How do land use practices affect methane emissions from tropical peat ecosystems

摘要: Abstract Wetlands in Southeast Asia are thought to be one of the greatest sources methane (CH4) atmosphere. Tropical peatlands typical Asia, and store an enormous amount soil organic carbon. However, chamber studies CH4 flux have reported that emissions from tropical almost negligible. Recently, it was some tree species growing peat swamp forests emit considerable their stems. Thus, ecosystem-scale measurement is essential quantify balance ecosystems. In this 3-year study (February 2014 January 2017), using eddy covariance technique, we measured net ecosystem exchange (FCH4) above three different ecosystems Sarawak, Malaysia. The sites were undrained forest (UF), a relatively disturbed secondary (DF) oil palm plantation (OP). weekly mean FCH4 positively correlated groundwater level (GWL) UF DF. contrast, independent GWL OP, which lowered by drainage. monthly always positive, even drained OP. Mean annual (± 1 SD) 8.46 ± 0.51, 4.17 ± 0.69, 2.19 ± 0.21 g C m–2 year–1 UF, DF, respectively. inter-site differences explained significant positive exponential relationship (P