赛罕乌拉国家级自然保护区植被覆盖度时空变化分析

Analysis of Temporal and Spatial Variation of Fractional Vegetation Coverage in Saihanwula National Nature Reserve

为了揭示赛罕乌拉国家级自然保护区的植被变化规律。基于Landsat归一化植被指数(NDVI)遥感数据,利用像元二分模型对赛罕乌拉国家级自然保护区植被覆盖度进行估算,研究2002—2013年植被覆盖度的时空变化格局。研究结果表明:2002—2013年赛罕乌拉国家级自然保护区植被覆盖度状况良好、总体情况稳定,多年平均植被覆盖度为88%,植被覆盖度类型以高植被覆盖度为主,其次是中植被覆盖度;在2002—2008年和2008—2013年两个时期,赛罕乌拉国家级自然保护区植被覆盖度呈现出由低到高的转移趋势,植被状况变好;赛罕乌拉国家级自然保护区的植被覆盖度与气候变化有一定的相关性,但政策等人为因素是影响植被变化的主要因素。

In order to reveal the vegetation change rules of Saihanula national nature reserve,it based on Landsat normalized differente vegetation index remote sensing data.The fractional vegetation coverage of Saihanwula national nature reserve was estimated by using pixel dichotomous model.It studied that the temporal and spatial variation pattern of fractional vegetation coverage from 2002 to 2013.The results show that:from 2002 to 2013,the vegetation coverage of Saihanwula national nature reserve is in good condition and the overall situation is stable,with an average annual vegetation coverage of 88%.The types of vegetation coverage are mainly high fractional vegetation coverage,followed by middle fractional vegetation coverage.In 2002—2008 and 2008—2013,the vegetation coverage of Saihanwula national nature reserve shows a trend of shifting from low to high,and the vegetation condition becomes better.There is a certain correlation between vegetation coverage and climate change in Saihanula national nature reserve,however,human factors such as policy are the main factors affecting vegetation.