摘要
蒙古高原对我国北方生态安全有着重要的影响,植被对气候变化和生态环境有着重要的指示作用,植被的时空变化格局与趋势是评估区域生态状况的重要指标。本研究基于MOD13Q1 NDVI数据,利用R语言调用Google Earth Engine服务进行月度最大值合成,之后使用R语言terra包完成生长季年度均值合成、变异系数计算、Theil-Sen median趋势分析和Mann-Kendall显著性检验以及Hurst指数计算,形成了2001-2021年蒙古高原250m分辨率植被生长季NDVI年际时空变化数据集,包含蒙古高原地区生长季NDVI时空变化格局和趋势特征信息。通过在国家地球系统科学数据中心共享数据,为科学认识蒙古高原区域植被覆盖时空变化规律提供数据支撑。
The Mongolian Plateau has a great impact on the ecological security in northern China.Vegetation has an important indicator effect on climate change and ecological environment.The spatial-temporal pattern and trend of vegetation are important indicators for evaluating regional ecological conditions.Based on MOD13Q1 NDVI data,we used R language to call Google Earth Engine service for monthly maximum synthesis in this study.And we then used R language terra package to complete the annual mean synthesis of the growing season,coefficient of variation calculation,Theil-Sen median trend analysis,Mann-Kendall test and Hurst index calculation,so as to form a dataset of 250m-resolution NDVI of spatio-temporal variations of vegetation in the growing season on the Mongolian Plateau(2001-2021).The dataset contains the spatial and temporal variation patterns and trend characteristics of vegetation on the Mongolian Plateau.Through data sharing,it can provide data support for scientific understanding of temporal and spatial variation of vegetation cover on the Mongolian Plateau.
作者
徐洋
杨雅萍
陈晓娜
乐夏芳
XU Yang;YANG Yaping;CHEN Xiaona;YUE Xiafang(College of Geography and Environmental Science,Henan University,Kaifeng 475004,P.R.China;State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,P.R.China;National Earth System Science Data Center,National Science&Technology Infrastructure of China,Beijing 100101,P.R.China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,P.R.China)
基金
中国科学院网络安全和信息化专项(CAS-WX2021SF-0106-03)
蒙古高原资源环境要素综合考察(2019FY102001)
国家科技基础条件平台建设项目“地球系统科学数据共享网”(2005DKA32300)
中国科学院“十四五”网信建设专项(WX145XQ07-11)
第二次青藏高原综合科学考察研究综合灾害风险评价与防御(2019QZKK0906)。
