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中国农学通报 ›› 2024, Vol. 40 ›› Issue (8): 68-73.doi: 10.11924/j.issn.1000-6850.casb2023-0321

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

基于闪烁通量和土壤水分的春玉米干旱研究

戴欣钰1,2(), 刘聪3, 李琪1,2(), 德吉卓玛1,2, 吴东丽3   

  1. 1 江苏省农业气象重点实验室,南京 210044
    2 南京信息工程大学,南京 210044
    3 中国气象局气象探测中心,北京 100081
  • 收稿日期:2023-04-19 修回日期:2023-08-20 出版日期:2024-03-10 发布日期:2024-03-10
  • 通讯作者:
    李琪,男,1977年出生,河北新城人,副教授,博士,主要从事农业气象学研究。通信地址:210044 江苏省南京市浦口区宁六路219号,Tel:025-58731378,E-mail:
  • 作者简介:

    戴欣钰,女,1998年出生,浙江江山人,硕士研究生,研究方向:农业气候资源评估与利用。通信地址:210044 江苏省南京市浦口区宁六路219号,Tel:025-58731378,E-mail:

  • 基金资助:
    中国气象局气象探测中心青年科技课题“基于闪烁通量和土壤水分的小麦/玉米作物干旱指标及卫星遥感检验”(MOCQN202108); 中国气象局气象探测中心生态环境观测技术创新团队资助

Study on Drought of Spring Maize Based on Scintillation Flux and Soil Moisture

DAI Xinyu1,2(), LIU Cong3, LI Qi1,2(), DEKYI Droma1,2, WU Dongli3   

  1. 1 Jiangsu Key Laboratory of Agrometeorology, Nanjing 210044
    2 Nanjing University of Information Science & Technology, Nanjing 210044
    3 Meteorological Observation Centre of China Meteorological Administration, Beijing 100081
  • Received:2023-04-19 Revised:2023-08-20 Published-:2024-03-10 Online:2024-03-10

摘要:

为了识别河北省怀来县春玉米生长季内不同生育期的干旱情况。基于大孔径闪烁仪观测系统的数据,本研究用河北省怀来县2021年春玉米的实际蒸散量代替潜在蒸散量,计算了修订的水分亏缺指数(RCWDI)。根据土壤相对湿度得到的春玉米实际干旱等级,重新构建了RCWDI的干旱等级,并利用2019年的数据进行了验证。结果表明:2021年怀来县春玉米生育期内降水量和实际蒸散量之间有显著的相关关系,降水量与蒸散量差值的累积值可以反映春玉米的干旱状况。2021年怀来县春玉米干旱主要发生在播种到拔节期。2019年利用RCWDI获得的干旱等级与基于土壤水分得到的干旱等级相似度高达80%。研究表明基于闪烁通量修订的水分亏缺指数及其干旱等级具有一定的适用性。

关键词: 闪烁通量, 干旱, 水分亏缺指数, 春玉米

Abstract:

To identify drought conditions at different fertility stages within the growing season of spring maize in Huailai County, Hebei Province, this study calculated a revised crop water deficit index (RCWDI) by using the actual evapotranspiration instead of potential evapotranspiration for spring maize in 2021 in Huailai County, Hebei Province based on the data from the large-aperture scintillometer observation system. According to the actual drought grade of spring maize obtained by soil relative humidity, the drought grade of RCWDI was reconstructed and verified by the data of 2019. The results showed that there was a significant correlation between precipitation and actual evapotranspiration during the fertility period of spring maize in 2021 in Huailai County, and the cumulative value of the difference between precipitation and evapotranspiration could reflect the drought situation of spring maize. The drought of spring maize in Huailai County in 2021 mainly occurred from sowing to jointing stage. Drought ratings obtained by RCWDI in 2019 are up to 80% similar to those based on soil moisture. The study shows that the revised crop water deficit index and its drought grade based on scintillation flux have certain applicability.

Key words: scintillation flux, drought, crop water deficit index (CWDI), spring maize