The competing controls of glaciers, precipitation, and vegetation on high-mountain fluvial sediment yields

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-27 DOI:10.1126/sciadv.ads6196

Dongfeng Li, Ting Zhang, Desmond E. Walling, Stuart Lane, Bodo Bookhagen, Shang Tian, Irina Overeem, Jaia Syvitski, Albert J. Kettner, Edward Park, Michèle Koppes, Rafael J. P. Schmitt, Weiling Sun, Jinren Ni, Todd A. Ehlers

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Abstract

Investigating erosion and river sediment yield in high-mountain areas is crucial for understanding landscape and biogeochemical responses to environmental change. We compile data on contemporary fluvial suspended sediment yield (SSY) and 12 environmental proxies from 151 rivers in High Mountain Asia surrounding the Tibetan Plateau. We demonstrate that glaciers exert a first-order control on fluvial SSYs, with high precipitation nonlinearly amplifying their role, especially in high–glacier cover basins. We find a bidirectional response to vegetation’s influence on SSY in the Eastern Tibetan Plateau and Tien Shan and identify that the two interacting factors of precipitation and vegetation cover explain 54% of the variability in SSY, reflecting the divergent roles of vegetation in promoting biogenic-weathering versus slope stabilization across bioclimatic zones. The competing interactions between glaciers, ecosystems, and climate in delivering suspended sediment have important implications for predicting carbon and nutrient exports and water quality in response to future climate change.

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冰川、降水和植被对高山河流沉积物产量的竞争性控制。

调查高山地区的侵蚀和河流沉积量对于了解景观和生物地球化学对环境变化的反应至关重要。我们汇编了青藏高原周围亚洲高山地区 151 条河流的当代河流悬浮泥沙量（SSY）数据和 12 种环境代用指标。我们证明，冰川对河流悬浮泥沙量具有一阶控制作用，高降水量非线性地放大了冰川的作用，尤其是在冰川覆盖率高的流域。我们发现，在青藏高原东部和天山地区，植被对SSY的影响是双向的，降水量和植被覆盖度这两个相互作用的因素解释了SSY变化的54%，反映了植被在促进生物风化和稳定斜坡方面在不同生物气候区的不同作用。冰川、生态系统和气候在输送悬浮沉积物方面的竞争性相互作用对于预测碳和营养物质的输出以及水质对未来气候变化的响应具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.