In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

497Similar to the pattern found for presence of fruiting bodies, ectomycorrhizalinfection occurred on the unburnt control and LB sites. The intensity of infection,however, was low (Table 1). In this study, root samples collected using a soilcorer were used. Roots of dipterocarps were not separated from roots of otherplants. The roots from several subplots were not dipterocarp roots and theseroots did not bear ectomycorrhiza. Since all root samples were considered, theaverage intensity of infection appears low. When roots from the soil corecontaining ectomycorrhiza only were considered, intensities of infection as greatas 76% could be obtained.Table 1. Mycorrhizal associations in an over-burned tropical rainforest inEast KalimantanEctomycorrhizal Spore Number of EndomycorrhizalPlot infection Endomycorrhizal Fungi Infection(%) 53 µm 75 µm 125 µm Total (%)Control 15.5 4 12 3 19 34.6LB 17.8 3.8 11.3 7.1 22.2 16.7SB 0 4.5 13.8 11 29.3 13.3Table 2. Distribution of ectomycorrhiza within each subplot in unburnt controland lightly burnt control sitePlot Sub No of soil core with ectomycorrhiza Range of EctomycorrhizalPlot (from 3 soil cores assessed) Infection (%)Control B2 1 13B9 3 17 – 41F5 0 0H2 0 0H9 2 54 – 76LB B2. 0 0B5 3 36 – 62D3 1 37F2 0 0F5 3 24 – 64Two types of ectomycorrhizal roots: (a) irregularly pinnate with abundantformation of extramatrical hyphae, and (b) monopodial pinnate withoutsignificant amount of extramatrical hyphae were obtained (Figure 2).