基于GEE云平台的榆林市植被覆盖度时空变化研究  

Research on the temporal and spatial changes of vegetation coverage in Yulin based on GEE cloud platform

作　　者：白欣 贺炳彦[1] 高婷 李雪 孙乔 BAI Xin;HE Bing-yan;GAO Ting;LI Xue;SUN Qiao(School of Geological Engineering and Surveying and Mapping,Chang’an University,Xi’an 710000,China;Aerial Photogrammetry and Remote Sensing Group Co.,Ltd of Cnacg(Arsc),Xi’an 710000,China;Xi’an Lingtu Information Technology Co.,Ltd.,Xi’an 710000,China;Beijing Hangtian Reconnaissance Design Research Institute,Beijing 100162,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710000 [2]中煤航测遥感集团有限公司,西安710000 [3]西安灵图信息科技有限公司,西安710000 [4]航天建筑设计研究院有限公司,北京100162

出　　处：《湖北农业科学》2022年第16期70-75,120,共7页Hubei Agricultural Sciences

基　　金：陕西省自然科学基础研究计划项目(2021JQ-238)。

摘　　要：基于Google earth engine(GEE)平台,采用Landsat 5/7/8影像和像元二分模型分析2000—2019年榆林市植被覆盖度时空变化特征及其与地形因子、气候因子的相互关系,最后使用Hurst指数预测未来榆林市植被变化趋势。结果表明,2000—2019年榆林市植被覆盖度由西北向东南递增,中植被覆盖度面积占比最大;研究期内植被覆盖度共增长了11.2个百分点,年增长率为1.37%;植被覆盖得到改善的区域面积共占63.0%,退化的区域共占27.9%;地形和气候变化对植被的影响表现为植被覆盖度随高程增加呈先上升后下降的趋势,随坡度的增加呈上升趋势,降水对植被覆盖的影响较大,气温次之;Hurst指数均值为0.58,未来榆林市植被覆盖将以持续改善为主。研究显示榆林市自还林还草工程实施以来,整体植被覆盖情况得到改善,南部丘陵沟壑区的治理效果好于北部风沙区,在后退耕还林时代,研究人员应着重关注风沙区的防沙治沙、水土保持等生态建设工程。Based on the Google earth engine(GEE)platform,the Landsat 5/7/8 image and pixel binary model are used to analyze the spatiotemporal changes of vegetation coverage in Yulin from 2000 to 2019 and its relationship with topographical factors and climate factors.Finally,the Hurst index is used to forecast the vegetation change trend of Yulin in the future.The results showed that the vege⁃tation coverage of Yulin increased from northwest to southeast from 2000 to 2019,with the middle vegetation coverage area accounting for the largest proportion;during the study period,the vegetation coverage increased by 11.2%,and the growth rate was 1.37%;the area with improved vegetation coverage accounted for 63.0%,and the degraded area accounted for 27.9%.The influence of topography and climate change on vegetation is as follows:vegetation coverage first rises and then declines with the increase in elevation,and ris⁃es with the increase in slope.Precipitation has a greater impact on vegetation coverage,followed by temperature;the average Hurst in⁃dex is 0.58.In the future,the vegetation coverage of Yulin will be improved continuously.Research shows that since the implementa⁃tion of the project of returning forests and grasses in Yulin,the overall vegetation coverage has been improved.The control effect of the hilly and gully areas in the south is better than that of the sandy areas in the north.In the post-reforesting cultivated land era,research⁃ers should focus on ecological construction projects such as sand prevention and control as well as water and soil conservation in sand⁃storm areas.

关 键 词：植被覆盖度 Google earth engine 时空变化 榆林市 

分 类 号：X87[环境科学与工程—环境工程] Q948[生物学—植物学]