Treatment to Develop Mycorrhiza Formation on Dipterocarp Seedlings
Forests in Indonesia extend over approximately 65 million ha with most of the area dominated by dipterocarps, which are one of Indonesia’s main exports. Most diptero-carps belong to families in which mutualistic associations with fungi are known to form. There is increasing evidence that mycorrhiza colonization increases the survival and growth of planted dipterocarp seedlings (e.g., Chapter 22, this volume). There is little doubt that one of the functions of mycorrhizal symbiosis is to increase the efficiency of the uptake of water and minerals such as phosphate ions from the soil (e.g., Read 1994). This is especially important in Indonesia where 80% of the land area has acidic soils with an associated shortage of available phosphate ions. Therefore, the release of phosphate into the soil by mycorrhizal symbiosis is particularly important for plant growth in Indonesia. Dipterocarp seedlings naturally establish in forest floors which have moderate light and moisture conditions. However, when dipterocarp seedlings are planted in areas affected by shifting cultivation and fire, they are exposed to particularly dry and exposed conditions. As a result of these harsh conditions, the selection of suitable mycorrhizal fungi for use in inoculation can be important, especially during the establishment of dipterocarp forests in reforestation programs (Julich 1988, Smits 1992).
KeywordsMycorrhizal Fungus Rock Phosphate Height Growth Ectomycorrhizal Fungus Mycorrhizal Symbiosis
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