Limited biogeochemical modification of surface waters by kelp forest canopies: Influence of kelp metabolism and site‐specific hydrodynamics
Limited biogeochemical modification of surface waters by kelp forest canopies: Influence of kelp metabolism and site‐specific hydrodynamics
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海带森林冠层对地表水的有限生物地球化学改变：海带代谢和特定地点流体动力学的影响
DOI：
10.1002/lno.11999
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发表时间：
2021
影响因子：
4.5
通讯作者：
Monismith, Stephen G.
中科院分区：
文献类型：
--
作者：
Traiger, Sarah B.;Cohn, Brian;Panos, Demetra;Daly, Margaret;Hirsh, Heidi K.;Martone, Maria;Gutierrez, Isabella;Mucciarone, David A.;Takeshita, Yuichiro;Monismith, Stephen G.
气候变化导致沿海生态系统pH值和溶解氧（DO）下降。形成冠层的巨型海带可以通过光合作用局部增加DO和pH值，预计在大部分海带生物质所在的表面沃茨中效果最明显。然而，有限的观察是从沃茨在树冠和测量深度显示有限的潜力，巨型海带改善化学条件。我们量化了表面生物地球化学的时空变异性，并评估了生物和物理驱动因素在2019年夏季加州蒙特雷湾两个海带森林内外水动力学不同的两个位置的pH值和DO变化中的作用。pH值，溶解氧，溶解无机碳（DIC）和温度进行了测量，在表面和附近，结合物理参数（电流和压力），营养物质，浮游植物和海带生物过程的指标。溶解氧和pH值最高，较低的DIC，在表面内海带林。然而，海带森林内外的差异很小（海带中的DO为6- 8%，pH值为0.05）。海带森林具有较低的显着波高和较慢的电流有较大的修改表面的生物地球化学较大的昼夜变化和略高的平均溶解氧和pH值，尽管较低的海带生长速率。海带森林和近海地区之间的差异不是由营养物质或浮游植物驱动的。虽然海带有明显的影响，海洋地球化学，这是由流体动力学调制，小幅度和空间范围的影响限制了潜在的海带森林，以减轻酸化和缺氧。
Climate change is causing decreases in pH and dissolved oxygen (DO) in coastal ecosystems. Canopy‐forming giant kelp can locally increase DO and pH through photosynthesis, with the most pronounced effect expected in surface waters where the bulk of kelp biomass resides. However, limited observations are available from waters in canopies and measurements at depth show limited potential of giant kelp to ameliorate chemical conditions. We quantified spatiotemporal variability of surface biogeochemistry and assessed the role of biological and physical drivers in pH and DO modification at two locations differing in hydrodynamics inside and outside of two kelp forests in Monterey Bay, California in summer 2019. pH, DO, dissolved inorganic carbon (DIC), and temperature were measured at and near the surface, in conjunction with physical parameters (currents and pressure), nutrients, and metrics of phytoplankton and kelp biological processes. DO and pH were highest, with lower DIC, at the surface inside kelp forests. However, differences inside vs. outside of kelp forests were small (DO 6–8%, pH 0.05 higher in kelp). The kelp forest with lower significant wave height and slower currents had greater modification of surface biogeochemistry as indicated by larger diel variation and slightly higher mean DO and pH, despite lower kelp growth rates. Differences between kelp forests and offshore areas were not driven by nutrients or phytoplankton. Although kelp had clear effects on biogeochemistry, which were modulated by hydrodynamics, the small magnitude and spatial extent of the effect limits the potential of kelp forests to mitigate acidification and hypoxia.
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影响因子：
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