Evaluation of Tecomella undulata R. spatial distribution pattern in Bushehr province

Spatial pattern study of forest species could provide us important and useful information about relationship between species and also forest dynamic. Therefore, it could be an important tools for better management of forest resources. The objectives of this study were to determine special pattern of Tecomella undulata stands in Bushehr province and also, evaluation of different functions capability in T. undulata spatial pattern determination.

In the present study, two stands include Aliabad and Shahnia with 10 and 2 hectares, respectively, were selected in spring 2015 and 100 percent inventory was used. Then to determine the spatial distribution pattern of T. undulate, distance- azimuth method was used. Finally, Ripley's K, L, F, and G functions were used to evaluate T. undulate spatial distribution pattern.

The Kolmogorov-Smirnov goodness of fit test calculation indicated that T. undulata trees distribution in the both studied sites were significantly heterogeneous (P < 0.001). Ripley's K and L heterogeneous functions showed aggregated pattern of T. undulata trees in the study sites. But G function showed aggregated pattern in Aliabad up to 150 meter. While in Shahnia G function indicted different patterns in different distances.

In conclusion, four studied functions showed an aggregated but G function revealed more detail in determination of T. undulata spatial pattern. Such aggregated pattern in T. undulata stands could be because of dry condition and lack of moisture. Based on the results, to revival and afforestation of suitable sites, using aggregated pattern could be useful method to provide shadow and maintaining humidity in soil. That could result in more successful reestablishments of this valuable species.