The invention relates to a method for estimating the
transpiration water consumption of a
populus euphratica forest. The adopted technical scheme is as follows: the method comprises the following steps of: calculating the effective photosynthetic
radiation quantity; calculating the saturation vapour
pressure difference; establishing a model; estimating individual
diameter-class distribution in the
populus euphratica forest; establishing a
diameter class and sapwood area fitted equation; and calculating the
transpiration water consumption. By means of the method disclosed by the invention, a
model simulation method is adopted; a variable, namely the sap flow velocity, depending on field measurement is derived by utilization of two easily obtained data including the effective photosynthetic
radiation quantity and the vapour
pressure difference; the individual
diameter-class sizes in the
populus euphratica forest are estimated according to an individual diameter-class
distribution model; scale deduction from a single populus euphratica to the populus euphratica forest is realized; and the
transpiration water consumption is calculated through a definite
integral method according to populus euphratica growth characteristics. According to the method for estimating the transpiration of the populus euphratica forest disclosed by the invention, according to an environment where the populus euphratica forest is, the effective photosynthetic
radiation quantity and saturation vapour
pressure difference parameters are adjusted; therefore, the
estimation method can be widely suitable for calculating the transpiration of the populus euphratica forest under
multiple site conditions; therefore,
field observation limitation can be gotten rid of; the transpiration of the populus euphratica forest in the past time period is recalled; the transpiration of the populus euphratica forest in the future time period is predicted; and thus, theoretical basis is provided for developing protection of
plant species and prompting ecological construction.