Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1921689117 |
Upper Midwest lakes are supersaturated with N-2 | |
Loeks-Johnson, Brianna M.; Cotner, James B. | |
2020-07-06 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:29页码:17063-17067 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Little is known about the exchange of gaseous nitrogen (N-2) with the atmosphere in freshwater systems. Although the exchange of N-2, driven by excess or deficiencies relative to saturation values, has little relevance to the atmospheric N-2 pool due to its large size, it does play an important role in freshwater and marine nitrogen (N) cycling. N-fixation converts N-2 to ammonia, which can be used by microbes and phytoplankton, while denitrification/anammox effectively removes it by converting oxidized, inorganic N to N-2. We examined N-2 saturation to infer net biological nitrogen processes in 34 lakes across 5 degrees latitude varying in trophic status, mixing re-gime, and bathymetry. Here, we report that nearly all lakes exam-ined in the upper Midwest (USA) were supersaturated with N-2 ( 85% of samples, n = 248), suggesting lakes are continuously re-leasing nitrogen to the atmosphere. The traditional paradigm is that freshwaters compensate for N-limitation through N-fixation, but these results indicate that lakes were constantly losing N to the atmosphere via denitrification and/or anammox, suggesting that terrestrial N inputs are needed to balance the internal N cycle. |
英文关键词 | denitrification nitrogen fixation nitrogen cycling biogeochemistry |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000553292900025 |
WOS关键词 | GLOBAL CARBON-CYCLE ; FRESH-WATER ; NITROUS-OXIDE ; EUTROPHIC LAKE ; DENITRIFICATION ; PHOSPHORUS ; CLIMATE ; TEMPERATURE ; LIMITATION ; FIXATION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/282736 |
专题 | 资源环境科学 |
作者单位 | Univ Minnesota, Dept Ecol Evolut & Behav, St Paul, MN 55108 USA |
推荐引用方式 GB/T 7714 | Loeks-Johnson, Brianna M.,Cotner, James B.. Upper Midwest lakes are supersaturated with N-2[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(29):17063-17067. |
APA | Loeks-Johnson, Brianna M.,&Cotner, James B..(2020).Upper Midwest lakes are supersaturated with N-2.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(29),17063-17067. |
MLA | Loeks-Johnson, Brianna M.,et al."Upper Midwest lakes are supersaturated with N-2".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.29(2020):17063-17067. |
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