环境科学
河岸带
涡度相关法
河岸林
温带雨林
生态系统
温带森林
天蓬
水槽(地理)
森林生态学
水文学(农业)
大气科学
生态学
栖息地
生物
地理
地质学
岩土工程
地图学
作者
Ülo Mander,Alisa Krasnova,Thomas Schindler,J. Patrick Megonigal,Jordi Escuer-Gatius,Mikk Espenberg,Kateřina Macháčová,Martin Maddison,Jaan Pärn,Reti Ranniku,Mari Pihlatie,Ülo Niinemets,Kaido Soosaar
标识
DOI:10.1016/j.scitotenv.2021.151723
摘要
The carbon (C) budgets of riparian forests are sensitive to climatic variability. Therefore, riparian forests are hot spots of C cycling in landscapes. Only a limited number of studies on continuous measurements of methane (CH4) fluxes from riparian forests is available. Here, we report continuous high-frequency soil and ecosystem (eddy-covariance; EC) measurements of CH4 fluxes with a quantum cascade laser absorption spectrometer for a 2.5-year period and measurements of CH4 fluxes from tree stems using manual chambers for a 1.5 year period from a temperate riparian Alnus incana forest. The results demonstrate that the riparian forest is a minor net annual sink of CH4 consuming 0.24 kg CH4-C ha-1 y-1. Soil water content is the most important determinant of soil, stem, and EC fluxes, followed by soil temperature. There were significant differences in CH4 fluxes between the wet and dry periods. During the wet period, 83% of CH4 was emitted from the tree stems while the ecosystem-level emission was equal to the sum of soil and stem emissions. During the dry period, CH4 was substantially consumed in the soil whereas stem emissions were very low. A significant difference between the EC fluxes and the sum of soil and stem fluxes during the dry period is most likely caused by emission from the canopy whereas at the ecosystem level the forest was a clear CH4 sink. Our results together with past measurements of CH4 fluxes in other riparian forests suggest that temperate riparian forests can be long-term CH4 sinks.
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