Long‐Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics
Long‐Term Changes in Concentration and Yield of Riverine Dissolved Silicon From the Poles to the Tropics
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从两极到热带河流溶解硅浓度和产量的长期变化
DOI：
10.1029/2022gb007678
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发表时间：
2023
影响因子：
5.2
通讯作者：
McDowell, William H.
中科院分区：
文献类型：
--
作者：
Jankowski, Kathi Jo;Johnson, Keira;Sethna, Lienne;Julian, Paul;Wymore, Adam S.;Shogren, Arial J.;Thomas, Patrick K.;Sullivan, Pamela L.;McKnight, Diane M.;McDowell, William H.
河流出口的硅(Si)通过海洋硅藻的生长影响全球碳循环，海洋硅藻占全球初级生产量的25%。气候变化可能会以生物群特有的方式改变河流硅的输出，这是由于水生和陆地系统的化学风化速率、水文连通性和新陈代谢过程的相互作用的变化。尽管如此，推动硅出口长期变化的因素在当地、地区和全球范围内仍未得到探索。我们使用来自全球60条河流和溪流的长期数据集(例如，南极、热带、温带、北方、高山、北极系统)，评估了在过去几十年快速气候变暖期间，溶解硅(DSi)的浓度和产量是如何变化的。我们表明，河流DSi浓度和产量已经发生了广泛的变化，其中最大的变化发生在高山和极地地区。在生物群落内部和之间，趋势的大小和方向各不相同，与土地覆盖的差异关系最大，而且往往与河流流量的变化无关。这些发现表明，可能存在多种机制推动跨越陆地-水界面的河流硅生物地球化学变化，其中可能包括冰川融化、陆地植被变化和河流生产力。最后，在生长季节以外的月份，趋势往往更强，特别是在温带和北方系统，这表明季节性变化对河流硅通量具有潜在的重要作用。我们的结果对河流中二氧化硅加工的时间和规模以及向全球海洋的输送具有一定的影响。
Riverine exports of silicon (Si) influence global carbon cycling through the growth of marine diatoms, which account for ∼25% of global primary production. Climate change will likely alter river Si exports in biome‐specific ways due to interacting shifts in chemical weathering rates, hydrologic connectivity, and metabolic processes in aquatic and terrestrial systems. Nonetheless, factors driving long‐term changes in Si exports remain unexplored at local, regional, and global scales. We evaluated how concentrations and yields of dissolved Si (DSi) changed over the last several decades of rapid climate warming using long‐term data sets from 60 rivers and streams spanning the globe (e.g., Antarctic, tropical, temperate, boreal, alpine, Arctic systems). We show that widespread changes in river DSi concentration and yield have occurred, with the most substantial shifts occurring in alpine and polar regions. The magnitude and direction of trends varied within and among biomes, were most strongly associated with differences in land cover, and were often independent of changes in river discharge. These findings indicate that there are likely diverse mechanisms driving change in river Si biogeochemistry that span the land‐water interface, which may include glacial melt, changes in terrestrial vegetation, and river productivity. Finally, trends were often stronger in months outside of the growing season, particularly in temperate and boreal systems, demonstrating a potentially important role of shifting seasonality for the flux of Si from rivers. Our results have implications for the timing and magnitude of silica processing in rivers and its delivery to global oceans.
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影响因子：
16.6
作者：
Feng D;Gleason CJ;Lin P;Yang X;Pan M;Ishitsuka Y
通讯作者：
Ishitsuka Y
高山环境中加速风化和硫酸盐输出的证据
影响因子：
6.7
作者：
Crawford, John T.;Hinckley, Eve-Lyn S.;Litaor, M. Iggy;Brahney, Janice;Neff, Jason C.
通讯作者：
Neff, Jason C.
DOI：
10.3133/tm4a10
发表时间：
2015
期刊：
Techniques and Methods
影响因子：
--
作者：
R. Hirsch;L. D. Cicco
通讯作者：
R. Hirsch;L. D. Cicco
两个农业流域的硅浓度和化学计量：对管理和下游水质的影响
影响因子：
4
作者：
L. Sethna;T. Royer;Shannon L. Speir;Matt T. Trentman;Ursula H. Mahl;Lea Hagemeier;J. Tank
通讯作者：
J. Tank
影响因子：
5
作者：
Cornelis, J. -T.;Delvaux, B.;Opfergelt, S.
通讯作者：
Opfergelt, S.