Статья

Differences in Spatiotemporal Variability of Potential and Reference Crop Evapotranspirations

Keyu XiangCollege of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Xianyang 712100, ChinaXuan ZhangInstitute of Agricultural Science of the Third Division of Xinjiang Production and Construction Corps, Tumushuke 843900, ChinaXiaofeng PengInstitute of Agricultural Science of the Third Division of Xinjiang Production and Construction Corps, Tumushuke 843900, ChinaNing YaoCollege of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Xianyang 712100, ChinaAsim BiswasSchool of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, CanadaDe Li LiuNSW Department of Primary Industries, Wagga Wagga Agricultural Institute, Wagga Wagga, NSW 2650, AustraliaYufeng ZouBakhtiyor PulatovTashkent Institute of Irrigation and Agricultural Mechanization Engineers—National Research University, Qoriy Niyoziy 39, Tashkent 100000, UzbekistanYi LiCollege of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Xianyang 712100, ChinaFenggui LiuAcademy of Plateau Science and Sustainability, Qinghai Normal University, Xining 810008, China

Waterjournal2022en

ABI

Аннотация

Potential evapotranspiration (ETp) and reference crop evapotranspiration (ETo) are two key parameters in hydrology, meteorology, and agronomy. ETp and ETo are related to each other but have different meanings and applications. In this study, the ETp and ETo were distinguished and calculated with the Penman and FAO56 PM equations using the weather data of 551 stations in China from 1961 to 2018. The differences in their spatiotemporal variations were examined with an MMK test, an R/S test, and wavelet analysis. The monthly ETp and ETo were close but the ETp was always larger than the ETo, with values ranging from 1 to 356 mm and 2 to 323 mm, respectively. Their differences varied in different months and sub-regions. The maximum monthly difference transferred from south to north and then back to the south in a yearly cycle, showing spatiotemporal heterogeneity. The annual values of the ETp and ETo were also close, but the ETp was significantly higher than the ETo. The increasing future trends of ETp but decreasing trends of ETo were tested at most sites in China. Although the primary periods were almost the same, their spatial distribution was slightly different. In conclusion, ETp is different from ETo and they should be applied carefully. This study performs a thorough comparison and reveals the underlying basis of and discrepancy between ETp and ETo.

Темы

Plant Water Relations and Carbon Dynamics Hydrology and Drought Analysis Hydrology and Watershed Management Studies

Идентификаторы

DOI: 10.3390/w14060988

Цитирования и источники

Цитирований: 0Использованных источников: 74

Показатели — AkademScholar · Скоро