屈新星, 何云玲, 闫文波, 崔茜琳, 熊巧利. 基于MODIS数据的滇中高原农业干旱时空变化分析[J]. 云南大学学报(自然科学版), 2022, 44(4): 744-753. doi: 10.7540/j.ynu.20210393
引用本文: 屈新星, 何云玲, 闫文波, 崔茜琳, 熊巧利. 基于MODIS数据的滇中高原农业干旱时空变化分析[J]. 云南大学学报(自然科学版), 2022, 44(4): 744-753. doi: 10.7540/j.ynu.20210393
QU Xin-xing, HE Yun-ling, YAN Wen-bo, CUI Xi-lin, XIONG Qiao-li. Spatial-temporal variation of agricultural drought on Central Yunnan Plateau based on MODIS data[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(4): 744-753. DOI: 10.7540/j.ynu.20210393
Citation: QU Xin-xing, HE Yun-ling, YAN Wen-bo, CUI Xi-lin, XIONG Qiao-li. Spatial-temporal variation of agricultural drought on Central Yunnan Plateau based on MODIS data[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(4): 744-753. DOI: 10.7540/j.ynu.20210393

基于MODIS数据的滇中高原农业干旱时空变化分析

Spatial-temporal variation of agricultural drought on Central Yunnan Plateau based on MODIS data

  • 摘要: 利用MODIS增强型植被指数(Enhanced Vegetation Index, EVI)和地表温度(Land Surface Temperature, LST)数据,通过计算温度植被干旱指数(Temperature Vegetation Dryness Index, TVDI),详细分析了滇中高原2001—2020年农业干旱时空变化规律. 结果表明,近20年研究区TVDI年均值呈上升趋势,农业旱情整体呈显著增强趋势;每年4月份的农业旱情最为严重,10月份旱情最轻;TVDI年均值在0.46~0.56之间,中旱和重旱覆盖面积呈扩大趋势;昆明和曲靖主要以轻旱为主,玉溪以中旱为主,楚雄轻旱和中旱相间分布;西部地区旱情整体上有增强趋势;昆明北部及玉溪西部部分高海拔地区、元江河谷及金沙江河谷部分地区,农业干旱变化不稳定,其他地区农业旱情变化逐渐趋于稳定;研究区农业干旱重心先向南移动后再向西南方向移动.

     

    Abstract: Based on MODIS Enhanced Vegetation Index (EVI) and Land Surface Temperature (LST) data, spatial-temporal variation of agricultural drought on Central Yunnan Plateau during 2001-2020 was analyzed by calculating Temperature Vegetation Drought Index (TVDI). The results show that the average annual TVDI in the study area demonstrated an upward trend in the past 20 years, and the overall agricultural drought revealed a significant increasing trend. The agricultural drought was most severe in April, and least severe in October. The annual average values of TVDI ranged from 0.46 to 0.56, and the coverage area of moderate drought and severe drought showed an expanding trend. In Kunming and Qujing mainly occurred mild drought; in Yuxi mainly occurred moderate drought; in Chuxiong were alternately distributed mild drought and moderate drought; and the drought in the west of Central Yunnan Plateau had an increasing trend. The intensity of agricultural drought changed greatly in the northern part of Kunming and the western part of Yuxi, and in the Yuanjiang River Valley and the Jinshajiang River Valley; while in other regions, the change of agricultural drought gradually tended to be stable in the past 20 years. The agricultural drought centers in the study regions mainly moved southward first and then southwestward.

     

/

返回文章
返回