Research And Analysis Of Water Requirement In Growth Period Of The Wild Salix Gordejevii In The Hunshandake Desert Based On Dual Source Model

Hunshandake desert is one of ten prominent big desert in the north of China,large areas of degraded meadow due to the bad desertification situation in recent years,it seriously affect climate change and the sustainable development of ecological environment.The Salix gordejevii which has strong water-holding capacity in the desert is playing an important role in conserving water and soil resources,breaking wind and fixing sands to the whole ecological system,and it is also to become the dominant species windbreak and sand-fixation in the sand.Therefore it is very crucial to know the physiological activity of Salix gordejevii for the change of water demand regulation and the water consumption in the growth period.The paper mainly through the study of natural vegetation of stomatal conductance and meteorological data colletion,use the double sites model to calculate the amount of evaporation of the Salix gordejevii in the growth period,in order to analysis and comparison the applicability of the model.Research is mainly manifested in the following points.1. By analyzing the change rules of stomatal conductance of three kinds of natural vegetation, according to the external environment factor’s influence for natural vegetation stomatal conductance, screen out the main influence factors and establish the multiple regression equation.2. Using a combination of factor factorial model and correction factor model to simulate the three kinds of natural vegetation of stomatal conductance, and optimizing the best parameter3. By using the Shuttleworth-Wallce dual source model to simulate the process of evapotranspiration in2013during the growth of Salix gordejevii,and through comparison and analysis evapotranspiration simulation calculation in the growth period of Salix gordejevii for many years.Based on the comparative analysis between the actual evaporation and the simulation value that the measured transpiration of Aalix gordejevii and bottom of canopy,to validate the matching of the model.4. The parameter calculation model based on the evaporation process variables, the model of five resistance responsivity of the model were analyzed, and the model of soil resistance on the model of response is the largest.