BERAU HERBARIUM
BERAU HERBARIUM
BERAU HERBARIUM
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Dipterocarp genera<br />
Shorea sp<br />
Dipterocarpus sp<br />
Vatica sp<br />
Parashorea sp<br />
Hopea sp<br />
Dryobalanops sp<br />
Anisoptera sp<br />
Cotylelobium sp<br />
Figure 2: Genera abundance of the Dipterocarpaceae - mean of 48 ha<br />
0 1 2 3 4 5 6 7 8 9 10<br />
Accumulative no. of species<br />
600<br />
500<br />
400<br />
300<br />
200<br />
100<br />
0<br />
Importance value index<br />
Figure 3: Species-area curve<br />
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47<br />
ha surveyed<br />
Although the standard deviations are<br />
rather high, indicating high variability<br />
within the sampled plots, the low<br />
standard errors demonstrate they are<br />
representative of overall findings, due<br />
to the high number of replications, n<br />
= 48 (table 1).<br />
Table 1: Species richness<br />
Per ha N Min Max Mean Std.<br />
Error<br />
Std.<br />
Deviation<br />
Total<br />
48 110 198<br />
species<br />
154.65 3.35 23.44<br />
Total<br />
trees<br />
48 417 700 530.75 10.33 71.55<br />
This is also confirmed by the species-area curve. The asymptote is reached with >20 ha of<br />
sampling (figure 3):<br />
4
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