Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest
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ORIGINAL PAPER
Bryophytes impact the fluxes of soil non-carbon dioxide greenhouse gases in a subalpine coniferous forest Andi Li 1,2,3,4 & Thomas H. DeLuca 5 & Shouqin Sun 1,2
&
Jun Zhang 1,2,3 & Genxu Wang 1,2
Received: 15 October 2019 / Revised: 6 June 2020 / Accepted: 10 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Terrestrial bryophytes substantially regulate ecosystem processes in high latitude and high elevation ecosystems; however, the role of these plants in mediating soil emissions of non-CO2 greenhouse gases (GHGs) (N2O and CH4) in these ecosystems remains poorly understood. A removal experiment was conducted to investigate the influence of bryophytes on soil non-CO2 GHGs emission in a subalpine coniferous forest on the eastern edge of the Tibetan Plateau. Bryophyte removal decreased the average N2O emission rate, but did not significantly alter the CH4 flux rate. The cumulative amount of N2O emission and CH4 uptake was decreased by bryophyte removal. Compared to bryophyte-removal plots, soil in the control plots had higher concentrations of soil organic C (SOC), total N (TN), dissolved organic C (DOC), dissolved N (DN), and exchangeable NH4+. The control plots also had higher cumulative N2O emission and CH4 uptake compared to plots with bryophytes removed. Bryophyteremoval significantly changed the relationship between soil non-CO2 GHGs flux rates and soil water content, induced a linear decreasing relationship between the N2O emission rate and soil water content and a quadratic relationship between CH4 flux rate and soil water content in the bryophyte-removal plots. Results from this study indicate that bryophytes may regulate non-GHG emissions from subalpine coniferous soils and demonstrate that in the presence of bryophytes, these soils may act as a greater N2O source and CH4 sink in southwestern China. Keywords Coniferous forest . Methane . Moss . Nitrous oxide . Soil carbon and nitrogen . Subalpine ecosystem
Introduction
* Shouqin Sun [email protected] * Genxu Wang [email protected] 1
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
2
Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, No. 9, Block 4, South Renmin Rd., Chengdu 610041, China
3
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
4
University of Chinese Academy of Sciences, Beijing 100039, China
5
WA Franke College of Forestry and Conservation, University of Montana, 32 Campus Drive, Missoula, MT 59812, USA
Bryophytes are known to mediate ecosystem processes in high latitude and high elevation coniferous forests (Lindo and Gonzalez 2010). Previous studies showed that bryophytes may increase soil organic C (SOC) accumulation and therefore promote soil CO2 emissi
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