参考文献:
[1] Zhang, L. F., Jiao, W. Z., Zhang, H. M., et al. Studying drought phenomena in the continental United States in 2011 and 2012 using various drought indices [J]. Remote Sensing of Environment, 2017, 190: 96-106.
     [2] Cong, D. M., Zhao, S. H., Chen, C., et al. Characterization of droughts during 2001-2014 based on remote sensing: A case study of Northeast China [J]. Ecological Informatics, 2017, 39: 56-67.
     [3] 吴泽棉, 邱建秀, 刘苏峡等. 基于土壤水分的农业干旱监测研究进展[J]. 地理科学进展, 2020, 39(10): 1758-1769.
     [4] IPCC. Climate Change 2021: The Physical Science Basis. http://www.ipcc.ch.
     [5] 中华人民共和国应急管理部. 2021年全国自然灾害基本情况[EB/OL]. [2022-01-23]. https://www.mem.gov.cn/xw/yjglbgzdt/202201/t20220123_407204.shtml.
     [6] 罗静, 张镱锂, 刘峰贵等. 青藏高原东北部河湟谷地1726年耕地格局重建[J]. 地理研究, 2014, 33(7): 1285-1296.
     [7] 牟伶俐, 吴炳方, 闫娜娜等. 农业旱情遥感指数验证与不确定性分析[J]. 水土保持通报, 2007(2): 119-122.
     [8] Kogan, F. N. Application of vegetation index and brightness temperature for drought detection [J]. Advances in Space Research, 1995, 15(11): 91-100.
     [9] Bayarjargal, Y., Karnieli, A., Bavasgalan, M., et al. A comparative study of NOAA-AVHRR derived drought indices using change vector analysis [J]. Remote Sensing of Environment, 2006, 105(1): 9-22.
     [10] Eskinder, G., Oagile, D., Reuben, S., et al. Analysis of the long-term agricultural drought onset, cessation, duration, frequency, severity and spatial extent using Vegetation Health Index (VHI) in Raya and its environs, Northern Ethiopia [J]. Environmental Systems Research, 2018, 7(1): 1-18.
     [11] Zhang, A. X., Jia, G. S. Monitoring meteorological drought in semiarid regions using multi-sensor microwave remote sensing data [J]. Remote Sensing of Environment, 2013, 134: 12-23.
     [12] Kogan, F. N. Operational space technology for global vegetation assessment [J]. Bulletin of the American Meteorological Society, 2001, 82(9): 1949-1964.
     [13] 丁佳, 刘星雨, 郭玉超等. 1980-2015年青藏高原植被变化研究[J]. 生态环境学报, 2021, 30(2): 288-296.