Identification and Characterization of Hotspots of Desertification in Southern Karnataka.
Naveen Kumar,v.,Natarajan,A.and Anil Kumar,T.S. Badrinath, UAS,GKVK,Bangalore-65, GKVK,Bangalore, Bangalore, India
Remote sensing was used as a tool to identify the hotspots representing the desertification problem in the southern karnataka.Interpretation of imagery pictures(1:50,000) regarding Southern karnataka was carried out by using toposheets.Three hotspots were identified in chitradurga,chikmagalur and chamarajanagar districts representing soil erosion,salinisation and deforestation problems respectively.In chikmagalur district two profiles are collected from teak plantation and evergreen forest for the appropriate comparisoin.In chitradurga district three profiles are collected from the areas representing slight erosion,moderate erosion and severe erosion. In Chamarajanagar district four profiles were collected representing salinity and sodicity problems . Organic carbon values are high when compared to the teak plantation. Due to the decomposition of fallen litter, twigs, resulted in good structure, in evergreen forest which ultimately resulted in decreasing bulk density values. In chitradurga district due to erosion problem bulk density values are high, organic carbon, N,P,K and micronutrient levels are low. In Chamarajanagar district, based on pH, EC, SAR,ESP, water stable aggregates the soils are classified as natraquerts.classification of soils revealed that out of nine profiles two profiles belongs to mollisols, two profiles belongs to alfisol, three profiles belongs to vertisols and two profiles belongs to inceptisols.