Nutrient management offsets the effect of deoxygenation and warming on nitrous oxide emissions in a large US estuary

IF 11.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Weiyi Tang, Fei Da, John C. Tracey, Naomi Intrator, Moriah A. Kunes, Jenna A. Lee, Xianhui Sean Wan, Amal Jayakumar, Marjorie A. M. Friedrichs, Bess B. Ward
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Abstract

Many estuaries experience eutrophication, deoxygenation and warming, with potential impacts on greenhouse gas emissions. However, the response of N2O production to these changes is poorly constrained. Here we applied nitrogen isotope tracer incubations to measure N2O production under experimentally manipulated changes in oxygen and temperature in the Chesapeake Bay—the largest estuary in the United States. N2O production more than doubled from nitrification and increased exponentially from denitrification when O2 was decreased from >20 to <5 micromolar. Raising temperature from 15° to 35°C increased N2O production 2- to 10-fold. Developing a biogeochemical model by incorporating these responses, N2O emissions from the Chesapeake Bay were estimated to decrease from 157 to 140 Mg N year−1 from 1986 to 2016 and further to 124 Mg N year−1 in 2050. Although deoxygenation and warming stimulate N2O production, the modeled decrease in N2O emissions, attributed to decreased nutrient inputs, indicates the importance of nutrient management in curbing greenhouse gas emissions, potentially mitigating climate change.

Abstract Image

在美国一个大河口,营养物管理抵消了脱氧和变暖对氧化亚氮排放的影响
许多河口经历富营养化、脱氧和变暖,对温室气体排放有潜在影响。然而,二氧化氮产量对这些变化的响应却没有得到很好的约束。在这里,我们应用氮同位素示踪剂孵育来测量在实验控制的氧气和温度变化下切萨皮克湾(美国最大的河口)的二氧化氮产量。当o2从20微摩尔降低到5微摩尔时,硝化产氮量增加了一倍以上,反硝化产氮量呈指数增长。将温度从15°C提高到35°C,二氧化氮产量增加了2- 10倍。通过结合这些响应开发生物地球化学模型,估计切萨皮克湾的n2o排放量从1986年至2016年从157 Mg N减少到140 Mg N,到2050年进一步减少到124 Mg N。虽然脱氧和变暖刺激了氮氧生成,但模拟的氮氧排放减少(归因于养分投入减少)表明了养分管理在抑制温室气体排放方面的重要性,从而有可能减缓气候变化。
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来源期刊
Science Advances
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.
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