Spatial Distributions of Wind-dispersed Fruits and Trees of Swintonia schwenkii (Anacardiaceae) in a Tropical Forest of West Sumatra.

英治, 鈴木; 隆司, 甲山

doi:10.3759/tropics.1.131

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…Number of individuals and m*/m index (Iwao, 1977) (Mukhtar et al,1992). We found that the emergent dominant Swintonia schwenkii showed a clear negative correlation between adult rees and seedlings (Suzuki & Kohyama, 1991). Again inSwintonia population, the bimodality in size distribution was more obvious in the Pinang Pinang Plot (Fig.…”

Section: Grewiafloridamentioning

confidence: 73%

“…590-635 m) in the Ulu Gadut area, the basin of Sungei (River) Gadut Gadang, 18 km east from Padang, West Sumatra; for detailed description of the sites see Kohyama et al (1986), Suzuki & Kohyama (1991) and Mukhtar et al (1992). The The census for seedlings and saplings was carried out by tagging numbered tapes, measuring of top height and dbh (when taller than 1.3 m), and mapping the position of the stem base.…”

Section: Methodsmentioning

confidence: 99%

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Spatial Distribution Pattern of Representative Tree Species in a Foothill Rain Forest in West Sumatra.

Kohyama¹,

Suzuki²,

Hotta³

1994

Tropics

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Spatial disribution was analysed for all plot trees and representative tree species in two duplicate l-ha plos established in a foothill rain forest 16 km west from Padang, West Sumatra, Indonesia.All nee trunks ) 8 cm dbh were distributed randomly in both plots. Spatial conelation between dead trees and recruited trees during the 8-year period was locally negative while broadly positive, suggesting that the random spatial pattern is dynamicatly maintained by mechanisms of density-dependent regulation.All of five abundant canopy/subcanorpy non-pioneer species, i.e. Hopea dryobalanoi.des, Gonystylus forbesii, Cleistanthus glandulosus, Mastixia trichotoma, and Grewia florida, and typical pioneer Macaranga spp., including M. gigantea, M. hypoleuca, M. pruinosa and M. triloba, showed a clumped distribution, particularly for smaller size classes. Two subcanopy non-pioneer species, Mastixia and Grewia showed a shift from a regularly decreasing density with height in one plot with larger gap area to bimodal height distribution in the other plot with smaller gap area. They also showed a similar tendency in spatial pattern such that the negative spatial correlation was observed between seedlings (< I m high) and poles (1-10 m high) and bemeen poles and tall rees (> 10 m high) in the plot with larger gap area but that was found between seedlings and tall trees in the plot with smaller gap area. Such pattern was also observed for gapdemandrng Macaranga spp., and they were concluded to be less tolerant than Hopea, Gonystylus and Cleistanthus, in which no height distibution difference nor spatial patt€rn difference was observed between two plots. These more tolerant species showed a positive correlation between tall trees and seedlings, but no correlation between tall fees and poles. These The census for seedlings and saplings was carried out by tagging numbered tapes, measuring of top height and dbh (when taller than 1.3 m), and mapping the position of the stem base. We also measured height and dbh of all nees of these species ) 8 cm dbh. We recorded coordinates of all individuals from dispersion maps of two plots using a digitizer, and devised a program to draw maps of any species and/or categories using a microcomputer.The dispersion maps of each species are shown in Appendices l-6. We applied the statistic indices of spatial distribution and correlarion of lwao (1977). T11e m*/m index (the mean-crowding divided by mean density) of spatial distribution of a given populationislforarandomdistribution,>lforaclumpeddistribution,and

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Section: Grewiafloridamentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Spatial Distribution Pattern of Representative Tree Species in a Foothill Rain Forest in West Sumatra.

Kohyama¹,

Suzuki²,

Hotta³

1994

Tropics

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“…Individuals of C. cf. dourattri in 0-4 m height classes were gathered under and around the crowns of mother trees, contrasting to small individuals of S. schwenkii which were fewer under the crowns of the mother tress than around them in the same plot (Suzuki & Kohyama, 1991). A few individuals of C. cf.…”

Section: Resultsmentioning

confidence: 96%

Regeneration Process of a Climax Species Calophyllum cf. soulattri in Tropical Rain Forest of West Sumatra.

Mukhtar

英治

隆司

et al. 1992

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All individuals of Calophyllum cf. soulattri Burm. (Guttiferae) were surveyed in two plots set in a tropical rain forest, Padang, West Sumatra. In Pin plot (1.0 ha) covered mostly by mature patch of 50-60 m in height, we found four mother trees of C. cf. soulattri (27-39 m in height), and 2,722 juveniles (0-9 m). Instead of the seedling abundance, the mother trees made fruits only in 1981 during the survey period from 1981 to 1989. They seemed to disperse fruits in the whole area of plot. The seedlings and saplings in a subplot of 14 m2 adjacent to a mother tree, 30-38% of them survived from 1981 to 1989 and grew 2.5 cm/yr in height. Bigger juveniles (4-9 m) occurred more often in area apart from mother trees. In Gaja plot (0.86 ha) having more gaps than Pin Plot, only 31 C. cf. soulattri existed, which were 0.7-17 m in height.The following regeneration characteristics are supposed for this species. 1) Only old and big tree can reproduce, and the dispersal area of propagule is wide; 2) the dispersed propagule can survive around the mother trees; 3) the residual life span after maturation is short, and die before offsprings start reproduction. These characteristics will make a mosaic of two types of patches: one composed of mother tree, seedlings and saplings, and the other of young poles. The patch size will be related to dispersal area. Thus the plant population exists continuously in the same area, while sporadic reproduction events create the mosaic pattern.

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“…When thbse poles at a clump could be assumed to be offsprings of the same grandmother as four mother trees, the area could be furthermore limited to the southern part of the estimated area by zoning 10-50 m distance from this clump (Fig. 1 (Suzuki & Kohyama, 1991). When we compare them at the matured fruit stage for Calophyllum cf.…”

Section: Discussionmentioning

confidence: 99%

“…We have monitored the population dynamics of major species at two I-ha permanent plots of a foothill rain forest in Ulu Gadut, West Sumatra since 1980. Spatial distribution patterns of major species in this forest have been revealed and their regeneration mechanisms were discussed with demographic data (Suzuki & Kohyama, 1991; Mukhtar et aZ., 1992; Kohyama et aZ., 1994). This study follows the previous paper (Mukhtar et al, 1992) this cohort population in terms of rates of growth, recruitment and mortality.…”

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Population Dynamics of a Cohort from Mast Fruiting in 1981: Regeneration process of a climax species Calophyllum cf. soulattri in a tropical rain forest of West Sumatra.

Mukhtar

健²,

Zalfiati

et al. 1998

Tropics

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Spatial Distributions of Wind-dispersed Fruits and Trees of Swintonia schwenkii (Anacardiaceae) in a Tropical Forest of West Sumatra.

Cited by 13 publications

References 7 publications

Spatial Distribution Pattern of Representative Tree Species in a Foothill Rain Forest in West Sumatra.

Spatial Distribution Pattern of Representative Tree Species in a Foothill Rain Forest in West Sumatra.

Regeneration Process of a Climax Species Calophyllum cf. soulattri in Tropical Rain Forest of West Sumatra.

Population Dynamics of a Cohort from Mast Fruiting in 1981: Regeneration process of a climax species Calophyllum cf. soulattri in a tropical rain forest of West Sumatra.

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