1989 Volume 15 Issue 4 Pages 20-30
In order to analyze the influence of soil moisture conditions on the growth of Salix matsudana Koidz. which is used for refor estation inMu Us Shamo desert in China, the numerical model was proposed. By using meteorological data, the model could predict the timesequential changes of soil moisture conditions and char acteristics of transpiration. The model had twoparts: 1) the dry sand surfacemodel 2) the root absorbing distribution model. The soil moisture and root absorbing distribution could be predicted by model 2 using the infiltration rate below the surface estimated by model 1. The model was applied to the two sample trees of different forms planted in locations of different soil moisture conditions. The characteristics of consumption of soil water of each tree were predicted timesequetialy using the following data have been observed by the Japan-China joint research group since1986: Micrometeorological situations and soil moisture conditions of the dune, evaporation from the sand surface, and transpiration of Salix matsudana. The form variations of the two trees were a result of the soil water conditions depending whether the soil water could reach the root zone from the ground water level by capillary rising or not. The results of prediction suggested that the adaptation strategy of both trees were effective in avoiding the blocking of absorption by soil water deficit in dry season.
