Dipterocarps coming from Southeast Asia comprise about 53% of the world’s\rtotal exports of tropical hardwood products. However, the supply of dipterocarps is\rrapidly declining. The government is currently embarking on the establishment of\rdipterocarp plantations and encourages inoculation with ectomycorrhizal fungi to\rimprove seedling growth and survival in degraded sites. Anisoptera thurifera (Blanco)\rBlume and Shorea guiso (Blanco) Blume rooted cuttings were inoculated with\rmycelial beads containing either Pisolithus PTG, Pisolithus H6394, or Astreus sp.\rPisolithus PTG was collected from Acacia mangium stand in Malaysia, Pisolithus\rH6394 from Eucalyptus trees growing in a heavy metal contaminated area in New\rCaledonia, Astreus sp obtained from dipterocarp forest in Mt. Makiling, Philippines.\rThe results showed that Astreus sp gave the highest root colonization (38%), height\rincrement (86%), fine root (51%), coarse root (27%), shoot (43%) and total dry\rweight (40%) of A. thurifera over the control treatment. Astreus – inoculated plants\rhad the highest shoot P uptake (41%) while PTG inoculated ones obtained the highest\rfine root P uptake (0.273 mg/root). The uninoculated plants had the lowest height\rincrement, dry weight, and P uptake. In S. guiso, Pisolithus H6394, gave the highest\rincrement (100%). Data were only obtained from four months of nursery experiments,\rhence, a longer nursery and field experiments should be conducted to achieve a\rcomplete evaluation of the physiological functions of ectomycorrhizal associations.\rMoreover, a wide range of ectomycorrhizal fungi associated with dipterocarps should\rbe incorporated for selection of host compatibility.
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