Evaluation of greenhouse gas emissions in a Miscanthus sinensis Andersson-dominated semi-natural grassland in Kumamoto, Japan
Evaluation of greenhouse gas emissions in a Miscanthus sinensis Andersson-dominated semi-natural grassland in Kumamoto, Japan
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DOI：
10.1080/00380768.2015.1117944
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发表时间：
2016-01
影响因子：
2
通讯作者：
Yo Toma;Toshihiko Yamada;F. Fernández;A. Nishiwaki;R. Hatano;Ryan Stewart
中科院分区：
文献类型：
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作者：
Yo Toma;Toshihiko Yamada;F. Fernández;A. Nishiwaki;R. Hatano;Ryan Stewart
摘要 人类活动造成的温室气体排放量不断增加仍然是全世界面临的一个日益严重的问题。在半天然芒草中；我们在日本熊本阿苏的草原上进行了数千年的管理，测量了每年控制燃烧前后的土壤甲烷 (CH4) 和一氧化二氮 (N2O) 排放量。我们估算了 2009 年和 2010 年土壤年碳 (C) 积累量以及生物质燃烧引起的 CH4 和 N2O 排放量，以确定该生态系统及其管理对全球变暖的影响。影响土壤 CH4 和 N2O 通量的环境因素尚不清楚，没有观察到年度燃烧对短期土壤 CH4 和 N2O 排放的影响。然而，考虑到排放量（CH4：-4.33 kg C ha−1 yr−1，N2O：0.17 kg N ha−1 yr−1）相对低于其他土地利用类型中测量的排放量，燃烧过程中木炭的沉积可能会增强研究地点的 CH4 氧化和 N2O 消耗。尽管每年早春燃烧事件中CH4和N2O排放量很大，但中华木半天然草地每年土壤碳积累量较大，导致全球变暖潜力为-4.86 Mg CO2eq ha−1 yr−1。因此，我们的结果表明，通过每年焚烧来长期维持半天然中华草草地可以有助于缓解全球变暖。
ABSTRACT Increasing greenhouse gas emissions from anthropogenic activities continue to be a mounting problem worldwide. In the semi-natural Miscanthus sinensis Andersson; grasslands of Aso, Kumamoto, Japan, which have been managed for thousands of years, we measured soil methane (CH4) and nitrous oxide (N2O) emissions before and after annual controlled burns. We estimated annual soil carbon (C) accumulation, and CH4 and N2O emissions induced by biomass burning in 2009 and 2010, to determine the impacts of this ecosystem and its management on global warming. Environmental factors affecting soil CH4 and N2O fluxes were unknown, with no effect of annual burning observed on short-term soil CH4 and N2O emissions. However, deposition of charcoal during burning may have enhanced CH4 oxidation and N2O consumption at the study site, given that emissions (CH4: −4.33 kg C ha−1 yr−1, N2O: 0.17 kg N ha−1 yr−1) were relatively lower than those measured in other land-use types. Despite significant emission of CH4 and N2O during yearly burning events in early spring, the M. sinensis semi-natural grassland had a large annual soil C accumulation, which resulted in a global warming potential of −4.86 Mg CO2eq ha−1 yr−1. Consequently, our results indicate that long-term maintenance of semi-natural M. sinensis grasslands by annual burning can contribute to the mitigation of global warming.