Hydrology, rather than wildfire burn extent, determines post-fire organic and black carbon export from mountain rivers in central coastal California

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2023-10-18 DOI:10.1002/lol2.10360
Riley Barton, Christina M. Richardson, Evelyn Pae, Maya S. Montalvo, Michael Redmond, Margaret A. Zimmer, Sasha Wagner
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Abstract

Coastal mountain rivers export disproportionately high quantities of terrestrial organic carbon (OC) directly to the ocean, feeding microbial communities and altering coastal ecology. To better predict and mitigate the effects of wildfires on aquatic ecosystems and resources, we must evaluate the relationships between fire, hydrology, and carbon export, particularly in the fire-prone western United States. This study examined the spatiotemporal export of particulate and dissolved OC (POC and DOC, respectively) and particulate and dissolved black carbon (PBC and DBC, respectively) from five coastal mountain watersheds following the 2020 CZU Lightning Complex Fires (California, USA). Despite high variability in watershed burn extent (20–98%), annual POC, DOC, PBC, and DBC concentrations remained relatively stable among the different watersheds. Instead, they correlated significantly with watershed discharge. Our findings indicate that hydrology, rather than burn extent, is a primary driver of post-fire carbon export in coastal mountain watersheds.

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决定加利福尼亚中部沿海山区河流火后有机碳和黑碳输出的是水文,而不是野火燃烧范围
沿海山区河流向海洋直接输出了大量陆地有机碳 (OC),为微生物群落提供了养料并改变了沿海生态。为了更好地预测和减轻野火对水生生态系统和资源的影响,我们必须评估火灾、水文和碳输出之间的关系,尤其是在火灾多发的美国西部。本研究考察了 2020 年 CZU 闪电复合火灾(美国加利福尼亚州)后五个沿海山区流域的颗粒和溶解 OC(分别为 POC 和 DOC)以及颗粒和溶解黑碳(分别为 PBC 和 DBC)的时空输出情况。尽管流域燃烧范围变化很大(20-98%),但不同流域的年 POC、DOC、PBC 和 DBC 浓度保持相对稳定。相反,它们与流域排水量有显著的相关性。我们的研究结果表明,水文而非燃烧范围是沿海山区流域火灾后碳输出的主要驱动因素。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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