Effects of agricultural land-use change and forest fire on N₂O emission from tropical peatlands, Central Kalimantan, Indonesia   总被引：1，自引：0，他引：1  

Fumiaki TAKAKAI  Tomoaki MORISHITA  Yasuyuki HASHIDOKO  Untung DARUNG  Kanta KURAMOCHI  Salampak DOHONG  Suwido H. LIMIN  Ryusuke HATANO 《Soil Science and Plant Nutrition》2006,52(5):662-674

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Fungal N₂O production in an arable peat soil in Central Kalimantan, Indonesia     

Yosuke YANAI  Koki TOYOTA  Tomoaki MORISHITA  Fumiaki TAKAKAI  Ryusuke HATANO  Suwido H. LIMIN  Untung DARUNG  Salampak DOHONG 《Soil Science and Plant Nutrition》2007,53(6):806-811

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Nitrous oxide emission derived from soil organic matter decomposition from tropical agricultural peat soil in central Kalimantan,Indonesia     

Yo Toma  Fumiaki Takakai  Untung Darung  Kanta Kuramochi  Suwido H. Limin  Salampak Dohong 《Soil Science and Plant Nutrition》2013,59(3):436-451

Our previous research showed large amounts of nitrous oxide (N₂O) emission (>200?kg?N?ha^?1?year^?1) from agricultural peat soil. In this study, we investigated the factors influencing relatively large N₂O fluxes and the source of nitrogen (N) substrate for N₂O in a tropical peatland in central Kalimantan, Indonesia. Using a static chamber method, N₂O and carbon dioxide (CO₂) fluxes were measured in three conventionally cultivated croplands (conventional), an unplanted and unfertilized bare treatment (bare) in each cropland, and unfertilized grassland over a three-year period. Based on the difference in N₂O emission from two treatments, contribution of the N source for N₂O was calculated. Nitrous oxide concentrations at five depths (5–80?cm) were also measured for calculating net N₂O production in soil. Annual N fertilizer application rates in the croplands ranged from 472 to 1607?kg?N?ha^?1?year^?1. There were no significant differences in between N₂O fluxes in the two treatments at each site. Annual N₂O emission in conventional and bare treatments varied from 10.9 to 698 and 6.55 to 858?kg?N?ha^?1?year^?1, respectively. However, there was also no significant difference between annual N₂O emissions in the two treatments at each site. This suggests most of the emitted N₂O was derived from the decomposition of peat. There were significant positive correlations between N₂O and CO₂ fluxes in bare treatment in two croplands where N₂O flux was higher than at another cropland. Nitrous oxide concentration distribution in soil measured in the conventional treatment showed that N₂O was mainly produced in the surface soil down to 15?cm in the soil. The logarithmic value of the ratio of N₂O flux and nitrate concentration was positively correlated with water filled pore space (WEPS). These results suggest that large N₂O emission in agricultural tropical peatland was caused by denitrification with high decomposition of peat. In addition, N₂O was mainly produced by denitrification at high range of WFPS in surface soil.  相似文献