Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13621 |
Long-term enhanced winter soil frost alters growing season CO2 fluxes through its impact on vegetation development in a boreal peatland | |
Zhao, Junbin; Peichl, Matthias; Nilsson, Mats B. | |
2017-08-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden |
英文摘要 | At high latitudes, winter climate change alters snow cover and, consequently, may cause a sustained change in soil frost dynamics. Altered winter soil conditions could influence the ecosystem exchange of carbon dioxide (CO2) and, in turn, provide feedbacks to ongoing climate change. To investigate the mechanisms that modify the peatland CO2 exchange in response to altered winter soil frost, we conducted a snow exclusion experiment to enhance winter soil frost and to evaluate its short-term (1-3 years) and long-term (11 years) effects on CO2 fluxes during subsequent growing seasons in a boreal peatland. In the first 3 years after initiating the treatment, no significant effects were observed on either gross primary production (GPP) or ecosystem respiration (ER). However, after 11 years, the temperature sensitivity of ER was reduced in the treatment plots relative to the control, resulting in an overall lower ER in the former. Furthermore, early growing season GPP was also lower in the treatment plots than in the controls during periods with photosynthetic photon flux density (PPFD) >= 800 mu mol m(-2) s(-1), corresponding to lower sedge leaf biomass in the treatment plots during the same period. During the peak growing season, a higher GPP was observed in the treatment plots under the low light condition (i.e. PPFD 400 mu mol m(-2) s(-1)) compared to the control. As Sphagnum moss maximizes photosynthesis at low light levels, this GPP difference between the plots may have been due to greater moss photosynthesis, as indicated by greater moss biomass production, in the treatment plots relative to the controls. Our study highlights the different responses to enhanced winter soil frost among plant functional types which regulate CO2 fluxes, suggesting that winter climate change could considerably alter the growing season CO2 exchange in boreal peatlands through its effect on vegetation development. |
英文关键词 | biomass carbon dioxide flux climate change gross primary production mire respiration snow cover soil frost |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404863300016 |
WOS关键词 | CARBON-DIOXIDE EXCHANGE ; MICROBIAL RESPIRATION ; PLANT PRODUCTIVITY ; ROOT RESPIRATION ; SPHAGNUM MOSSES ; SNOW DEPTH ; TEMPERATURE ; RESPONSES ; FOREST ; ACCUMULATION |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
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/17084 |
专题 | 气候变化 资源环境科学 |
作者单位 | Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90183 Umea, Sweden |
推荐引用方式 GB/T 7714 | Zhao, Junbin,Peichl, Matthias,Nilsson, Mats B.. Long-term enhanced winter soil frost alters growing season CO2 fluxes through its impact on vegetation development in a boreal peatland[J]. GLOBAL CHANGE BIOLOGY,2017,23(8). |
APA | Zhao, Junbin,Peichl, Matthias,&Nilsson, Mats B..(2017).Long-term enhanced winter soil frost alters growing season CO2 fluxes through its impact on vegetation development in a boreal peatland.GLOBAL CHANGE BIOLOGY,23(8). |
MLA | Zhao, Junbin,et al."Long-term enhanced winter soil frost alters growing season CO2 fluxes through its impact on vegetation development in a boreal peatland".GLOBAL CHANGE BIOLOGY 23.8(2017). |
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