Parametrization of lower limit temperature in crop water stress index model: A case study of plantation.

The lower limit temperature in the crop water stress index (CWSI) model refers to the canopy temperature () or the canopy-air temperature differences () under well-watered conditions, which has significant impacts on the accuracy of the model in quantifying plant water status. At present, the direct estimation of lower limit temperature based on data-driven method has been successfully used in crops, but its applicability has not been tes-ted in forest ecosystems. We collected continuously and synchronously and meteorological data in a plantation at the southern foot of Taihang Mountain to evaluate the feasibility of multiple linear regression model and BP neural network model for estimating the lower limit temperature and the accuracy of the CWSI indicating water status of the plantation.