基于MODIS的普洱市春旱时空演变分析  

Analysis of Spring Drought in Pu′er City Based on MODIS

作　　者：钟雪 杨明龙[1,2] 夏永华 吴学群[1,2] 唐秀娟 韩澳禧[1,2] ZHONG Xue;YANG Minglong;XIA Yonghua;WU Xuequn;TANG Xiujuan;HAN Aoxi(School of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Application Engineering Research Center of Spatial Information Surveying and Mapping Technology in Plateau and Mountainous Areas of Universities in Yunnan Province,Kunming 650093,China;Kunming Surveying and Mapping Institute,Kunming 650091,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南省高校高原山区空间信息测绘技术应用工程研究中心,云南昆明650093 [3]昆明市测绘研究院,云南昆明650091

出　　处：《测绘与空间地理信息》2024年第1期24-28,共5页Geomatics & Spatial Information Technology

基　　金：国家自然科学基金项目(41861054、62266026)资助。

摘　　要：受季风气候的影响,21世纪以来普洱市春季干旱频发,为了探究春季农业干旱的周期性,论文以普洱市为研究区,利用MODIS增强型植被指数EVI和合成的地表温度LST数据计算温度植被干旱指数TVDI模型,对2001—2022年1—4月普洱市春旱进行时空演变分析。结果表明:时间上,2001—2022年TVDI总均值为0.59,近22年的TVDI呈下降趋势,其干旱类型以中旱为主,年内3月、4月是全市最严重时期,2月次之,1月最弱;空间上,2001—2022年1—4月普洱市春旱南北部旱情呈增强趋势,东西部呈减轻趋势,除小部分地区(景东中部及东部、镇沅东部、景谷东部)旱情不稳定外,整体上旱情较为稳定,其干旱重心转移幅度较小,主要分布在景谷与思茅区,整体往南西方向偏移。Influenced by the monsoon climate,Pu'er city has experienced frequent spring drought since the 21st century.In order to explore the periodicity of agricultural drought in spring,this paper takes Pu′er city as the research area and analyzes the spatial and temporal evolution of the spring drought in Pu′er City from January to April between 2001 and 2022,using MODIS EVI,LST data and LST data.The results show that:in time,the total mean value of TVDI from 2001 to 2022 was 0.59,and the TVDI has decreased in the past 22 years,its drought type is mainly medium drought,March and April are the most serious period in the city,the second is in February,the weakest is in January;in space,spring drought has an intensifying trend in north and south of Pu′er city,while a weakening trend is in east and west of Pu′er city,in addition to a small area(center and east of Jingdong,Zhenyuan east,Jinggu east)in which drought is unstable,overall drought is relatively stable,the drought center of gravity shift is smaller,mainly distributed in Jinggu and Simao area,the overall shift is towards to the southwest.

关 键 词：TVDI 土壤湿度 春旱 时空演变 普洱市 

分 类 号：P237[天文地球—摄影测量与遥感]