[A-CG47] [EJ] 陸域生態系の物質循環

[ACG47-P02] マレーシアサラワク州の熱帯泥炭林における土壌CO₂およびCH₄フラックス観測

*平田 竜一¹、石倉 究²、平野 高司²、Kiew Frankie²、Xhuan Wong²、Melling Lulie³ (1.国立環境研究所、2.北海道大学、3.熱帯泥炭研究所)

Large carbon has been stored in organic soil in tropical peat swamp forests, which has various types. We measured soil CO₂ and CH₄ fluxes two tropical peat swamp forests using automated multi chamber system, which consists of 16 chambers. Difference of two tropical peat swamp forests is depth of ground water level (GWL). GWL in CMC site is lower and that in MLM site is higher.
Both CO₂ and CH₄ fluxes were strongly regulated by GWL. CO₂ flux in both sites increased with decreasing GWL. However, CO₂ fluxes in CMC site became plateau below -0.3 m of GWL.
On the contrast, CH₄ in both sites decreased with decreasing GWL. In CMC site, CH₄ is almost zero below -0.3 m of GWL.