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在遥感和地理信息系统(GIS)技术的支持下,以商洛地区1978年多波段扫描仪(MSS)和1990、2000、2006年专题制图仪(TM)四期遥感影像为基础,利用ERDAS软件的监督分类与GIS的空间分析功能,提取了商洛地区各类型林地的动态变化信息,研究分析了近30年来商洛地区各种类型林地的时空变化特征.结果表明:林地的总面积由12584.55km2增加到14479.44km2;针叶林、灌丛面积增加,而针阔混交林、阔叶林的面积减少,低海拔地区较高海拔地区变化剧烈.林地破碎化程度严重,且内部结构发生了根本性的变化,大多数阔叶林被灌丛取代.区域社会经济财力、农民收入及适耕地的多少是林地类型变化的主要驱动力.
Based on remote sensing and GIS technology, based on the 1978 multi-band scanner (MSS) and the four-phase remote sensing images of 1990, 2000 and 2006 (TM) in Shangluo region, using ERDAS software Supervised classification and the spatial analysis function of GIS, extracted the dynamic change information of various types of forest land in Shangluo area, analyzed the spatial and temporal variation characteristics of various types of forest land in Shangluo area in recent 30 years.The results showed that the total area of forest land increased from 12584.55km2 to 14479.44km2. The area of coniferous forest and shrub increased, but the areas of coniferous and broad-leaved mixed forest and broad-leaved forest decreased, and the altitude of low altitude changed dramatically.The elevation of fragmented woodland was serious and the internal structure changed fundamentally , Most of the broad-leaved forests are replaced by shrubs, and the main driving forces for changes in woodland types are the socio-economic and financial resources, farmer’s income and the amount of arable land in the region.