基于GEE平台的舟曲县1998—2019年植被覆盖变化分析  

Analyses of Vegetation Coverage Changes in Zhouqu County from 1998 to 2019 Based on GEE Platform

作　　者：岳奕帆 陈国鹏[1] 王立[1] 李小霞 李瑱 YUE Yi-fan;CHEN Guo-peng;WANG Li;LI Xiao-xia;LI Tian(College of Forestry,Gansu Agriculture University,Lanzhou,Gansu Province 730070,China;Zhouqu County Meteorological Bureau,Gannan Tibetan Autonomous Prefecture,Gansu Province 746300,China)

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070 [2]舟曲县气象局,甘肃甘南藏族自治州746300

出　　处：《草地学报》2022年第6期1534-1542,共9页Acta Agrestia Sinica

基　　金：国家自然科学基金项目(31800352);甘肃省青年科技人才托举工程项目(GXH20210611-11);甘肃农业大学科技创新基金(GSAU-RCZX201708)资助。

摘　　要：为了探究甘肃省舟曲县植被覆盖的时空变化,精确把握区域植被增减情况并及时做出应对措施,本文基于Google Earth Engine云平台,以Landsat 30 m遥感数据作为数据源,辅以DEM与气象数据,运用像元二分模型、趋势分析等方法对舟曲县1998—2019年间的植被覆盖进行逐像元时空变化特征分析。结果表明:22年间舟曲县FVC在0.76~0.85之间波动,整体植被覆盖呈显著增加的趋势(P<0.05),增长速率为3.9×10^(-3) a^(-1),春季和初夏的降水与FVC呈显著正相关(P<0.05);植被覆盖度随海拔的升高呈单峰型变化,在中海拔段(2200~3400 m)表现最优良;县域植被覆盖以轻微改善为主,面积占总面积一半以上;退化趋势也以轻度退化为主,明显退化与显著退化面积占比极低;变异系数呈稳定态势,稳定区域面积占比71.33%。研究植被覆盖的长时序变化特征可为舟曲县生态修复效果评价提供参考依据。To investigate the spatio-temporal changes of vegetation coverage in Zhouqu County,Gansu Province,and to accurately grasp the regional vegetation increase or decrease and make timely countermeasures,we used Landsat 30 m remote sensing data as the data source based on Google Earth Engine cloud platform,supplemented by DEM and meteorological data,and applied image element dichotomous model and trend analysis to analyze the spatio-temporal changes of fractional vegetation coverage in Zhouqu County during 1998—2019.The results showed that fractional vegetation coverage in Zhouqu County fluctuated between 0.76 and 0.85 during the 22 years.The overall fractional vegetation coverage showed a significant increasing trend(P<0.05)with a growth rate of 3.9×10^(-3) a^(-1),and precipitation in spring and early summer was significantly and positively correlated with FVC(P<0.05).The fractional vegetation coverage varied in a unimodal pattern with the increase of elevation,with the best performance in the middle elevation section(2200~3400 m).The fractional vegetation coverage of the country was mainly slightly improved,and the area accounts for more than half of the total area;the degradation trend was also mainly mild degradation,and the percentage of obviously degraded and significantly degraded area was extremely low.The coefficient of variation was stable,and the area of stable regions accounted for 71.33%.The study of the long time series change characteristics of fractional vegetation coverage can provide a reference basis for the evaluation of ecological restoration effect in Zhouqu County.

关 键 词：Google Earth Engine 舟曲县 植被覆盖 时空变化 趋势分析 

分 类 号：S812[农业科学—草业科学]