Ecosystem carbon (CO2 and CH4) fluxes of a Populus dettoides plantation in subtropical China during and post clear-cutting
作者： Shenghua Gao , Jiquan Chen , Yuxi Tang , Jing Xie , Rui Zhang
DOI: 10.1016/J.FORECO.2015.08.026
关键词: Ecology 、 Environmental science 、 Eddy covariance 、 Clearcutting 、 Growing season 、 Sink (geography) 、 Agronomy 、 Ecosystem 、 Carbon sequestration 、 Floodplain 、 Carbon sink
摘要: Poplar plantations have widely spread around the world due to its high productivity and adaptability. Clear-cutting is primary harvesting method for poplar plantation management in southern China. However, effect of on ecosystem carbon fluxes limits our ability estimate sequestration. A consecutive, three-year observation CO2 CH4 flux (F-CO2 F-CH4) a Populus dettoides floodplain Yangtze River was made prior post clear-cutting using an eddy-covariance system. We found that turned from strong sink mediate source only several months, July next January, after harvest. The net at beginning first growing season following large understory vegetation this region. annual budget -424.3 +/- 52.5 g-C m(-2) (95% confidence interval) year, with -53.6 22.8 year -290.7 34.2 second clear-cutting. third month, but during three years emission balanced out very small portion (0.3%) F-CO2. In non-inundation periods, F-CH4 varied -0.01 0.24 mmol d(-1), mean (SD) 0.11 0.08 while it ranged 0.33 4.39 d(-1) inundation, (+/- SD) 2.17 1.16 d(-1). Daily weekly period were highly correlated ground water table, soil moisture, friction velocity, inundation depended depth. (C) 2015 Elsevier B.V. All rights reserved.
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