Yasuyuki Hashidoko, Yanxia Nie and Sharon Y. L. Lau
Proceedings of the 15th International Peat Congress
Eubacterial nitrous oxide (N2O) emitters inhabiting (a) boreal peat in North Europe, (b) an Andisol corn farm in northern Japan, and (c) tropical peat in South East Asia were investigated. After isolation of active N2O emitters, their response to pH (range 3-8), supplemental sucrose, and 10% acetylene were compared. Active N2O emitting bacteria, Burkholderia phenazinium SF-E2 and Pseudomonas sp. SC-H2 isolated from Sphagnum fuscum and S. capillifolium respectively in degrading palsa mires, showed an optimum pH for N2O emissions around neutral rather than at acidic levels. B. phenazinium SF-E2 showed almost no response to supplemented sucrose. In contrast, Pseudomonas sp. SC-H2 clearly accelerated N2O emissions under supplementation with 0.02% sucrose.