Abstract
Measuring tree species diversity is critical for forest management, particularly where timber species suffer undue anthropogenic pressure. This study was carried out in Bayelsa State, Nigeria. A sample plot was systematically chosen from randomly selected communities in each of the three senatorial districts Bayelsa West (BW), Bayelsa East (BE) and Bayelsa Central (BC) of the State. Each sample plots measured 25 m x 25 m and all timber tree species that were at least six feet above ground level within each sample plot were identified, counted and measured. Fifty individual timbers were encountered in the sample plot at Ogobiri community in BW, fifty-two at Kolo 1 community in BE and fifty-six at Gbarain community in BC belonged to 18, 16 and 14 different families respectively. Families with the largest number of species in the plots were Gentianaceae and Meliaceae, and the highest diversity indices were recorded from BE senatorial district. Generally, the basal area of the sample plots increases with an increase in diameter at breast height. The forested zones were on flat terrain characterized by seasonal flood inundation, and the similarities of timber species in the plots occurred as (BW-BC)> (BW-BE)> (BC-BE). Also, four tree species Coelocaryon preussii, Sacoglottis gabonensis, Milicia excelsa and Triplochiton scleroxylon were identified as rare species, and management options that would ensure ad infinitum supply of timber species were proposed.
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Claims 12
Claim · model-written summary
Timber species in the Ogobiri plot (BW) belonged to 18 different families.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e0“Fifty individual timbers were encountered in the sample plot at Ogobiri community in BW, fifty-two at Kolo 1 community in BE and fifty-six at Gbarain community in BC belonged to 18, 16 and 14 different families respectively”
Claim · model-written summary
Timber species in the Kolo 1 plot (BE) belonged to 16 different families.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e0“Fifty individual timbers were encountered in the sample plot at Ogobiri community in BW, fifty-two at Kolo 1 community in BE and fifty-six at Gbarain community in BC belonged to 18, 16 and 14 different families respectively”
Claim · model-written summary
Timber species in the Gbarain plot (BC) belonged to 14 different families.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e0“Fifty individual timbers were encountered in the sample plot at Ogobiri community in BW, fifty-two at Kolo 1 community in BE and fifty-six at Gbarain community in BC belonged to 18, 16 and 14 different families respectively”
Claim · model-written summary
Gentianaceae and Meliaceae had the largest number of timber species in the plots.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e2“Families with the largest number of species in the plots were Gentianaceae and Meliaceae”
Claim · model-written summary
Diversity indices of timber species were highest in the BE senatorial district.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e3“the highest diversity indices were recorded from BE senatorial district”
Claim · model-written summary
Basal area of timber species plots increases with diameter at breast height.
Verbatim
e1“all timber tree species that were at least six feet above ground level”
e4“Generally, the basal area of the sample plots increases with an increase in diameter at breast height”
Claim · model-written summary
Similarity of timber species among plots was highest for BW-BC and lowest for BC-BE.
Verbatim
e5“the similarities of timber species in the plots occurred as (BW-BC)> (BW-BE)> (BC-BE)”
Claim · model-written summary
Coelocaryon preussii is a rare timber species.
- Taxon
- Coelocaryon preussiiCoelocaryon preussiie6
- Outcome
- rare speciese6
Verbatim
e6“four tree species Coelocaryon preussii, Sacoglottis gabonensis, Milicia excelsa and Triplochiton scleroxylon were identified as rare species”
Claim · model-written summary
Sacoglottis gabonensis is a rare timber species.
- Taxon
- Sacoglottis gabonensis
Sacoglottis gabonensise6 - Outcome
- rare speciese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“four tree species Coelocaryon preussii, Sacoglottis gabonensis, Milicia excelsa and Triplochiton scleroxylon were identified as rare species”
Claim · model-written summary
Milicia excelsa is a rare timber species.
- Taxon
- Milicia excelsa
Milicia excelsae6 - Outcome
- rare speciese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“four tree species Coelocaryon preussii, Sacoglottis gabonensis, Milicia excelsa and Triplochiton scleroxylon were identified as rare species”
Claim · model-written summary
Triplochiton scleroxylon is a rare timber species.
- Taxon
- Triplochiton scleroxylon
Triplochiton scleroxylone6 - Outcome
- rare speciese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“four tree species Coelocaryon preussii, Sacoglottis gabonensis, Milicia excelsa and Triplochiton scleroxylon were identified as rare species”
Claim · model-written summary
Management options should ensure a continuous supply of timber species.
Verbatim
e7“management options that would ensure ad infinitum supply of timber species were proposed”