Extent, patterns, and drivers of hypoxia in the world's streams and rivers
Extent, patterns, and drivers of hypoxia in the world's streams and rivers
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DOI：
10.1002/lol2.10297
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发表时间：
2022-12-08
影响因子：
7.8
通讯作者：
Cohen, Matthew J.
中科院分区：
文献类型：
--
作者：
Blaszczak, Joanna R.;Koenig, Lauren E.;Cohen, Matthew J.
沿海沃茨和湖泊中的缺氧被广泛认为是一个有害的环境问题，但我们缺乏对河流缺氧的类似理解。我们使用来自93个国家的河流中超过125，000个位置的溶解氧（DO）浓度和水温的1.18亿对观测值来研究缺氧控制。我们发现缺氧（DO < 2 mg L-1）在53个国家的所有河流站点中占12.6%，但自1950年以来没有一致的流行趋势。高频数据显示，缺氧事件的平均持续时间为3小时，最有可能在夜间发生。河流属性是更好的预测河流缺氧发生比流域土地覆盖，地形和气候特征。缺氧更容易发生在温暖，较小，低梯度的河流，特别是那些排水城市或湿地土地覆盖。我们的研究结果表明，河流缺氧及其对生态系统的影响可能比以前假设的更普遍。
Hypoxia in coastal waters and lakes is widely recognized as a detrimental environmental issue, yet we lack a comparable understanding of hypoxia in rivers. We investigated controls on hypoxia using 118 million paired observations of dissolved oxygen (DO) concentration and water temperature in over 125,000 locations in rivers from 93 countries. We found hypoxia (DO < 2 mg L-1) in 12.6% of all river sites across 53 countries, but no consistent trend in prevalence since 1950. High-frequency data reveal a 3-h median duration of hypoxic events which are most likely to initiate at night. River attributes were better predictors of riverine hypoxia occurrence than watershed land cover, topography, and climate characteristics. Hypoxia was more likely to occur in warmer, smaller, and lower-gradient rivers, particularly those draining urban or wetland land cover. Our findings suggest that riverine hypoxia and the resulting impacts on ecosystems may be more pervasive than previously assumed.