内蒙古中西部防护林时空动态监测研究简

以内蒙古土默特左旗为研究区域，选取了1980年MSS、1990年TM、2000年ETM以及2007年ETM4期Landsat遥感数据作为数据源。在Erdas和ArcGIS系统的支持下，结合土默特左旗土地利用图（1：10万）及林地解译标志，通过目视解译提取该区林地信息并对土默特左旗近30年的有林地进行遥感动态监测和分析。结果表明：①研究区域土默特左旗林地面积呈逐年减少趋势，其中1980—1990年相对变化最为剧烈，减少了2．2个百分点。②研究区域土默特左旗的林地类型主要为针阔混交林和灌木林，针叶林、阔叶林、针阔混交林林地面积整体呈现减少趋势，灌木林的林地面积整体呈现增加趋势。最后总结了土默特左旗林地面积的变化既有自然因素的作用，又有人为活动的影响，其中该区气候干旱、多风沙及人们对林地的不合理的开发利用是其主要原因。

On Spatial-temporal Dynamic Monitoring of Protection Forest in Western Inner Mongolia

With Inner Mongolia Tumotezuoqi as study area, selecting Landsat for the 1980 MSS, 1990 TM ,2000 ETM and 2007 ETM remote sens- ing data as a data source, with the support of Erdas and ArcGIS systems, combined with land use maps （1：100 thousands） and woodland interpre- tation sign,the forest land information was extracted by visual interpretation,the remote sensing dynamic monitoring and analysis of forest land in Tumotezuqi in recent.30 years was conducted. The results showed that：① The forest area reduced year by year. Among them, 1980 to 1990,the most d/amatic changes in the relative decrease of 2.2%. ②The main types of forest land are mixed broad leaf - coniferforest, shrub forest. The ar- ea of coniferous forest ,broad leaf forest and mixed broad leaf - coniferforest are decreasing,while shrub area is increasing. Tumotezuoqi changes in forest area are caused by both the natural factors and human activities. The drought, more sand and unreasonable development and utilization of forest land are the main causes.