Modulation of the molecular size of humic substances by organic acids of the root exudates |
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Authors: | Antonio Albuzio Giovanni Ferrari |
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Institution: | (1) Faculty of Forestry, University Pertanian Malaysia, 43400 Serdang, Selangor, Malaysia |
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Abstract: | Foliar phosphorus content and mycorrhizal infection of dipterocarp seedlings growing in a 61-year-old forest plantation (site A) and a selectively logged forest (site B) were determined. Mycorrhizal infection levels were high–83.7% forShorea bracteolata and 95.0% forS. leprosula at site A, and 77.8% forS. leprosula and 86.3% forS. curtisii at site B. The seedlings all had similar foliar phosphorus contents although available soil phosphorus at site B was half that at site A. Significant correlations were obtained between foliar phosphorus content and percentage mycorrhizal infection at site B only. |
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Keywords: | dipterocarps foliar phosphorus forest plantation logged forest mycorrhizas Shorea spp |
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