The Evaluation of the Quartered Neighbor Sampling in Density Estimation

The quartered neighbor sampling method is one of the distance sampling methods which is used for measuring the density of vegetation quantity. In this study, first a region about 40 hectares is designated and then 40 point have been randomly selected for sampling in three different methods (the nearest neighbor method, the point-centered quarter method, and the combination method). Since the most important factor in estimation the three density is the average place density, the correlation of average distance among three methods have been calculated by quadrat. The results have shown that among distance methods, just the nearest neighbor method has a significant correlation with quadrat method. The statistical analysis among the three methods with quadrat method has shown that the combination method benefits a higher precision than the two other distance methods. Moreover in estimation the density in a forest with random distribution, the nearest neighbor method provides more acceptable results and has a density near to density of quadrat method.