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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Topographic influences on wildfire consumption of soil organic carbon in interior Alaska: Implications for black carbon accumulation
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Topographic influences on wildfire consumption of soil organic carbon in interior Alaska: Implications for black carbon accumulation

机译：地形对阿拉斯加内部土壤有机碳野火消耗的影响：对黑碳积累的影响

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摘要

We measured characteristics of soil organic carbon (SOC) and black carbon (BC) along opposed north- and south-facing toposequences in recent (2004) and old (～1860–1950) burn sites throughout interior Alaska. Surface fuel consumption did not vary between different topographic positions, with 3.3 (±0.5) kg C m?2 being consumed on toe slope sites, 4.0 (±0.2) kg C m?2 on north-slope sites, and 3.6 (±0.3) kg C m?2 on south-slope sites. On a relative scale, 43% of the organic matter depth was removed through biomass burning on toe slopes, 62% on north-slopes, and 77% on south-slope sites. Mineral soil BC stocks (measured using a chemical/thermal oxidation method isolating more graphitic BC) ranged from 112 ± 24 g C m?2 to 173 ± 43 g C m?2 on north- and south-facing aspects, respectively. These data supported the expectation that deeper and wetter ground fuels occurring in north-facing and toe-slope forests burned less completely, which decreased the amount of BC incorporated into mineral soil where it could be protected from subsequent fires. Thus, warmer and drier forests harbored less total SOC, but following wildfire aggraded larger BC stocks. BC was therefore an important component of stable soil C in warmer and drier forests which had higher C turnover rates in other soil pools (determined by density fractionation, δ 13C, and Δ14C). These data provide a basis for understanding how variable patterns of organic layer depths and soil moisture mediate the consumption of SOC in wildfire, as well as the long-term accumulation of BC.
机译：我们测量了阿拉斯加内部最近（2004年）和旧（〜1860年至1950年）燃点的相对有机碳和黑碳的特征，这些碳沿相反的北向和南向概率发生。表面燃料消耗在不同的地形位置之间没有变化，在脚趾坡地消耗3.3（±0.5）kg C m？2，在北坡坡地消耗4.0（±0.2）kg C m？2，和3.6（±0.3） ）kg C m？2在南坡站点。在相对规模上，通过在脚趾坡上燃烧生物质去除了有机物深度的43％，在北坡上去除了62％，在南坡上去除了77％。矿质土壤的BC储量（使用化学/热氧化方法测量，分离出更多的石墨BC）在朝北和朝南方面分别为112±24 g C m？2至173±43 g C m？2。这些数据支持了这样的期望，即在朝北和脚趾坡林中产生的更深和更湿的地面燃料燃烧得不太完全，从而减少了掺入矿质土壤中的BC含量，可以保护其免受后续大火的伤害。因此，较温暖和干燥的森林总有机碳含量较低，但野火导致卑诗省森林蓄积量增加。因此，BC是温暖和干燥森林中稳定土壤C的重要组成部分，而在其他土壤池中C的周转率更高（由密度分馏，δ13C和Δ14C确定）。这些数据为了解有机层深度和土壤水分的可变模式如何介导野火中SOC的消耗以及BC的长期积累提供了基础。

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