Volume 6 - Mass propagation and nursery management of dipterocarps
The Department of Environment and Natural Resources (DENR) with its great concern and determination to protect and conserve the remaining dipterocarp forests, issued the following directives: DAO #24 Series of 1991 - limitation of logging to second-growth forests; DAO #25 Series of 1992 - creation of the National Protected Areas System; and DAO #21 Series of 1996 - establishment of 10-ha dipterocarp plantations per year in all regions of the country. Over and above all these issuances is a strong political will on the part of the people themselves to promote enrichment planting within timber concessions and establish future dipterocarp plantations.
When the DENR issued the directive to restock dipterocarp forests by planting 10-ha plantations per year in all regions of the country, the immediate solution was wildling collection, which is a ready source of planting materials. However, recovery of wildlings in the nursery has been reported to be very low, percent survival being directly affected by height/age of wildlings upon collection. This alternative measure failed in some regions due to lack of appropriate technologies along nursery care and maintenance (Pollisco, 1997).
A technology on increasing the chances of survival of wildlings in the nursery is needed to optimize the already limited sources of planting stocks. Pollisco (1994a) reported a methodology on the nursery care and maintenance of wildlings that is herein provided in this series. The significant point that it can offer is the comparable survival of wildlings belonging to different height classes/ages; it used to be limited to wildlings 15 - 5- cm high.
The use of rooted cuttings, or vegetative (clonal or asexual) propagation is not a common practice for the planting stock production of dipterocarps. However, in anticipation of the projected demand for dipterocarp planting stock for enrichment planting, assisted natural regeneration and plantation establishment in al regions of the country, a simple, inexpensive sand-rooting technology on clonal macro-propagation by cuttings has been developed (Pollisco, 1994b).
Now that the commercially classified dipterocarps are almost gone, hedge gardens can serve as ex-situconservation area. If certain species or individuals are particularly endangered, shoot material may be taken directly from coppice shoots, or other products of reiteration from the hedge garden for eventual clonal propagation.
Dipterocarps have long been considered as slow-growing hardwood species. This statement seems to be too general this time since ERDB has come up recently with new evidence, as a result of experiments on clonal propagation.