Nitrous oxide emissions from three ecosystems in tropical peatland of Sarawak, Malaysia(Environment)

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Nitrous oxide (N_2O) emissions were measured monthly over 1 year in three ecosystems on tropical peatland of Sarawak, Malaysia, using a closed-chamber technique. The three ecosystems investigated were mixed peat swamp forest, sago (Metroxylon sagu) and oil palm (Elaeis guineensis) plantations. The highest annual N_2O emissions were observed in the sago ecosystem with a production rate of 3.3kg N ha^<-1> year^<-1>, followed by the oil palm ecosystem at 1.2kg N ha^<-1> year^<-1> and the forest ecosystem at 0.7kg N ha^<-1> year^<-1>. The N_2O emissions ranged from -3.4 to 19.7μg N m^<-2> h^<-1> for the forest ecosystem, from 1.0 to 176.3μg N m^<-2> h^<-1> for the sago ecosystem and from 0.9 to 58.4μg N m^<-2> h^<-1> for the oil palm ecosystem. Multiple regression analysis showed that N_2O production in each ecosystem was regulated by different variables. The key factors influencing N_2O emissions in the forest ecosystem were the water table and the NH^+_4 concentration at 25-50cm, soil temperature at 5cm and nitrate concentration at 0-25cm in the sago ecosystem, and water-filled pore space, soil temperature at 5cm and NH^+_4concentrations at 0-25cm in the oil palm ecosystem. R^2 values for the above regression equations were 0.57, 0.63 and 0.48 for forest, sago and oil palm, respectively. The results suggest that the conversion of tropical peat swamp forest to agricultural crops, which causes substantial changes to the environment and soil properties, will significantly affect the exchange of N_2O between the tropical peatland and the atmosphere. Thus, the estimation of net N_2O production from tropical peatland for the global N_2O budget should take into consideration ecosystem type.
社団法人日本土壌肥料学会の論文

Nitrous oxide emissions from three ecosystems in tropical peatland of Sarawak, Malaysia(Environment)

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