A seasonal behavior of surface soil moisture condition in a reclaimed tropical peatland

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Soil moisture condition is essential to regulate the release of soil carbon from a drained peatland since aerobic microbial activities can be encouraged through oxygen supply associated with dewatering the soil layer while they may be discouraged under too dry conditions. Aiming to characterize the soil moisture condition in a reclaimed tropical peatland, we monitored the volumetric water content at 5 cm depth (θ 5 cm), groundwater level (GWL) and rainfall for 20 months from March 2010 to November 2011 in an oil palm field in Nakhon-Si-Thammarat, Thailand. We also measured the soil water retention curve and the unsaturated hydraulic conductivity (k) for a series of matric potential (h) to simulate the moisture condition monitored in the field by using the Buckingham-Darcy's flux law. During the dry season in 2010, the θ 5 cm consistently stayed lower than 0.35 m3 m–3 with the GWL lower than a depth of 30 cm. In the transition from the dry season to the rainy season in 2010, the GWL rose to the land surfac...

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