以天然梭梭林分的距离结构情况为研究对象,通过对梭梭林分最近邻距离概率分布模型的构建,建立预估梭梭林木距离的模型,为荒漠树种林分空间结构的分析与重建提供方法支持。利用Stochastic Geometry 4.1软件随机生成均匀、随机和团状3种分布类型的模拟样地,使用Matlab软件对模拟样地中的目标点以及实测样地的林分进行最近邻距离分布模型拟合,并对模型进行了拟合参数估计和拟合效果的Kolmogorov-Smirnov(K-S)检验。结果表明:模拟样地和实测样地的最近邻距离分布可以用两参数威布尔分布(Weibull-2)模型进行拟合,拟合效果较好,其中模拟样地和实测样地距离分布拟合的R²值均在0.883~0.997之间,均方根误差(RMSE)取值分别在0.003~0.052与0.007~0.041之间,D值均小于D_0.05值,结果服从原定假设。因此,Weibull-2分布可以用来描述天然梭梭林分距离结构的分布,且表现出了良好的适应性,说明Weibull-2分布可以用来对不同树种的林分空间结构进行描述。

This study takes the distance structure of the natural Haloxylon ammodendron stand as the research object.Through the construction of the nearest neighbor distance probability distribution model of the Haloxylon ammodendron stand,an estimated distance model independent of the tree species will be established,which will support the analysis of the spatial structure of different tree species in the forestry investigations.In this study,we use Matlab to generate three simulated plots of uniform,random and mass distribution types,and fit the nearest neighbor distance distribution model for the target points in the simulated plots and the stands of the measured plots.Through the Kolmogorov-Smirnov(K-S) test of the model fitting parameters,the results show that the simulation sample is simulated.The nearest neighbor distribution of ground and measured plots can be fitted with the Weibull distribution(Weibull-2) model with sound fitting eflects,in which the R² value of simulated and measured plots is between 0.8832 to 0.9966 and the mean square root error(RMSE) is between 0.0034 to 0.0516 and 0.0066 to 0.0414.The value of D is less than the D_0.05 value as the result meets the original hypothesis.Therefore,the Weibull-2 distribution model can be used to describe the distribution of the distance structure of the natural Haloxylon ammodendron,which shows good adaptability.It shows that the Weibull-2 distribution model can be used to describe the spatial structure of the stand of different tree species.