https://repository.kopri.re.kr/handle/201206/13412 Wed, 15 Apr 2026 04:46:36 GMT 2026-04-15T04:46:36Z https://repository.kopri.re.kr/handle/201206/16277 Title: Environmental drivers of increased ecosystem respiration in a warming tundra Authors: Maes S. L.; Dietrich J.; Midolo G.; Schwieger S.; Kummu M.; Vandvik V.; Aerts R.; Althuizen I. H. J.; Biasi C.; Bjoerk R. G.; Boehner H.; Carbognani M.; Chiari G.; Christiansen C. T.; Clemmensen K. E.; Cooper E. J.; Cornelissen J. H. C.; Elberling B.; Faubert P.; Fetcher N.; Forte T. G. W.; Gaudard J.; Gavazov K.; Guan Z.; Guomundsson J.; Gya R.; Hallin S.; Hansen B. B.; Haugum S. V.; He J. -S.; Hicks Pries C.; Hovenden M. J.; Jalava M.; Jonsdottir I. S.; Juhanson J.; Jung, Ji Young; Kaarlejaervi E.; Kwon M. J.; Lamprecht R. E.; Le Moullec M.; Lee H.; Marushchak M. E.; Michelsen A.; Munir T. M.; Myrsky E. M.; Nielsen C. S.; Nyberg M.; Olofsson J.; Oskarsson H.; Parker T. C.; Pedersen E. P.; Petit Bon M.; Petraglia A.; Raundrup K.; Ravn N. M. R.; Rinnan R.; Rodenhizer H.; Ryde I.; Schmidt N. M.; Schuur E. A. G.; Sjoegersten S.; Stark S.; Strack M.; Tang J.; Tolvanen A.; Toepper J. P.; Vaeisaenen M. K.; Van Logtestijn R. S. P.; Voigt C.; Walz J.; Weedon J. T.; Yang Y.; Ylaenne H.; Bjoerkman M. P.; Sarneel J. M.; Dorrepaal E. Abstract: Arctic and alpine tundra ecosystems are large reservoirs of organic carbon 1,2 . Climate warming may stimulate ecosystem respiration and release carbon into the atmosphere 3,4 . The magnitude and persistency of this stimulation and the environmental mechanisms that drive its variation remain uncertain 5-7 . This hampers the accuracy of global land carbon-climate feedback projections 7,8 . Here we synthesize 136 datasets from 56 open-top chamber in situ warming experiments located at 28 arctic and alpine tundra sites which have been running for less than 1 year up to 25 years. We show that a mean rise of 1.4 degrees C [confidence interval (CI) 0.9-2.0 degrees C] in air and 0.4 degrees C [CI 0.2-0.7 degrees C] in soil temperature results in an increase in growing season ecosystem respiration by 30% [CI 22-38%] (n = 136). Our findings indicate that the stimulation of ecosystem respiration was due to increases in both plant-related and microbial respiration (n = 9) and continued for at least 25 years (n = 136). The magnitude of the warming effects on respiration was driven by variation in warming-induced changes in local soil conditions, that is, changes in total nitrogen concentration and pH and by context-dependent spatial variation in these conditions, in particular total nitrogen concentration and the carbon:nitrogen ratio. Tundra sites with stronger nitrogen limitations and sites in which warming had stimulated plant and microbial nutrient turnover seemed particularly sensitive in their respiration response to warming. The results highlight the importance of local soil conditions and warming-induced changes therein for future climatic impacts on respiration. Datasets from in situ warming experiments across 28 arctic and alpine tundra sites covering a span of less than 1 year up to 25 years show the importance of local soil conditions and warming-induced changes therein for future climatic impacts on ecosystem respiration. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16277 2024-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/14765 Title: Changes in biogeochemical processes of Arctic terrestrial ecosystem in response to climate change Authors: Jung, Ji Young Tue, 28 Nov 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/14765 2023-11-28T00:00:00Z https://repository.kopri.re.kr/handle/201206/14401 Title: Attenuation of Methane Oxidation by Nitrogen Availability in Arctic Tundra Soils Authors: 이재헌; 윤정은; 양이랑; Jung, Ji Young; Lee, Yoo Kyung; Junji Yuan; Weixin Ding; Chris Freeman; 강호정 Abstract: CH4 emission in the Arctic has large uncertainty due to the lack of mechanistic understanding of the processes. CH4 oxidation in Arctic soil plays a critical role in the process, whereby removal of up to 90% of CH4 produced in soils by methanotrophs can occur before it reaches the atmosphere. Previous studies have reported on the importance of rising temperatures in CH4 oxidation, but because the Arctic is typically an N-limited system, fewer studies on the effects of inorganic nitrogen (N) have been reported. However, climate change and an increase of available N caused by anthropogenic activities have recently been reported, which may cause a drastic change in CH4 oxidation in Arctic soils. In this study, we demonstrate that excessive levels of available N in soil cause an increase in net CH4 emissions via the reduction of CH4 oxidation in surface soil in the Arctic tundra. In vitro experiments suggested that N in the form of NO3？ is responsible for the decrease in CH4 oxidation via influencing soil bacterial and methanotrophic communities. The findings of our meta-analysis suggest that CH4 oxidation in the boreal biome is more susceptible to the addition of N than in other biomes. We provide evidence that CH4 emissions in Arctic tundra can be enhanced by an increase of available N, with profound implications for modeling CH4 dynamics in Arctic regions. Sun, 01 Jan 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/14401 2023-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/14106 Title: Winters are changing: snow effects on Arctic and alpine tundra ecosystems Authors: Christian Rixen; Toke Thomas Høye; Petr Macek; Rien Aerts; Juha Alatalo; Jill T. Anderson; Pieter A. Arnold; Isabel C Barrio; Jarle W. Bjerke; Mats P. Bjorkman; Daan Blok; Gesche Blume-Werry; Julia Boike; Stef Bokhorst; Michele Carbognani; Casper T. Christiansen; Peter Convey; Elisabeth J. Cooper; J. Hans C. Cornelissen; Stephen J Coulson; Ellen Dorrepaal; Bo Elberling; Sarah C. Elmendorf; Cassandra Elphinstone; T'ai Gladys Whittingham Forte; Esther R. Frei; Sonya R. Geange; Friederike Gehrmann; Casey Gibson; Paul Grogan; Aud Helen Halbritter; John Harte; Gregory H.R. Henry; David W. Inouye; Rebecca E. Irwin; Gus Jespersen3; Ingibjorg Svala Jonsdottir; Jung, Ji Young; David Klinges; Gaku Kudo; Juho Lamsa; Hanna Lee; Jonas J. Lembrechts; Signe Lett; Joshua Scott Lynn; Mikhail Mastepanov; Jennifer Morse; Isla H. Myers-Smith; Johan Olofsson; Riku Paavola; Alessandro Petraglia; Gareth K. Phoenix; Hjalte Mads Rosenstand Mann; Philipp Semenchuk; Matthias B. Siewert; Rachel Slatyer; Marko Spasojevic; Katharine Suding; Patrick Sullivan; Kimberly L. Thompson; Maria Vaisanen; Vigdis Vandvik; Susanna Venn; Josefine Walz; Robert Way; Jeffrey M Welker; Sonja Wipf; Shengwei Zong Abstract: Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines ground temperature, light conditions and moisture availability during winter. It also affects the growing season beginning and end, and plant access to moisture and nutrients. Here, we review the current knowledge of the snow cover’s role for vegetation, plant-animal interactions, permafrost conditions, microbial processes and biogeochemical cycling. We also compare studies of natural snow gradients with snow manipulation studies, altering snow depth and duration, to assess time scale difference of these approaches. The number of studies on snow in tundra ecosystems has increased considerably in recent years, yet we still lack a comprehensive overview of how altered snow conditions will affect these ecosystems. In specific, we found a mismatch in the timing of snowmelt when comparing studies of natural snow gradients with snow manipulations. We found that snowmelt timing achieved by manipulative studies (average 7.9 days advance, 5.5 days delay) were substantially lower than those observed over spatial gradients (mean range of 56 days) or due to interannual variation (mean range of 32 days). Differences between snow study approaches need to be accounted for when projecting snow dynamics and their impact on ecosystems in future climates. Sat, 01 Jan 2022 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/14106 2022-01-01T00:00:00Z