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应用生态学报 ›› 2023, Vol. 34 ›› Issue (6): 1533-1540.doi: 10.13287/j.1001-9332.202306.025

• 研究论文 • 上一篇    下一篇

基于标准化降水蒸散指数的川西高原干旱时空变化

蓝浩宸1, 刘琰琰1,2,3*, 张玉芳4, 康杨1   

  1. 1成都信息工程大学大气科学学院高原大气与环境四川省重点实验室, 成都 610225;
    2中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室, 银川 750002;
    3南方丘区节水农业研究四川省重点实验室, 成都 610066;
    4四川省农业气象中心, 成都 610072
  • 收稿日期:2022-11-23 接受日期:2023-04-04 出版日期:2023-06-15 发布日期:2023-12-15
  • 通讯作者: *E-mail: liuyy@cuit.edu.cn
  • 作者简介:蓝浩宸, 男, 1997年生, 硕士研究生。主要从事气象防灾减灾研究。E-mail: lhc0071@163.com
  • 基金资助:
    四川省科技厅应用基础研究项目(2020YJ0359)和中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室开放课题(CAMF-202212)

Spatiotemporal variation of drought in the Western Sichuan Plateau based on standardized precipitation evapotranspiration index

LAN Haochen1, LIU Yanyan1,2,3*, ZHANG Yufang3, KANG Yang1   

  1. 1School of Atmospheric Sciences & Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;
    2Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration, Yinchuan 750002, China;
    3Sichuan Key Laboratory of Water-Saving Agriculture Research in Southern Hilly Areas, Chengdu 610066, China;
    4Agro-meteorological Center of Sichuan Province, Chengdu 610072, China
  • Received:2022-11-23 Accepted:2023-04-04 Online:2023-06-15 Published:2023-12-15

摘要: 干旱是川西高原具有一定破坏力的自然灾害,研究其时空变化对该区抗旱防灾、保障农业生产安全、维持生态系统健康具有重要的现实意义。本研究基于川西高原1980—2020年48个气象站点的逐日气象数据,利用Penman-Monteith模型计算潜在蒸散量和标准化降水蒸散指数(SPEI),通过线性倾向分析、干旱特征分析方法对川西高原干旱时空特征进行分析。结果表明: 1980—2020年,川西高原年尺度和春季尺度SPEI呈弱湿润化趋势,夏秋冬季呈干旱化趋势,研究区西南部的山地及东北部的草原为易旱区。研究区年际干旱影响范围弱增,除春季为减少趋势外,夏秋冬季的干旱影响范围均呈增加趋势。全区干旱频率整体偏高,干旱低频区主要位于川西西部和东北部的部分地区,其余均为高频区。

关键词: 标准化降水蒸散指数, 川西高原, 干旱, Penman-Monteith模型

Abstract: Drought is a destructive natural disaster in the Western Sichuan Plateau. Understanding its spatiotemporal variations has important practical significance for drought prevention, ensuring agricultural production safety, and maintaining ecosystem health in the region. Based on the daily meteorological data from 48 meteorological stations in the Western Sichuan Plateau from 1980 to 2020, we used the Penman-Monteith model to calculate potential evapotranspiration and standardized precipitation evapotranspiration index (SPEI). The temporal and spatial variations of drought in the Western Sichuan Plateau were analyzed using linear trend analysis and drought characteristics analysis methods. The results showed that the annual and spring SPEI of the Western Sichuan Plateau showed a weak wetting trend from 1980 to 2020, while summer, autumn, and winter showed a drought trend. The southwest mountains and northeast grasslands in the study region were prone to drought. The range of interannual drought impact in the study area was weakly increasing, with a decreasing trend in spring and an increasing trend in summer, autumn, and winter. The overall drought frequency in the whole region was relatively high. The areas drought of low-frequency were mainly located in parts of west and northeast of the Western Sichuan Plateau, while the rest were high frequency areas.

Key words: standardized precipitation evapotranspiration index (SPEI), Western Sichuan Plateau, drought, Penman-Monteith model