Labile forms of organic carbon pool in sandy soil as affected by land use change from sugarcane to rubber tree plantations in Northeast Thailand
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Abstract
Soil organic carbon (SOC) play an important role on soil quality and act as indicator of land use change. The objective of this study aimed to investigate changes in labile organic carbon pool including soil microbial biomass carbon (MBC) and permanganate-oxidizable C (POXC), soil organic carbon stock (SOC stock), and relating to soil properties under land use change by conversion from sugarcane to rubber tree plantation at different ages. Four study plots were conducted including 1) sugarcane plantation 2) 4-5 years rubber tree plantation 3) 11-12 years rubber tree plantation and 4) 22-23 years rubber tree plantation. Soil was loamy sand with high sand (79-83.6%) and low clay (<9.34%) contents. The result of this study found that labile organic carbon pool both MBC and POXC in soil planted rubber tree had higher than sugarcane plantation, with the highest in 22-23 years rubber tree plantation. The result also found the POXC was increased by rubber tree age (11-23 years) which clearly significantly different for 2-3 times from sugarcane plantation. In addition, the SOC stock was increased by rubber tree age with the highest in 22-23 years rubber tree plantation (304.44 mg C ha1). Increasing of labile carbon, especially accumulated POXC and SOC, resulted in a decrease in soil bulk density. These findings reflected the labile organic carbon pool as POXC is a sensitive indicator which can be used for monitoring and evaluation on soil quality under land use change and soil management to develop suitable guidelines for soil management.
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