl, Ellen,Lininger, Katherine B.,Rathburn, Sara L.,et al. How geomorphic context governs the influence of wildfire on floodplain organic carbon in fire-prone environments of the western United States[J],2019. |
APA | Wohl, Ellen,Lininger, Katherine B.,Rathburn, Sara L.,&Sutfin, Nicholas A..(2019).How geomorphic context governs the influence of wildfire on floodplain organic carbon in fire-prone environments of the western United States.EARTH SURFACE PROCESSES AND LANDFORMS. |
MLA | Wohl, Ellen,et al."How geomorphic context governs the influence of wildfire on floodplain organic carbon in fire-prone environments of the western United States".EARTH SURFACE PROCESSES AND LANDFORMS (2019). |
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