Effects of agricultural land-use change and forest fire on N_2O emission from tropical peatlands, Central Kalimantan, Indonesia(Environment)

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• Nitrous oxide (N_2O) 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 N_2O 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 N_2O emissions were among the highest values reported from cultivated tropical, temperate and boreal organic soils. Mean annual N_2O 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 N_2O emissions did not differ significantly between forests in 2002-2003, but were significantly lower in burned forest in 2003-2004. Annual N_2O emission was significantly correlated between years. Regression analysis revealed that annual N_2O emissions in 2003-2004 were 1.9-fold the corresponding 2002-2003 value (annual precipitation of 2339 and 1994 mm, respectively). N_2O fluxes were higher during the rainy season than during the dry season at all sites except the regenerated forest. N_2O 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 NO_3-N concentration when WFPS exceeded this threshold. Thus, changes in soil moisture were important in controlling seasonal changes in N_2O emission. Our results suggest that changing land use from forestry to agriculture will increase N_2O production. The effect of forest fires on N_2O emission from these soils was not clear.

• 社団法人日本土壌肥料学会の論文

著者

• HASHIDOKO Yasuyuki

  Graduate School of Agriculture, Hokkaido University

• LIMIN Suwido

  Faculty of Agriculture, University of Palangka Raya

• MORISHITA TOMOAKI

  Graduate School of Natural Science and Technology, Kanazawa University

• DOHONG Salampak

  パランカラヤ大農

• Darung Untung

  UNPAR

• Dohong Salampak

  Faculty Of Agriculture University Of Palangka Raya

• Takakai Fumiaki

  北大院農

• Hatano Ryusuke

  北大院農

• Takakai Fumiaki

  Graduate School of Agriculture, Hokkaido University

• Hatano Ryusuke

  Graduate School of Agriculture, Hokkaido University

• Limin Suwido

  Fac. Of Agriculture Palangkaraya Univ.

• Hatano Ryusuke

  Soil Science Laboratory Graduate School Of Agriculture Hokkaido University

• Darung Untung

  Faculty Of Agriculture The University Of Palangkaraya

• Takakai Fumiaki

  Akita Prefectural Univ. Akita

• MORISHITA Tomoaki

  Forestry and Forest Products Research Institute

• Morishita Tomoaki

  Inst. Biological Problems Of Cryolithzone Russian Acad. Sci. Yakutsk Rus

• Morishita Tomoaki

  Graduate School Of Agriculture Hokkaido University:(present Address)forestry And Forest Products Res

• KURAMOCHI Kanta

  Graduate School of Agriculture, Hokkaido University

• Limin Suwido

  Faculty Of Agriculture Palangka Raya University

• Darung Untung

  Faculty Of Agriculture Palangka Raya University

• Hatano Ryusuke

  Graduate School Of Agriculture Hokkaido Univ.

• Hashidoko Yasuyuki

  Graduate School And Res. Fac. Of Agriculture Hokkaido Univ.

• Kuramochi Kanta

  北大 大学院

• Hatano Ryusuke

  北大 大学院

• Mizoguchi Takeo

  Forestry And Forest Products Res. Inst. Kyoto Jpn

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