河北小五台山国家级自然保护区土地覆被特征变化分析

Characteristic analysis of land cover change in nature reserve Xiaowutai mountain

基于中国土地覆被遥感分类系统,利用1990年、2000年、2010年和2020年4期遥感图像,分析小五台山自然保护区近30a来土地覆被类型,保护区各管理区的功能区转类指数变化特征。通过计算转类指数,定量衡量保护区各功能区的生态环境转好和转差趋势。结果表明:近30a来,保护区的土地覆被类型以乔木林地和草地为主,各个年份占保护区的面积都能达到95%以上。保护区1990~2000年涉及土地覆被类型变化的面积最大,合计6009.66hm^(2),但之后涉及土地覆被类型变化的面积急剧减少,表明在2000年以后保护区的土地覆被类型已基本稳定。保护区大部分区域的生态环境略有转好趋势,仅个别区域在某一时期会表现出转差趋势。各功能区不同时期的转类指数都很小,这种转好或转差的趋势不明显。

Based on remote sensing classification system of China land cover types,4 phases land sat remote sensing images which concerned 1990s,2000s,2010s and 2020s were used to analyze nature reserve land cover change in Xiaowutai mountain during the recent 30years.The land cover change index was used to measure the improvement degree of environment.The arbor forest and the grass land account for more than 95%of the protected area.The areas involved in the change of land cover typeadded up to 6009.66 hectares between 1990~2000s,which is the largest compared to other periods.However,the changed areas decreased sharply after 2000,which turn out the land cover type is basically stable in the nature reserve.The land cover change index show that the environment of this nature reserve was gradually getting better,but the trend was not obvious.