Improving the Jarvis-type model with modified temperature and radiation functions for sap flow simulations

Hailong Wang, Huade Guan, Na Liu, Chris Soulsby, Doerthe Tetzlaff, Xinping Zhang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Since Professor Paul G. Jarvis proposed a scheme in 1976 that relates stomatal conductance with environmental variables, there have been numerous studies exploring the relationships for estimating transpiration (Ec). Vapor pressure deficit (D) and solar radiation (R) are dominant environmental factors influencing Ec, whilst air temperature (T) is deemed important but often neglected in model applications since D and T are exponentially correlated. Thus, it is uncertain whether to construct the Jarvis-type Ec models with both T and D included will improve model performance. Meanwhile, it is worth mentioning that most Jarvis-type models cannot simulate nocturnal sap flow which has been observed across a wide range of species and climates. Therefore, this study was firstly aimed at developing a generalized temperature stress function and testing its role in the Jarvis-type model, and further improving the model by modifying a widely used radiation function for nocturnal sap flow simulations. The results show that inclusion of a T-stress function for hourly sap flow simulations can avoid overestimation of daily peaks, and the modified Jarvis-type model was able to capture the nocturnal sap flow. These improvements revive the model for ecohydrological applications in a future climate where enhanced temperature effects and increasing nocturnal transpiration resulting from rising nighttime vapor pressure deficits are likely.

Original languageEnglish
Article number124981
Number of pages10
JournalJournal of Hydrology
Volume587
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Environmental changes
  • Jarvis-type model
  • Nocturnal sap flow
  • Stomatal conductance
  • Transpiration

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