外文摘要：BACKGROUNDDrought affects the characteristics of water use during crop production and so quantitatively evaluating the impacts is important. However, it remains unclear how crop water use responds to drought. To address this gap, water footprint (WF) and standardized precipitation evapotranspiration index (SPEI) were calculated by remote sensing approaches to assess the effects of drought on crop water use. Rainfed maize is the most important crop in Jilin Province, and its growth and water use are more susceptible to drought. The present study explored not only the impact of growing season drought on the maize WF values in Jilin Province, but also the response of WF values to drought at different time scales.RESULTSSpatially, 72.94% of the WFblue pixels showed a non-significant increase, and the WFgreen in 68% pixels decreased significantly, being mainly concentrated in the middle region. Furthermore, the pixels affected by monthly time scale drought were mainly in the middle region, whereas the pixels affected by annual time scale drought were mainly in the western region.CONCLUSIONDrought not only affected on the source and structure of agricultural water consumption, but also had different effects on WF values at different time scale. These effects had obvious spatial differences. The present study systematically explored the effects of drought on the WF values for rainfed maize in different climate regions and a consideration of these effects could provide valuable information on rainfed maize growth and the agricultural water use response to a changing climate. & COPY; 2023 Society of Chemical Industry.
外文关键词：remote sensing;water footprint;Drought;multi-time scales;rainfed maize
作者：Li, Bo;Qin, Lijie;Qi, Hang;Wang, Jianqin;Dang, Yongcai;Lv, Mingzhu;He, Hongshi
作者单位：Univ Missouri;Northeast Normal Univ
期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
期刊影响因子：0.0
出版年份：2024
出版刊次：104（2）
原文传递申请：江苏省科技资源（工程技术文献）统筹服务平台