Soil carbon management index under different land use
DOI:
https://doi.org/10.5564/mjgg.v62i46.4102Keywords:
Soil organic carbon, Permanganate oxidizable organic carbon, Carbon management indexAbstract
This study evaluates the Carbon Management Index (CMI) across various land uses: settlement, pasture, forest, wheat cropland, abandoned cropland, and potato cropland in Jargalant soum, Central province, Mongolia. We assessed soil quality and carbon dynamics using permanganate oxidizable carbon (POXC) as an indicator of labile carbon. Soil samples from 0–15 cm and 15–30 cm depths revealed POXC ranging from 0.36 to 1.68 g kg⁻¹, highest in forest soils and lowest in abandoned cropland. The results of the study showed that at the 0-15 cm depth, CMI varied from 22.3 (settlement) and 28.4 (abandoned cropland) to 60.6 (wheat cropland), 60.9 (potato cropland), and 76 (pasture), indicating degradation in settlement and abandoned soils and rehabilitation in pasture and croplands soil. 15-30 cm depth, CMI varied from 67 (settlement) and 78 (abandoned cropland) to 131 (wheat cropland), 138 (pasture), and 198 (potato cropland), indicating degradation in settlement and abandoned soils and rehabilitation in pasture and cropland soils. POXC strongly correlated with soil organic carbon (SOC; r = 0.908, 0.841). These findings highlight POXC and CMI as sensitive tools for monitoring soil health and informing sustainable land management practices.
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