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Article

Quantification of Ecosystem-Scale Methane Sinks Observed in a Tropical Rainforest in Hainan, China

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Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Xianyang 712100, China
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Faculty of Architecture and Urban Planning, Chongqing University, Chongqing 400045, China
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Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
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College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
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School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
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Jianfengling National Key Field Observation and Research Station for Forest Ecosystem, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, China
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Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, C.P. 8888, Succ. Centre-Ville, Montreal, QC H3C 3P8, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Cheikh Mbow
Land 2022, 11(2), 154; https://doi.org/10.3390/land11020154
Received: 28 November 2021 / Revised: 13 January 2022 / Accepted: 15 January 2022 / Published: 19 January 2022
Tropical rainforest ecosystems are important when considering the global methane (CH4) budget and in climate change mitigation. However, there is a lack of direct and year-round observations of ecosystem-scale CH4 fluxes from tropical rainforest ecosystems. In this study, we examined the temporal variations in CH4 flux at the ecosystem scale and its annual budget and environmental controlling factors in a tropical rainforest of Hainan Island, China, using 3 years of continuous eddy covariance measurements from 2016 to 2018. Our results show that CH4 uptake generally occurred in this tropical rainforest, where strong CH4 uptake occurred in the daytime, and a weak CH4 uptake occurred at night with a mean daily CH4 flux of −4.5 nmol m−2 s−1. In this rainforest, the mean annual budget of CH4 for the 3 years was −1260 mg CH4 m−2 year−1. Furthermore, the daily averaged CH4 flux was not distinctly different between the dry season and wet season. Sixty-nine percent of the total variance in the daily CH4 flux could be explained by the artificial neural network (ANN) model, with a combination of air temperature (Tair), latent heat flux (LE), soil volumetric water content (VWC), atmospheric pressure (Pa), and soil temperature at −10 cm (Tsoil), although the linear correlation between the daily CH4 flux and any of these individual variables was relatively low. This indicates that CH4 uptake in tropical rainforests is controlled by multiple environmental factors and that their relationships are nonlinear. Our findings also suggest that tropical rainforests in China acted as a CH4 sink during 2016–2018, helping to counteract global warming. View Full-Text
Keywords: CH4 flux; tropical rainforest; eddy covariance; annual budget; soil moisture; soil temperature CH4 flux; tropical rainforest; eddy covariance; annual budget; soil moisture; soil temperature
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MDPI and ACS Style

Liu, Z.; Li, H.; Wu, F.; Wang, H.; Chen, H.; Zhu, Q.; Yang, G.; Liu, W.; Chen, D.; Li, Y.; Peng, C. Quantification of Ecosystem-Scale Methane Sinks Observed in a Tropical Rainforest in Hainan, China. Land 2022, 11, 154. https://doi.org/10.3390/land11020154

AMA Style

Liu Z, Li H, Wu F, Wang H, Chen H, Zhu Q, Yang G, Liu W, Chen D, Li Y, Peng C. Quantification of Ecosystem-Scale Methane Sinks Observed in a Tropical Rainforest in Hainan, China. Land. 2022; 11(2):154. https://doi.org/10.3390/land11020154

Chicago/Turabian Style

Liu, Zhihao, Hong Li, Fangtao Wu, Hui Wang, Huai Chen, Qiuan Zhu, Gang Yang, Weiguo Liu, Dexiang Chen, Yide Li, and Changhui Peng. 2022. "Quantification of Ecosystem-Scale Methane Sinks Observed in a Tropical Rainforest in Hainan, China" Land 11, no. 2: 154. https://doi.org/10.3390/land11020154

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