Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15193 |
Snow melt stimulates ecosystem respiration in Arctic ecosystems | |
Kyle A. Arndt; David A. Lipson; Josh Hashemi; Walter C. Oechel; Donatella Zona | |
2020-06-30 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | Cold seasons in Arctic ecosystems are increasingly important to the annual carbon balance of these vulnerable ecosystems. Arctic winters are largely harsh and inaccessible leading historic data gaps during that time. Until recently, cold seasons have been assumed to have negligible impacts on the annual carbon balance but as data coverage increases and the Arctic warms, the cold season has been shown to account for over half of annual methane (CH4) emissions and can offset summer photosynthetic carbon dioxide (CO2) uptake. Freeze–thaw cycle dynamics play a critical role in controlling cold season CO2 and CH4 loss, but the relationship has not been extensively studied. Here, we analyze freeze–thaw processes through in situ CO2 and CH4 fluxes in conjunction with soil cores for physical structure and porewater samples for redox biogeochemistry. We find a movement of water toward freezing fronts in soil cores, leaving air spaces in soils, which allows for rapid infiltration of oxygen‐rich snow melt in spring as shown by oxidized iron in porewater. The snow melt period coincides with rising ecosystem respiration and can offset up to 41% of the summer CO2 uptake. Our study highlights this important seasonal process and shows spring greenhouse gas emissions are largely due to production from respiration instead of only bursts of stored gases. Further warming is projected to result in increases of snowpack and deeper thaws, which could increase this ecosystem respiration dominate snow melt period causing larger greenhouse gas losses during spring. |
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/281753 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Kyle A. Arndt,David A. Lipson,Josh Hashemi,et al. Snow melt stimulates ecosystem respiration in Arctic ecosystems[J]. Global Change Biology,2020. |
APA | Kyle A. Arndt,David A. Lipson,Josh Hashemi,Walter C. Oechel,&Donatella Zona.(2020).Snow melt stimulates ecosystem respiration in Arctic ecosystems.Global Change Biology. |
MLA | Kyle A. Arndt,et al."Snow melt stimulates ecosystem respiration in Arctic ecosystems".Global Change Biology (2020). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论