农牧交错区草地面积动态变化研究——以内蒙古太仆寺旗为例

Research on dynamic change of grassland area in ecotone between agriculture and animal husbandry regions:A case study in Taipusi,Inner Mongolia

利用1986,2000和2009年3个年份点的遥感影像,在RS与GIS支持下,解译提取内蒙古太仆寺旗20余年草地空间信息,分析该区草地时空动态及其景观格局变化。结果表明:1986～2000年,草地面积减少307.67km2,且退化严重,大量草地转化为耕地,生态环境趋于恶化;2000～2009年,草地面积有所增加,增加的部分主要来自退耕地;20余年来,低地盐化草甸持续增加,低湿地草甸快速减少。基于分析结果,指出草地退化是自然因素与人类活动共同作用的结果,自然因素起到一定作用,人类活动干扰则是草地动态变化的主要驱动力。

By using three-period(1986,2000,2009) remote sensing images,with the support of RS and GIS,spatial information of grassland landscape in Taipusi from 1986 to 2009 is extracted,spatio-temporal dynamics of grassland and change of grassland landscape patterns are analyzed.The results showed that from 1986 to 2000,the areas of grassland decreased about 307.67 km2 and degraded seriously.Many grasslands are converted into cropland.The ecological environment has became deterioration.From 2000 to 2009,grassland areas have increased,the parts of the increase areas are mainly from cropland.In the past twenty years,the low salt meadow continued to increase,and the low land meadow decreased rapidly.Based on the analysis above,human activities and natural factors are the main factors that resulted in the degradation of the grassland.Natural factor takes some driving acting,but human actions are the dominating driving power.