Aboveground plant biomass, carbon, and nitrogen dynamics before and after burning in a seminatural grassland of Miscanthus sinensis in Kumamoto, Japan
Aboveground plant biomass, carbon, and nitrogen dynamics before and after burning in a seminatural grassland of Miscanthus sinensis in Kumamoto, Japan
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DOI：
10.1111/j.1757-1707.2010.01039.x
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Yo Toma;F. G. Fernández;A. Nishiwaki;Toshihiko Yamada;G. Bollero;J. Stewart
中科院分区：
文献类型：
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作者：
Yo Toma;F. G. Fernández;A. Nishiwaki;Toshihiko Yamada;G. Bollero;J. Stewart
尽管日本使用火来维持芒草草原已有数千年的历史，但有关燃烧后这些生态系统中营养动态的信息却很少。我们调查了地上生物量的损失；碳 (C) 和氮 (N) 动力学；燃烧前后表层土壤C变化；日本熊本的中华芒草草原燃烧 2 小时后的二氧化碳 (CO2)、甲烷 (CH4) 和一氧化二氮 (N2O) 通量。我们计算了过去7300年土壤剖面内的平均C和N积累率，分别为58.0 kg C ha−1 yr−1 和2.60 kg N ha−1 yr−1 。燃烧后，98%的地上生物量和枯枝落叶被消耗。然而，田野上剩余的碳量为 102 kg C ha−1。我们发现至少 43% 的 C 可能因分解而损失。然而，剩余的碳（含有灰分和木炭）似乎有助于土壤中碳的积累。燃烧前后0~5cm表层土壤C含量无差异。土壤表面残留的枯枝落叶量表明，燃烧似乎并未导致土壤碳含量减少，也没有对中华木的地下营养树冠产生负面影响。此外，近 50 kg N ha−1 地上总生物量和凋落物氮因燃烧而损失。与燃烧事件之前相比，燃烧后土壤中的 CO2 和 CH4 通量似乎没有受到燃烧的直接影响。然而，燃烧后 N2O 通量测量的短时间跨度似乎足以表征燃烧后 N2O 通量立即增加的模式。这些发现表明，相对于燃烧事件之前，燃烧并没有导致土壤碳的显着减少，也没有导致土壤中二氧化碳和甲烷排放量的增加。
Although fire has been used for several thousand years to maintain Miscanthus sinensis grasslands in Japan, there is little information about the nutrient dynamics in these ecosystems immediately after burning. We investigated the loss of aboveground biomass; carbon (C) and nitrogen (N) dynamics; surface soil C change before and after burning; and carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes 2 h after burning in a M. sinensis grassland in Kumamoto, Japan. We calculated average C and N accumulation rates within the soil profile over the past 7300 years, which were 58.0 kg C ha−1 yr−1 and 2.60 kg N ha−1 yr−1, respectively. After burning, 98% of aboveground biomass and litter were consumed. Carbon remaining on the field, however, was 102 kg C ha−1. We found at least 43% of C was possibly lost due to decomposition. However, remaining C, which contained ash and charcoal, appeared to contribute to C accumulation in soil. There was no difference in the amount of 0–5 cm surface soil C before and after burning. The amount of remaining litter on the soil surface indicated burning appeared not to have caused a reduction in soil C nor did it negatively impact the sub‐surface vegetative crown of M. sinensis. Also, nearly 50 kg N ha−1 of total aboveground biomass and litter N was lost due to burning. Compared with before the burning event, postburning CO2 and CH4 fluxes from soil appeared not to be directly affected by burning. However, it appears the short time span of measurements of N2O flux after burning sufficiently characterized the pattern of increasing N2O fluxes immediately after burning. These findings indicate burning did not cause significant reductions in soil C nor did it result in elevated CO2 and CH4 emissions from the soil relative to before the burning event.