Effects of agricultural land-use change and forest fire on N2O emission from tropical peatlands, Central Kalimantan, Indonesia
Effects of agricultural land-use change and forest fire on N2O emission from tropical peatlands, Central Kalimantan, Indonesia
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DOI：
10.1111/j.1747-0765.2006.00084.x
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发表时间：
2006-10
影响因子：
2
通讯作者：
F. Takakai;T. Morishita;Y. Hashidoko;U. Darung;Kanta Kuramochi;S. Dohong;S. Limin;R. Hatano
中科院分区：
文献类型：
--
作者：
F. Takakai;T. Morishita;Y. Hashidoko;U. Darung;Kanta Kuramochi;S. Dohong;S. Limin;R. Hatano
摘要在印度尼西亚加里曼丹中部的一个草地、三个农田、一个天然林、一个火烧林和一个再生林中测定了热带泥炭地土壤的氧化亚氮（N2 O）通量。只有农田接受施肥（665-1278公斤氮公顷-1年-1）。2002-2003年农田的N2 O年平均排放量为21-131 kg N ha−1年−1，2003-2004年为52-259 kg N ha−1年−1，显著高于其他可比地点的排放量。农田N2 O排放量是热带、温带和北方有机土壤中最高的。年平均N2 O排放量为7.1（2002-2003年）和23（2003-2004）kg N ha−1 year−1，显著高于天然林、再生林和火烧林（2002-2003年分别为0.62、0.40和0.97千克氮/公顷/年，2003-2004年分别为4.4、4.0和1.5千克氮/公顷/年）。2002-2003年，森林之间的N2 O年排放量没有显著差异，但2003-2004年，被烧毁的森林中的N2 O年排放量显著降低。年N2 O排放量年间相关性显著。回归分析表明，2003-2004年的N2 O年排放量是2002-2003年相应值的1.9倍（年降水量分别为2 339毫米和1 994毫米）。N2 O通量在雨季高于旱季在所有网站，除了再生林。当土壤孔隙水饱和度（WFPS）小于60- 70%时，农田和草地的N2 O通量显著降低;当WFPS超过此值时，N2 O通量随土壤NO3-N浓度的增加而增加。因此，土壤水分的变化是重要的控制N2 O排放的季节变化。我们的研究结果表明，改变土地利用从林业到农业将增加N2 O的生产。森林火灾对这些土壤N2 O排放的影响尚不清楚。
Abstract Nitrous oxide (N2O) fluxes from tropical peatland soils were measured at a grassland, three croplands, a natural forest, a burned forest and a regenerated forest in Central Kalimantan, Indonesia. Only croplands received fertilization (665–1278 kg N ha−1 year−1). Mean annual N2O emissions from croplands were 21–131 kg N ha−1 year−1 in 2002–2003 and 52–259 kg N ha−1 year−1 in 2003–2004, and were significantly higher than the emissions from other comparable sites. Cropland N2O emissions were among the highest values reported from cultivated tropical, temperate and boreal organic soils. Mean annual N2O emissions were 7.1 (2002–2003) and 23 (2003–2004) kg N ha−1 year−1 from grassland, and were significantly higher than in natural, regenerated and burned forests (0.62, 0.40 and 0.97 kg N ha−1 year−1 in 2002–2003 and 4.4, 4.0 and 1.5 kg N ha−1 year−1 in 2003–2004, respectively). Annual N2O emissions did not differ significantly between forests in 2002–2003, but were significantly lower in burned forest in 2003–2004. Annual N2O emission was significantly correlated between years. Regression analysis revealed that annual N2O emissions in 2003–2004 were 1.9-fold the corresponding 2002–2003 value (annual precipitation of 2339 and 1994 mm, respectively). N2O fluxes were higher during the rainy season than during the dry season at all sites except the regenerated forest. N2O fluxes in cropland and grassland were significantly lower when the water-filled pore space (WFPS) was less than 60–70%, and increased with an increase in soil NO3–N concentration when WFPS exceeded this threshold. Thus, changes in soil moisture were important in controlling seasonal changes in N2O emission. Our results suggest that changing land use from forestry to agriculture will increase N2O production. The effect of forest fires on N2O emission from these soils was not clear.