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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Geomorphology and climate interact to control organic carbon stock and age in mountain river valley bottoms
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Geomorphology and climate interact to control organic carbon stock and age in mountain river valley bottoms

机译：地貌和气候互动，以控制山区河流谷底的有机碳储量和年龄

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摘要

Organic carbon (OC) in valley bottom downed wood and soil that cycles over short to moderate timescales (10(1) to 10(5) years) represents a large, dynamic, and poorly quantified pool of carbon whose distribution and residence time affects global climate. We sought to quantify this potentially important OC pool at the watershed scale to estimate its magnitude and age, as well as determine the controls on its variability within watersheds. To do this, we compared four disparate mountain river basins to show that mountain river valley bottoms store substantial estimated OC stocks in floodplain soil and downed wood (median OC of 127.3-37.4+24.5 MgC/ha, n = 178). Although soil OC is generally young (exhibiting a median radiocarbon fraction modern value of 0.97-0.01+0.02, n = 121), geomorphic processes regulate soil burial and processes that limit microbial respiration, preserving aged OC in especially deep, unconfined, wet, and/or high-elevation floodplain soils. We statistically modeled OC stocks to show that valley bottom morphology and hydrology regulate variability in floodplain soil retention and resulting variability in OC stock and age in floodplain soil throughout river networks. Comparing the distribution of OC stocks between wood and soil, we find that where floodplain soils are present, their OC stocks are generally greater than OC stocks stored in wood. Our results suggest that although mountain rivers may accumulate large OC stocks relatively rapidly, those stocks are highly sensitive to alterations in soil and wood retention, implying that human alterations to either disturb or restore floodplain wood and soil storage may have substantial impacts on OC storage in river corridors. (c) 2020 John Wiley & Sons, Ltd.
机译：谷底的有机碳（OC）底部倒下的木材和土壤，循环短到适度的时间尺度（10（1）至10（5）年）代表了一个大，动态，且量化的碳池，其分布和停留时间影响全球气候。我们试图在流域规模上量化这一潜在的重要OC池，以估计其幅度和年龄，以及确定流域内变异性的控制。为此，我们将四个不同的山区河流盆地比较了山区河流谷底储存大量估计的洪水土壤和羽绒服（127.3-37.4 + 24.5 mgc / ha，n = 178）。虽然土壤oc一般年轻（表现出中值的radiocarbon零件值为0.97-0.01 + 0.02，n = 121），但地貌过程调节土壤埋藏和过程限制微生物呼吸，尤其是深，无束，潮湿，湿润的老年oc保存。 /或高海拔洪泛区土壤。我们在统计上建模的OC股表明，谷底形态和水文规管洪泛区土壤保留的可变性以及河流网络洪泛区土壤中的oc股和年龄的变异性。比较木材和土壤之间的oc股的分布，发现在存在洪泛土壤的情况下，他们的OC库存通常大于储存在木材中的OC股。我们的结果表明，尽管山区河流相对迅速积累大型oc库存，但这些股票对土壤和木材保留的改变非常敏感，这意味着人类改变对扰动或恢复洪泛平铺木材和土壤储存可能对OC储存有很大影响河走廊。 （c）2020 John Wiley＆Sons，Ltd。

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