IMPACT OF DIFFERENT LAND USE SYSTEMS ON CARBON POOLS AND CARBON MINERALIZATION
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Date
2023-03-27
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University of Agricultural Sciences, Bangalore
Abstract
Land use changes exert a tenacious impact on carbon pools and carbon mineralization. Hence, the study was conducted to assess the impact of different land use systems, viz., forest land use systems [natural forest (Mixed), teak land use system], horticulture land use systems (mango land use system, guava land use system), agri-horti land use systems (custard apple land use system, amla land use system), agriculture land use system [finger millet–chemical fertilizer based cropping system (FM-CF), finger millet–organic manure based cropping system (FM-OM), finger millet– integrated nutrient management based cropping system (FM-INM)] and agroforestry land use system (Melia dubia land use system) on carbon pools and carbon mineralization at University of Agricultural Sciences, GKVK, Bengaluru. The natural forest has highest mean soil organic carbon content. Whereas, the primary nutrients content was significantly higher in FM-INM cropping system. The natural forest recorded significantly higher mean very labile carbon (VLC), labile carbon (LC), less labile carbon (LLC), non-labile carbon (NLC), total carbon, microbial biomass carbon in the sand, silt and clay fractions compared to other land use systems. The conversion of natural forest into different land use systems resulted in the increase of active carbon (AC) pool per cent in the following order: teak land use system < Melia dubia land use system < mango land use system < guava land use system < amla land use system < custard apple land use system < FMINM cropping system < FM-OM cropping system < FM-CF cropping system. The amount of litter fall was highest in mango land use system but decay rate was highest in Melia dubia land use system. Percent carbon mineralization was the maximum under the FM-CF cropping system. Thenatural forest recorded higher soil quality index compared to other land use systems.