Establishment of Fitted Models for Topographical Factors and Coexisting Plants Influencing Distribution of Natural Wild Jujube

Fitting mathematical models to describe the influence of topographic factors and coexisting plants on wild jujube distribution was performed provide a scientific basis for forestation. Investigation quadrats, with straight-line distances between adjacent quadrats longer than 100 m, were set up in areas wilderness or low human disturbance, which rich plant species. Data concerning altitude, slope aspect, position degree each investigation quadrat, as well type number plants, collected. Based this, correlations average number, occurrence probability density these variables analyzed, data established. Results analyses show that such gradient, position, play an important role jujube; Vitex negundo var. heterophylla (Franch.) Rehd. coexistence is related distribution. Both conform GaussAmp model altitude. The highest recorded at 581.24 ± 13.78 m above sea level, 462.53 36.67 level. Average fit linear aspect—with 0.49 0.16—indicating light-loving drought-tolerant plant. jujubes position. appears upper part middle slope. Wild correlated quadratic equation model. With increase degree, increased sharply. survey further reinforced observed drought-resistance qualities jujube. by models. No other investigated conformed statistically significant relationship Our results suggest distribution, coexistent species