VARIATIONS OF SOIL CHEMICAL PROPERTIES AT DIFFERENT HORIZONS UNDER NATURAL FOREST CANOPY IN KON KA KINH NATIONAL PARK, GIA LAI
Keywords:
Soil organic carbon, soil chemical properties, natural forest types, Kon Ka Kinh national parkAbstract
Forests contribute an important role in mitigating atmospheric CO2 because forest ecosystems are paramount elements of carbon cycle and carbon sequestration in soil, detritus and vegetation. The research which carried out in 14 plots with area of 2000m2 has compared and discussed the differences in soil organic carbon (SOC) distribution, some macronutrients and mobility Fe ion at different vertical soil horizons (0 - 10cm, 10 - 20cm, 20 - 30cm, 30 - 50cm) between old-growth and secondary forests in Kon Ka Kinh National Park. The results show that the content of all properties has a significant difference between the two forest types (Sig values of linear tmixed effect models < 0.05). Most of the indicators are significantly different between soil layers (Sig. < 0.05) while total phosphorus content is less changed and total potassium content increases with vertical soil depths. The principal component analysis diagram also indicates that the soil properties closely related, especially soil organic carbon, total nitrogen and total phosphorus.
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