Tenhovirta Salla A M, Kohl Lukas, Koskinen Markku, Patama Marjo, Lintunen Anna, Zanetti Alessandro, Lilja Rauna, Pihlatie Mari
Department of Agricultural Sciences, Environmental Soil Science, University of Helsinki, PO Box 56, Helsinki, 00014, Finland.
Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, University of Helsinki, Helsinki, 00560, Finland.
New Phytol. 2022 Jul;235(1):66-77. doi: 10.1111/nph.18120. Epub 2022 Apr 12.
Plants are recognized as sources of aerobically produced methane (CH ), but the seasonality, environmental drivers and significance of CH emissions from the canopies of evergreen boreal trees remain poorly understood. We measured the CH fluxes from the shoots of Pinus sylvestris (Scots pine) and Picea abies (Norway spruce) saplings in a static, non-steady-state chamber setup to investigate if the shoots of boreal conifers are a source of CH during spring. We found that the shoots of Scots pine emitted CH and these emissions correlated with the photosynthetically active radiation. For Norway spruce, the evidence for CH emissions from the shoots was inconclusive. Our study shows that the canopies of evergreen boreal trees are a potential source of CH in the spring and that these emissions are driven by a temperature-by-light interaction effect of solar radiation either directly or indirectly through its effects on tree physiological processes.
植物被认为是需氧产生甲烷（CH₄）的来源，但关于北方常绿树木冠层CH₄排放的季节性、环境驱动因素及其重要性仍知之甚少。我们在静态、非稳态箱式装置中测量了樟子松（苏格兰松）和欧洲云杉（挪威云杉）幼树嫩枝的CH₄通量，以研究北方针叶树嫩枝在春季是否为CH₄的来源。我们发现，樟子松嫩枝排放CH₄，且这些排放与光合有效辐射相关。对于欧洲云杉，嫩枝排放CH₄的证据尚无定论。我们的研究表明，北方常绿树木的冠层在春季是CH₄的潜在来源，并且这些排放是由太阳辐射的温度与光照相互作用效应直接或间接通过其对树木生理过程的影响驱动的。
