Existing Status and Management Guidelines of Dipterocarpus alatus Roxb. Ex situ Gene Conservation of the Royal Forest Department

Abstract

This study was conducted in Diptercarpus alatus Roxb. ex situ gene conservation plots of the Royal Forest Department (RFD) established in 13 provinces. The objectives of the study were to analyze existing status of D. alatus ex situ gene conservation plots and propose their management guidelines accordingly. General information of 36 D. alatus ex situ gene conservation plots was gathered; their growth, tree height and diameter at breast height (DBH) were measured and SWOT Analysis was also applied. The study was undertaken during October 2011-December 2012.

It was revealed that the area and tree age in ex situ gene conservation plots varied largely, ranging from 3-200 rai (0.48-32 ha) and 12-51 years, respectively. The 4x4 and 4x2 m spacing were applied in most of the plots. The ex situ gene conservation plots observed at the Surat Thani Silvicultural Research Station had highest mean annual increment (MAI) in tree height (1.64 m/yr) and MAI in DBH found at the Chaing Rai Silvicultural Research Station was greatest (1.67 cm/yr). The SWOT analysis indicated that most of ex situ gene conservation plots were regularly maintained. They are sufficient potential for genetic selection and mother tree selection. They are served as resources of learning and provide minor forest products to local communities. Although, there are national policies and action plans which implemented for D. alatus gene conservation, plans and activities to manage D. alatus ex situ gene conservation plots does not exist. Moreover, some forestry laws and regulations do not promote commercial forest plantation. Therefore, this study developed seven integrated strategies as management guidelines of ex situ gene conservation of promotion of this species

Keywords:  Diptercarpus alatus Roxb., Ex situ gene conservation, Management, Royal Forest Department