上游溪流网络中的落叶层分解物候学受地下水热机制和落叶层类型的影响

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Danielle K. Hare, Ashley M. Helton, Carolyn S. Cummins, Phillip M. Bumpers, Nathan J. Tomczyk, Phoenix A. Rogers, Seth J. Wenger, Erin R. Hotchkiss, Amy D. Rosemond, Jonathan P. Benstead
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引用次数: 0

摘要

森林溪流的颗粒有机碳输入主要来自落叶。利用数据信息模拟,我们探讨了枯落物类型(慢分解与快分解物种)、秋季脉冲式枯落物输入、地下水介导的温度机制以及气候变暖如何影响三阶溪流网络中的枯落物分解。我们发现,这些变量之间随时间变化的相互作用影响着网络尺度的垃圾分解物候学,在当前和未来的情景下,慢分解垃圾的热敏感性更高。地下水热输入通过降低春季和夏季垃圾分解通量、提高冬季垃圾分解通量,改变了垃圾分解物候学。在未来气候变暖的情况下,地下水的来源深度会影响夏季的碎屑资源;浅层地下水注入的溪流与深层地下水注入的溪流相比,夏季的碎屑资源会减少。我们的研究结果表明,预测溪流中的碳循环需要明确考虑资源输入的物候和环境因素的季节性时间,特别是溪流的热制度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Leaf litter breakdown phenology in headwater stream networks is modulated by groundwater thermal regimes and litter type

Leaf litter breakdown phenology in headwater stream networks is modulated by groundwater thermal regimes and litter type

Leaf litter dominates particulate organic carbon inputs to forest streams. Using data-informed simulations, we explored how litter type (slow- vs. fast-decomposing species), pulsed autumn litter inputs, groundwater-mediated temperature regimes, and climate warming affect litter breakdown in a 3rd-order stream network. We found that the time-dependent interactions of these variables govern network-scale litter breakdown phenology, with greater thermal sensitivity of slow-decomposing litter for both current and future scenarios. Groundwater thermal inputs modified litter breakdown phenology by reducing spring and summer and elevating winter litter breakdown fluxes. Under future warming scenarios, the source depth of contributing groundwater influenced summer detrital resources; shallow groundwater-fed streams had reduced summer resources compared to deep groundwater-fed streams. Our results demonstrate that predicting in-stream carbon cycling requires explicit consideration of the phenology of resource inputs and the seasonal timing of environmental factors, notably stream thermal regimes.

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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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