A review of interactions between irrigation and evapotranspiration

Facing the severe situation of global warming and water shortage, the research of hydrological cycle and regional scale climate has been paid more and more attention. Irrigation and evapotranspiration (ET) affect the hydrological cycle and regional climate. This paper selects articles based on the two title words “irrigation” and “ evapotranspiration”, conducts CNKI (Chinese National Knowledge Infrastructure) cluster analysis on all the search results, discusses the occurrence frequency of keywords in Chinese literature in recent 20 years, and analyzes the research status and development trend of irrigation and evaporation fields. Furthermore, WOS (web of science) is used to analyze the literature on international distribution based on the “irrigation”, “ET” and “irrigation” “transpiration” headings VOSviewer and Scimago graphic analyzed the basic information of the relevant literature. The study found that the hot spots mainly concentrated on ET, irrigation, remote sensing (RS) technology, crop yield, and water utilization rate. With the development of information technology, various RS techniques, learning algorithms, and models have been used to estimate ET and irrigation quantity. Improving the high resolution of the model, the uncertainty of the parameters, and the RS data in the lack of data are the development trend of estimating ET and irrigation quantity in the future. At the same time, irrigation will affect ET, resulting in a decrease in potential evapotranspiration (PET) (measured as reference evapotranspiration (ET₀)) and an increase in actual evapotranspiration (ET_a), but the mechanism of this effect is not very clear. This paper provides a brief review to illustrate the interactions between irrigation and ET, which can provide a good reference for future research on irrigation and ET, as well as a guide for identifying effective measures for adapting water resources to global change.