A review of studies on macroscopic compensated root water uptake model

The ro ot w ater upt ake mo del is essential to the study of v eg etatio n ev apo transpirat ion. I n arid and semi2arid reg io ns, the soil of ten has w ater str ess, which makes the ro ot w ater uptake pro cess even mo re complicat ed. I n o rder to describe t he r oot water uptake mor e accurately, the compensated roo t w ater uptake mo del w as co nceptualized in 1989 and became an important research directio n. There are many ex plo ratio ns abroad, but few in China. Although certain pr og ress has been made on the com2 pensated roo t water uptake mo del, it still has some physical defects. This paper summarizes and analyzes t he dev elo pment histo2 r y o f the compensat ed r oot w ater uptake mo del. It po ints out that the compensated water uptake mo del ov erlooks the physical mechanism of water str ess restr aining the r oot w ater uptake and that using plant stress index to judge w hether there is compen2 sated water uptake has certa in limitatio ns. Based on comprehensiv e analysis, this paper pro po ses that the compensated r oot w a2 ter uptake model should consider the g r ow ing env ir onment of plant ro ots and the supply2demand relationship betw een po tential transpiratio n and available soil moist ur e. The compensated model should co uple the plant stress function, the characteristics of so il moisture distribution, and the dynamic char acteristics of gr oundwater.

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