期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2006
卷号：XXXVI Part 4
出版社：Copernicus Publications
摘要：Drought is a common feature of this semi-arid district of Bellary, lying almost at the centre of the Indian peninsula. Under UNCCD's desertification monitoring and assessment theme, the district was taken on pilot basis for an assessment of desertification processes and to map the current desertification status in the district and make ameliorative recommendations. The degradation in the district was observed in agricultural lands (rainfed as well as irrigated), forest and scrub lands and by mining activities. About 2 % of the district area was under rocky, stony, sandy and other types of barren lands. The major processes recognized in agricultural lands were water erosion under rainfed conditions and salinization/alkalinization under irrigated conditions. In forest lands, logging for timber and fuel purposes and grazing and in scrub lands, cutting for fuel purpose and grazing were the major processes. About 28 % of the district was under these degradation processes, the vegetal processes being predominant in aerial extent. The water erosion was operative mainly in rainfed agricultural lands that too in black soils as red soils to some extent were protected by agricultural practices during the main rainy season. Water erosion was also observed in the reserve forest land facing vegetal degradation, but most of which was masked in the satellite data. The salinization/alkalinization processes on the other hand were prevalent mainly in irrigated black soils. However, differentiating saline lands from alkali lands was not possible from the satellite data. The measures for controlling these processes and to ameliorate the affected lands have been suggested
关键词：Land degradation; vegetal degradation; salt affected lands; water erosion; sand dunes; desertification
