摘要或動機

Dipterocarps coming from Southeast Asia comprise about 53% of the world’s\r
total exports of tropical hardwood products. However, the supply of dipterocarps is\r
rapidly declining. The government is currently embarking on the establishment of\r
dipterocarp plantations and encourages inoculation with ectomycorrhizal fungi to\r
improve seedling growth and survival in degraded sites. Anisoptera thurifera (Blanco)\r
Blume and Shorea guiso (Blanco) Blume rooted cuttings were inoculated with\r
mycelial beads containing either Pisolithus PTG, Pisolithus H6394, or Astreus sp.\r
Pisolithus PTG was collected from Acacia mangium stand in Malaysia, Pisolithus\r
H6394 from Eucalyptus trees growing in a heavy metal contaminated area in New\r
Caledonia, Astreus sp obtained from dipterocarp forest in Mt. Makiling, Philippines.\r
The results showed that Astreus sp gave the highest root colonization (38%), height\r
increment (86%), fine root (51%), coarse root (27%), shoot (43%) and total dry\r
weight (40%) of A. thurifera over the control treatment. Astreus – inoculated plants\r
had the highest shoot P uptake (41%) while PTG inoculated ones obtained the highest\r
fine root P uptake (0.273 mg/root). The uninoculated plants had the lowest height\r
increment, dry weight, and P uptake. In S. guiso, Pisolithus H6394, gave the highest\r
increment (100%). Data were only obtained from four months of nursery experiments,\r
hence, a longer nursery and field experiments should be conducted to achieve a\r
complete evaluation of the physiological functions of ectomycorrhizal associations.\r
Moreover, a wide range of ectomycorrhizal fungi associated with dipterocarps should\r
be incorporated for selection of host compatibility.