Soil Organic Carbon in Typic Hapluderts on Different Slopes and Land Uses
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Abstract
Organic carbon is a key component in the carbon cycle and plays a crucial role in determining soil quality. This research aimed to determine the soil organic carbon content on different slopes and land uses in Candirejo Village, Semin District, Gunungkidul Regency. Soil samples were taken by creating soil mini-pits to collect two samples in ten locations based on soil color differences as well as from the plow layer at depths of 0-10 cm and 10-20 cm. A field work was conducted using a survey method on the Typic Hapluderts with varying slopes and land uses. Soil analysis were: organic carbon using the Walkley and Black method, soil texture using the pipette method, soil bulk density using the volumetric ring method, pH H2O using the potentiometric method, and soil color using the Munsell method. The results indicated that soil organic carbon levels varied across different slopes and land uses. Average organic carbon content on flat slopes was 1,64% (low), on gentle slopes it was 1,21% (low), while the land uses content from highest to lowest was in forests 2,19% (medium), in shrublands 1,55% (low), in settlements 1,31%, in dry lands 1,20% (low), and in paddy soils 0,86% (very low). Slope did not significantly influence soil organic carbon levels. However, land use significantly influences soil organic carbon levels, resulting in significant differences in soil organic carbon content. Soil color coordinate L* (lightness) is linearly negatively correlated with soil organic-C with a value of r = 0,641. Soil organic carbon showed a strong and significant relationship with soil color coordinate L* (lightness). Higher soil organic carbon content led to lower L* values, indicating darker soil color.
Keywords: Land use, organic carbon, slope, Typic Hapluderts
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