CO2 concentration and flux near ground in marsh of the Sanjiang plain of Northeast China |
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Authors: | Minhua Yan Xuehui Ma Xianguo Lu |
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Institution: | (1) Changchun Institute of Geography, the Chinese Academy of Sciences, 130021 Changchun, P. R. China |
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Abstract: | There is limited information available on CO2 concentration and flux over marsh. The objective of this work was to characterize CO2 concentration and flux within and above marsh plant (Carex lasiocarpa Ehrh. and C. pseudocuraica F. Schm) canopy at heights 0.5, 1.0 and 1.5 m. CO2 concentration was measured sequentially every 3 hours by using an infrared gas analyzer. Soil and air temperature, wind speed,
net radiation and soil heat flux were also measured simultaneously. Extremely daily minimum and maximum CO2 concentration ranged from 250 to 754 μmd/mol for the 4-year work. The typical minimum and maximum values ranged from 314
to 464 μmol/mol at the height of marsh plant (about 0.5 m) during the fruiting period and mature date. The seasonal changes
in CO2 concentration show that the minimum CO2 concentration occurred in the fruiting period and mature date, and both of their minimum values were 314 μmol/mol. This illustrates
that CO2 consumed by photosynthesis was stable during the period. The flux of CO2 can be thought as a turbulent diffusion phenomenon. By micrometeorological methods, the diurnal CO2 fluxes were measured in the flowering period, fruiting period, early mature date, late mature date and yellow-ripe stage.
Their values were −0.18, 38.15,24.13,10.9 and 4.91 μmol/mol respectively. |
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Keywords: | CO2 concentration gradient of CO2 concentration CO2 flux marsh the Sanjiang Plain |
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