基于优选遥感干旱指数的华北平原干旱时空变化特征分析  

Analysis of drought variation characteristics in North China Plain based on optimized remote sensing drought index

作　　者：吴天晓 李宝富[1,2] 郭浩 王云倩 朱艳冰 廉丽姝 WU Tianxiao;LI Baofu;GUO Hao;WANG Yunqian;ZHU Yanbing;LIAN Lishu(School of Geography and Tourism,Qufu Normal University,Rizhao 276826,China;Institute of Yellow River Ecology,Qufu Normal University,Rizhao 276826,China)

机构地区：[1]曲阜师范大学地理与旅游学院,日照276826 [2]曲阜师范大学黄河生态研究院,日照276826

出　　处：《生态学报》2023年第4期1621-1634,共14页Acta Ecologica Sinica

基　　金：山东省自然科学基金项目(ZR2020MD117,ZR2021YQ28)。

摘　　要：基于中分辨率成像光谱仪(MODIS)产品和气象资料,对比分析了作物缺水指数(CWSI)、干旱严重度指数(DSI)、归一化植被供水指数(NVSWI)和温度植被干旱指数(TVDI)表征华北平原干旱状况的适用性,并基于优选后的指数研究了2000—2018年干旱的时空变化特征。结果表明:(1)CWSI在反映干旱的效果上明显优于另外三种干旱指数。(2)时间上,2000—2018年春季干旱最严重,其次是秋季和冬季,夏季干旱最轻,但春季干旱强度有所下降,速率为-0.03/10a,而其他三季均呈增加趋势,速率为(0.01—0.08)/10a。(3)空间上,华北平原东部和东南部发生轻旱频率高,西部和北部中旱及以上干旱频率较高。山东省西北部及河南省东部、安徽省北部等地春旱呈显著减弱趋势(P<0.05);夏季华北平原东南部干旱增加趋势显著(P<0.05),而北部减弱趋势显著(P<0.05);秋季华北平原西南一带干旱上升趋势较大;冬季西部、中部及南部干旱增加趋势显著(P<0.05)。Based on Moderate-resolution Imaging Spectroradiometer(MODIS) products and meteorological data, the applicability of crop water shortage index(CWSI), drought severity index(DSI), normalized vegetation water supply index(NVSWI) and temperature vegetation dryness index(TVDI) to characterize the drought condition in North China Plain was compared and analyzed. The spatio-temporal variation characteristics of drought from 2000 to 2018 were studied based on the optimized index. The results showed that:(1) the CWSI was significantly better than the other three drought indexes in reflecting drought.(2) In terms of time, the drought was the most serious in spring from 2000 to 2018, followed by autumn, winter and summer. However, the drought intensity of North China Plain decreased in spring at a rate of-0.03/10a, while the other three seasons showed an increasing trend at a rate of(0.01—0.08)/10a.(3) Spatially, the frequency of light aridity was high in the east and southeast of North China Plain, and the frequency of moderate aridity and above in the west and north was high. The spring aridity in the northwest of Shandong Province, the east of Henan Province and the north of Anhui Province showed a significant weakening trend(P<0.05);In summer, the aridity in the southeast of North China Plain increased significantly(P<0.05), while it decreased significantly(P<0.05) in the north;In autumn, the aridity in the southwest of North China Plain increased greatly;The aridity in the west, middle and south increased significantly in winter(P<0.05).

关 键 词：作物缺水指数 干旱指数 遥感 华北平原 

分 类 号：P407[天文地球—大气科学及气象学] P426.616