Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15284 |
The CO2‐equivalent balance of freshwater ecosystems is non‐linearly related to productivity | |
Charlotte Grasset; Sebastian Sobek; Kristin Scharnweber; Simone Moras; Holger Villwock; Sara Andersson; Carolin Hiller; Anna C. Nydahl; Fernando Chaguaceda; William Colom; Lars J. Tranvik | |
2020-08-08 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | Eutrophication of fresh waters results in increased CO2 uptake by primary production, but at the same time increased emissions of CH4 to the atmosphere. Given the contrasting effects of CO2 uptake and CH4 release, the net effect of eutrophication on the CO2‐equivalent balance of fresh waters is not clear. We measured carbon fluxes (CO2 and CH4 diffusion, CH4 ebullition) and CH4 oxidation in 20 freshwater mesocosms with 10 different nutrient concentrations (total phosphorus range: mesotrophic 39 µg/L until hypereutrophic 939 µg/L) and planktivorous fish in half of them. We found that the CO2‐equivalent balance had a U‐shaped relationship with productivity, up to a threshold in hypereutrophic systems. CO2‐equivalent sinks were confined to a narrow range of net ecosystem production (NEP) between 5 and 19 mmol O2 m−3 day−1. Our findings indicate that eutrophication can shift fresh waters from sources to sinks of CO2‐equivalents due to enhanced CO2 uptake, but continued eutrophication enhances CH4 emission and transforms freshwater ecosystems to net sources of CO2‐equivalents to the atmosphere. Nutrient enrichment but also planktivorous fish presence increased productivity, thereby regulating the resulting CO2‐equivalent balance. Increasing planktivorous fish abundance, often concomitant with eutrophication, will consequently likely affect the CO2‐equivalent balance of fresh waters. |
领域 | 气候变化 ; 资源环境 |
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/287675 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Charlotte Grasset,Sebastian Sobek,Kristin Scharnweber,等. The CO2‐equivalent balance of freshwater ecosystems is non‐linearly related to productivity[J]. Global Change Biology,2020. |
APA | Charlotte Grasset.,Sebastian Sobek.,Kristin Scharnweber.,Simone Moras.,Holger Villwock.,...&Lars J. Tranvik.(2020).The CO2‐equivalent balance of freshwater ecosystems is non‐linearly related to productivity.Global Change Biology. |
MLA | Charlotte Grasset,et al."The CO2‐equivalent balance of freshwater ecosystems is non‐linearly related to productivity".Global Change Biology (2020). |
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