Carbon budget characteristics of the broadleaved Korean pine forests in Changbaishan Mountains
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Graphical Abstract
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Abstract
Studies on CO2 exchange between vegetation and atmosphere can enhance the scientific understanding and modelling of carbon budget on terrestrial ecosystem.As a part of the ChinaFLUX program, CO2 flux was measured for year-round in 2003 by an open-path eddy covariance system over a broadleaved Korean pine forests in northeastern China.The net ecosystem carbon exchange(NEE) between forest and atmosphere ranged from(-6.37) to 2.13 g/(m2·d) during the observational year, with the net carbon assimilation peak occurred in June, and a highest net carbon efflux occurred in October.The nocturnal NEE showed an exponential regression relationship with 5 cm depth soil temperature, and the CO2 respiration Q10 of ecosystem was 3.17.With the increase of photosynthetic active radiation(PAR), CO2 flux changes were in well accordance with the curve of Michaelis-Menten model.The total NEE was -191.3 g/m2 in 2003, which indicated that the broadleaved Korean pine forests of Changbaishan Mountains were functioning as a moderate carbon sink.
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