Longer growing seasons do not increase net carbon uptake in Northeastern Siberian tundra
| Autor: | Sergei Karsanaev, Alexander V. Kononov, Frans-Jan W. Parmentier, A. J. Dolman, Trofim C. Maximov, D. A. Suzdalov, J. van Huissteden, M. K. van der Molen |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
0106 biological sciences
Meteorologie en Luchtkwaliteit Atmospheric Science 010504 meteorology & atmospheric sciences Meteorology and Air Quality Eddy covariance Soil Science Growing season Aquatic Science Oceanography Graminoid 01 natural sciences Carbon cycle dioxide Geochemistry and Petrology vegetation Earth and Planetary Sciences (miscellaneous) eddy covariance Ecosystem arctic tundra 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology WIMEK Ecology cycle 010604 marine biology & hydrobiology Paleontology Primary production co2 exchange Forestry 15. Life on land ecosystem exchange Tundra flux Geophysics Agronomy 13. Climate action Space and Planetary Science Climatology climate-change Environmental science Ecosystem respiration respiration |
| Zdroj: | Journal of Geophysical Research: Biogeosciences, 116 Journal of Geophysical Research Journal of Geophysical Research: Biogeosciences 116 (2011) |
| ISSN: | 2169-8953 |
| DOI: | 10.1029/2011jg001653 |
| Popis: | With global warming, snowmelt is occurring earlier and growing seasons are becoming longer around the Arctic. It has been suggested that this would lead to more uptake of carbon due to a lengthening of the period in which plants photosynthesize. To investigate this suggestion, 8 consecutive years of eddy covariance measurements at a northeastern Siberian graminoid tundra site were investigated for patterns in net ecosystem exchange, gross primary production (GPP) and ecosystem respiration (R-eco). While GPP showed no clear increase with longer growing seasons, it was significantly increased in warmer summers. Due to these warmer temperatures however, the increase in uptake was mostly offset by an increase in R-eco. Therefore, overall variability in net carbon uptake was low, and no relationship with growing season length was found. Furthermore, the highest net uptake of carbon occurred with the shortest and the coldest growing season. Low uptake of carbon mostly occurred with longer or warmer growing seasons. We thus conclude that the net carbon uptake of this ecosystem is more likely to decrease rather than to increase under a warmer climate. These results contradict previous research that has showed more net carbon uptake with longer growing seasons. We hypothesize that this difference is due to site-specific differences, such as climate type and soil, and that changes in the carbon cycle with longer growing seasons will not be uniform around the Arctic. (Less) |
| Databáze: | OpenAIRE |
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