Abstract
We studied the floristic composition and structure of the logged-over peat swamp forest in the PT National Sago Prima of PT Sampoerna Agro Tbk. group for future management of the conservation area that has been set aside by the company. In January - February 2012, 25 quadrats of 20 m × 20 m were laid out systematically along a transect, thus covering a sampled area of 1-ha. The results showed that the study site was a regenerating and developing secondary peat swamp forests having high plant species richness. The total number of species recorded was 73 species of 38 families, consisting of 49 species (30 families) of trees (DBH≥ 10 cm ), 42 species (24 families) of saplings (H > 1.5 m and DBH < 10 cm) and 41 species (27 families) of seedlings and undergrowth. Tree density was 550 individuals/ha and total tree basal area was 18.32 m2. The Shannon-Wiener’s Diversity Index for trees was high (3.05) Two tree species with the highest Importance Values (IV) were Pandanus atrocarpus (IV = 45.86 %) and Blumeodendron subrotundifolium (22.46%). The tree families with the highest IV were Pandanaceae (45.86), Myrtaceae (40.37) and Dipterocarpaceae (39.20). Forest structure dominated by trees with a diameter below 20 cm amounting to 408 trees/ha (74.05%). D and E strata with height of less than 20 m, and density of 431 trees/ha (78.36%). Jaccard Similarity index among species, showed strong association between Pandanus atrocarpus and Blumeodendron subrotundifolium and based on this association combined with high IVs, the two parameters of species characterized the forest, hence the forest could be designated as the Pandanus atrocarpus–Blumeodendron subrotundifolium association. Primary forest species with high economic values were still present in the forest. Eleven species can be included in the IUCN Red List, of which Shorea rugosa is in the category of Critically Endangered, Shorea teysmanniana Endangered and Gonystylus bancanus Vulnerable, hence they should be protected.
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Claims 19
Claim · model-written summary
The logged-over forest was regenerating secondary peat swamp forest with high plant richness.
Verbatim
e0“The results showed that the study site was a regenerating and developing secondary peat swamp forests having high plant species richness.”
Claim · model-written summary
The forest survey recorded 73 species from 38 families.
Not reportedTaxon
Verbatim
e0“The total number of species recorded was 73 species of 38 families”
Claim · model-written summary
Tree taxa comprised 49 species in 30 families.
Not reportedTaxon
Verbatim
e0“49 species (30 families) of trees”
Claim · model-written summary
Saplings comprised 42 species in 24 families.
Not reportedTaxon
Verbatim
e0“42 species (24 families) of saplings”
Claim · model-written summary
Seedlings and undergrowth comprised 41 species in 27 families.
Not reportedTaxon
Verbatim
e0“41 species (27 families) of seedlings and undergrowth”
Claim · model-written summary
Tree density was 550 individuals per hectare.
Not reportedTaxon
Verbatim
e0“Tree density was 550 individuals/ha”
Claim · model-written summary
Total tree basal area was 18.32 m2.
Not reportedTaxon
Verbatim
e0“total tree basal area was 18.32 m2”
Claim · model-written summary
The tree Shannon diversity index was high at 3.05.
Not reportedTaxon
Verbatim
e0“The Shannon-Wiener’s Diversity Index for trees was high (3.05)”
Claim · model-written summary
Pandanus atrocarpus had the highest reported importance value, 45.86%.
- Taxon
- Pandanus atrocarpus
Benstonea atrocarpae0 - Outcome
- Importance Valuese0
- Value
- 45.86 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two tree species with the highest Importance Values (IV) were Pandanus atrocarpus (IV = 45.86 %) and Blumeodendron subrotundifolium (22.46%).”
Claim · model-written summary
Blumeodendron subrotundifolium had a reported importance value of 22.46%.
Verbatim
e0“Blumeodendron subrotundifolium (22.46%)”
Claim · model-written summary
Pandanaceae, Myrtaceae and Dipterocarpaceae were the families with the highest importance values.
- Taxon
- PandanaceaePandanaceaee0
- Outcome
- highest IVe0
Verbatim
e0“The tree families with the highest IV were Pandanaceae (45.86), Myrtaceae (40.37) and Dipterocarpaceae (39.20).”
Claim · model-written summary
Trees below 20 cm diameter dominated, at 408 trees per hectare or 74.05%.
Verbatim
e0“Forest structure dominated by trees with a diameter below 20 cm amounting to 408 trees/ha (74.05%).”
Claim · model-written summary
D and E height strata below 20 m held 431 trees per hectare, or 78.36%.
Not reportedTaxon
Verbatim
e0“D and E strata with height of less than 20 m, and density of 431 trees/ha (78.36%).”
Claim · model-written summary
Jaccard similarity indicated a strong association between Pandanus atrocarpus and Blumeodendron subrotundifolium.
- Taxon
- Pandanus atrocarpusBenstonea atrocarpae0
- Outcome
- strong associatione0
- Comparator
- Blumeodendron subrotundifoliume0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jaccard Similarity index among species, showed strong association between Pandanus atrocarpus and Blumeodendron subrotundifolium”
Claim · model-written summary
The authors designated the forest a Pandanus atrocarpus–Blumeodendron subrotundifolium association.
- Taxon
- Pandanus atrocarpus–Blumeodendron subrotundifoliumBenstonea atrocarpae0
- Outcome
- associatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the forest could be designated as the Pandanus atrocarpus–Blumeodendron subrotundifolium association.”
Claim · model-written summary
Primary forest species of high economic value remained present.
Verbatim
e0“Primary forest species with high economic values were still present in the forest.”
Claim · model-written summary
Eleven forest species were identified as eligible for the IUCN Red List.
Verbatim
e0“Eleven species can be included in the IUCN Red List”
Claim · model-written summary
Shorea rugosa, Shorea teysmanniana and Gonystylus bancanus were listed as Critically Endangered, Endangered and Vulnerable, respectively.
- Taxon
- Shorea rugosaRubroshorea rugosae0
- Outcome
- Critically Endangerede0
Verbatim
e0“Shorea rugosa is in the category of Critically Endangered, Shorea teysmanniana Endangered and Gonystylus bancanus Vulnerable”
Claim · model-written summary
The authors recommended protection for the listed threatened species.
- Outcome
- should be protectede0
Not reportedTaxon
Verbatim
e0“hence they should be protected.”