Methane emission from leaves of larch [Larix leptolepis], birch [Betura maximowicziana] and oak [Quercus monglica] saplings grown at elevated CO2 concentration in northern Japan: Preliminary study
2007
Kitaoka, S.(Forestry and Forest Products Research Inst., Sapporo (Japan). Hokkaido Research Center) | Sakata, T. | Koike, T. | Tobita, H. | Uemura, A. | Kitao, M. | Maruyama, Y. | Sasa, K. | Utsugi, H.
A recent study by Keppler et al. (2006: Nature 439, 187-191) reported methane emission from leaves under aerobic conditions, and suggested that forests are major methane sources. It is therefore important to determine the contribution of temperate forest to worldwide methane gas evolution. We studied methane emission from typical tree species native to northern Japan grown under both ambient and high CO2 concentrations ([CO2]), and accordingly consider methane emission rates on the global scale. We used three tree species: larch (Larix kaempferi (Lamb.) Carriere), birch (Betula maximowicziana Regel) and oak (Quercus mongolica Fisch. Ex Ledeb. var. crispula (Blume) Ohashi ). Fresh leaves were incubated at 35 deg C under illumination, and methane emission was monitored at 24 hr intervals. Methane emission was observed in leaves of all three species; specific patterns were found. Larch produced the most methane. Oak produced least methane at high CO2 concentration. There are currently large variations in estimates of the total methane emission on the global scale. The present results suggest that further accurate methane flux studies are necessary in order to determine total methane emission rates at the global scale.
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