Introduction The rectangular block of Proterozoic formation lying between north of the Singhbhum Mobile Belt(SMB,2.3-2.4 Ga,Saha 1994),Neogene sediments of the Bengal basin and the Quaternary-Recent alluvium of the Ganga
Background:Tropical forests have been experiencing remarkable rates of transformation over the past century as they are getting degraded or decimated to a great extent by anthropogenic activities.This study aims at in...Background:Tropical forests have been experiencing remarkable rates of transformation over the past century as they are getting degraded or decimated to a great extent by anthropogenic activities.This study aims at investigating the long-term forest cover transformation in Palamau Tiger Reserve(PTR),Jharkhand,India,using Landsat TM,ETM+,and OLI satellite images during 1975-2015.The forest cover was delineated utilizing various keys of visual interpretation techniques.Results:The forest cover was primarily decreased in the north-eastern and north-western parts in PTR.In order to identify the anthropogenic disturbance in the forest reserve,human settlement density was mapped using highresolution Google Earth imagery.The results showed a positive correlation between human population density and settlement density.Five major affected sites with an outer buffer of 2 km were demarcated in order to deduce the anthropogenic influences in major non-forested sites in PTR.It was observed that the forest change was maximum at site 3(Ranidah,area 61.06 km^(2),−6.47%change)followed by site 2(Saidup,area 124.38 km^(2),−7.65%change),where settlement units were also high(2638 and 2621 settlement units,respectively).At site 1(Barkheta,area 81.59 km^(2)),−1.99%change was observed,and at site 4(Samadh Tola,area 9.15 km^(2)),1.03% change was observed having moderate settlement units(2422 and 1892 settlement units,respectively).Areas with the low level of human settlements(1038 settlement units)observed the least change,i.e.,at site 5(Netarhat,area 48.52 km^(2)),0.58%change was observed mainly during the years.Conclusions:The forest cover exhibited an overall decrease of 14.55 km^(2)(−1.34%change)with episodic variation during 1975-2015 in PTR,Eastern India.A significant forest disturbance occurred primarily in the north-eastern and north-western parts of PTR along the forest fringe due to the high population and settlement density.The study highlighted the potential use of freely available multi-temporal satellite observations in forest management.展开更多
文摘Introduction The rectangular block of Proterozoic formation lying between north of the Singhbhum Mobile Belt(SMB,2.3-2.4 Ga,Saha 1994),Neogene sediments of the Bengal basin and the Quaternary-Recent alluvium of the Ganga
文摘Background:Tropical forests have been experiencing remarkable rates of transformation over the past century as they are getting degraded or decimated to a great extent by anthropogenic activities.This study aims at investigating the long-term forest cover transformation in Palamau Tiger Reserve(PTR),Jharkhand,India,using Landsat TM,ETM+,and OLI satellite images during 1975-2015.The forest cover was delineated utilizing various keys of visual interpretation techniques.Results:The forest cover was primarily decreased in the north-eastern and north-western parts in PTR.In order to identify the anthropogenic disturbance in the forest reserve,human settlement density was mapped using highresolution Google Earth imagery.The results showed a positive correlation between human population density and settlement density.Five major affected sites with an outer buffer of 2 km were demarcated in order to deduce the anthropogenic influences in major non-forested sites in PTR.It was observed that the forest change was maximum at site 3(Ranidah,area 61.06 km^(2),−6.47%change)followed by site 2(Saidup,area 124.38 km^(2),−7.65%change),where settlement units were also high(2638 and 2621 settlement units,respectively).At site 1(Barkheta,area 81.59 km^(2)),−1.99%change was observed,and at site 4(Samadh Tola,area 9.15 km^(2)),1.03% change was observed having moderate settlement units(2422 and 1892 settlement units,respectively).Areas with the low level of human settlements(1038 settlement units)observed the least change,i.e.,at site 5(Netarhat,area 48.52 km^(2)),0.58%change was observed mainly during the years.Conclusions:The forest cover exhibited an overall decrease of 14.55 km^(2)(−1.34%change)with episodic variation during 1975-2015 in PTR,Eastern India.A significant forest disturbance occurred primarily in the north-eastern and north-western parts of PTR along the forest fringe due to the high population and settlement density.The study highlighted the potential use of freely available multi-temporal satellite observations in forest management.
