梵净山长时序植被覆盖变化趋势与对比分析  

Variation trend and comparative analysis of long-term vegetation cover in Mount Fanjing

作　　者：余婷 杨萍 邓兴 刘绥华[1] 周洋 YU Ting;YANG Ping;DENG Xing;LIU Suihua;ZHOU Yang(School of Geography and Environmental Sciences,Guizhou Normal University,Guiyang 550000,China;Guizhou Surveying and Mapping Product Quality Supervision and Inspection Station,Guiyang 550000,China;Guiyang Surveying and Mapping Institute,Guiyang 550000,China;Qingdao Sizhou Heavy Equipment Co.,Ltd.,Qingdao 266000,China)

机构地区：[1]贵州师范大学地理与环境科学学院,贵州贵阳550000 [2]贵州省测绘产品质量监督检验站,贵州贵阳550000 [3]贵阳市测绘院,贵州贵阳550000 [4]青岛四洲重工设备有限公司,山东青岛266000

出　　处：《测绘通报》2023年第10期1-6,共6页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(61540072)。

摘　　要：梵净山具有独特的亚热带孤岛山岳生态系统和丰富的生物多样性,研究其植被覆盖长时序的时空演变和变化趋势,对于保护区的生态管理具有重要意义。本文基于GEE云平台,利用Landsat SR数据集进行去云和融合处理,使用最大值复合法合成年度NDVI数据集。通过像元二分模型法反演植被覆盖度,采用一元线性回归趋势分析法和Sen+Mann-Kendall趋势分析法对梵净山自然保护区的FVC进行逐像元的时空演变和趋势分析,并对比两种趋势分析的差异。结果表明:(1)近30年来,梵净山自然保护区的植被覆盖度呈先下降后上升的“U”形增长趋势,增长率为3.46%,植被覆盖情况得以明显改善。(2)在空间分布上,梵净山自然保护区的植被覆盖度呈现出中间高、四周低的特点。植被改善面积(占94.80%)远大于植被退化面积(占5.20%)。(3)两种趋势分析方法得出的梵净山自然保护区植被覆盖度变化趋势基本相似,但Sen+Mann-Kendall趋势分析法对显著变化结果的敏感程度高出2.18%。Mount Fanjing has a unique subtropical isolated island ecosystem and rich biodiversity.It is of great significance to study the long-term temporal and spatial evolution and change trends of its vegetation coverage for the ecological management of the reserve.Based on the GEE cloud platform,this paper uses the Landsat SR dataset for cloud removal and fusion processing,and uses the maximum composite method to synthesize the annual NDVI dataset.The vegetation coverage was inverted by the pixel dichotomy model,and the temporal and spatial evolution and trend of FVC in Fanjingshan National Nature Reserve were analyzed pixel by pixel by the linear regression trend analysis method and Sen+Mann-Kendall trend analysis method,and compared the difference between the two trend analyses.The results show that:(1)In the past 30 years,the vegetation coverage of Fanjingshan National Nature Reserve showed a “U”-shaped growth trend,which first decreased and then increased,with a growth rate of 3.46%,and the overall vegetation coverage improved significantly.(2)In terms of spatial distribution,the vegetation coverage of Fanjingshan National Nature Reserve is high in the middle and low in the surrounding areas.The area of vegetation improvement(accounting for 94.80%) is much larger than the area of vegetation degradation(accounting for 5.20%).(3)The change trends of vegetation coverage in Fanjingshan National Nature Reserve obtained by the two trend analysis methods are basically similar,but the Sen+Mann-Kendall trend analysis method is 2.18% more sensitive to significant changes.

关 键 词：Google Earth Engine 植被覆盖度 Sen+Mann-Kendall 一元线性回归 梵净山 

分 类 号：P23[天文地球—摄影测量与遥感]