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Open AccessArticle

Atmospheric and Surface-Condition Effects on CO2 Exchange in the Liaohe Delta Wetland, China

College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China
Chinese Academy of Meteorological Sciences, China Meteorological Administration, 46 Zhongguancun South Street, Haidian District, Beijing 100081, China
Author to whom correspondence should be addressed.
Water 2017, 9(10), 806;
Received: 15 August 2017 / Revised: 11 September 2017 / Accepted: 16 October 2017 / Published: 20 October 2017
The eddy covariance method was used to study the CO2 budget of the Liaohe Delta reed wetland in northern China during 2012–2015. The changes in environmental factors (including meteorology, vegetation, hydrology, and soil) were analyzed simultaneously. The change in the trend of the CO2 concentration in the reed wetland was similar to global changes over the four years. The average annual CO2 accumulation was 2.037 kg·CO2·m−2, ranging from 1.472 to 2.297 kg·CO2·m−2. The seasonal characteristics of the CO2 exchange included high CO2 absorption in June and July, and high emissions in April and from September to October, with the highest emissions in July 2015. The average temperatures from 2013 to 2015 were higher than the 50-year average, largely due to increased temperatures in winter. Precipitation was below the 50-year average, mainly because of low precipitation in summer. The average wind speed was less than the 50-year average, and sunshine duration decreased each year. The CO2 exchange and environmental factors had a degree of correlation or consistency. The contribution of meteorology, vegetation, hydrology, and soil to the CO2 budget was analyzed using the partial least squares method. Water and soil temperature had a greater effect on the CO2 exchange variability. The regression equation of the CO2 budget was calculated using the significant contributing factors, including temperature, precipitation, relative humidity, water-table level, salinity, and biomass. The model fit explained more than 70% of the CO2 exchange, and the simulation results were robust. View Full-Text
Keywords: wetland; CO2 exchange; environmental factors; characteristics; attribute; prediction wetland; CO2 exchange; environmental factors; characteristics; attribute; prediction
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Jia, Q.; Yu, W.; Zhou, L.; Liang, C. Atmospheric and Surface-Condition Effects on CO2 Exchange in the Liaohe Delta Wetland, China. Water 2017, 9, 806.

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