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Ammonia Emission from a Young Larch Ecosystem Afforested after Clear-Cutting of a Pristine Forest in Northernmost Japan |
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| Authors: | Kentaro Hayashi Kentaro Takagi Izumi Noguchi Karibu Fukuzawa Hiroyuki Takahashi Tatsuya Fukazawa Hideaki Shibata Yasumi Fujinuma |
| Institution: | 1. Carbon and Nutrient Cycles Division, National Institute for Agro-Environmental Sciences, 305-8604, Tsukuba, Ibaraki, Japan 2. Teshio Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University, 098-2943, Horonobe, Hokkaido, Japan 3. Environmental Chemistry Section, Hokkaido Institute of Environmental Sciences, 060-0819, Sapporo, Hokkaido, Japan 4. Field Science Education and Research Center, Kyoto University, 606-8502, Kitashirakawa, Kyoto, Japan 5. Graduate School of Engineering, Hokkaido University, 060-8628, Sapporo, Hokkaido, Japan 6. Northern Forestry Research and Development Office, Field Science Center for Northern Biosphere, Hokkaido University, 096-0071, Nayoro, Hokkaido, Japan 7. Department of Environmental Management, Tottori University of Environmental Studies, 689-1111, Tottori, Tottori, Japan |
| Abstract: | The present study aimed to elucidate the atmosphere–forest exchange of ammoniacal nitrogen (NHX-N) at a young larch ecosystem. NHX-N exchanges were measured at a remote site in northernmost Japan where 4-year-old larches were growing after a pristine forest had been clear-cut and subsequent dense dwarf bamboo (Sasa) had been strip-cut. The site was a clean area for atmospheric ammonia with mean concentrations of 0.38 and 0.11 μg N m?3 in snowless and snow seasons, respectively. However, there was a general net emission of NHX-N. The annual estimated emission of NHX-N of 4.8 kg N ha?1 year?1 exceeded the annual wet deposition of 2.4 kg N ha?1 year?1, but the weekly exchange fluxes may have been underestimated by 28–60%. The main cause of the ammonia loss from the young larch ecosystem was probably enhanced nitrogen supply stimulated by the cutting of the pristine forest and Sasa, in particular, the Sasa. |
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