Abstract
Forest plantations are important in meeting national and global demand for industrial wood due to their fast growth rate and high productivity. They can produce 3–10 times higher biomass than natural forests, making them important for climate change mitigation. We examined the growth characteristics, productivity and carbon storage of age series Nauclea diderrichii and Terminalia ivorensis plantations at Forestry Research Institute of Nigeria. Tree growth variables were measured in 25 m x 25 m temporary sample plots selected from 6 to 24 years plantations of the two species. Biomass data were obtained through non-destructive means. Mean diameter at breast height (DBH) ranged from 13.3 cm (6 years) - 37 cm (24 years) in T. ivorensis and 18.3 cm (13 years) - 22.4 cm (14 years) in N. diderrichii stands while mean total height varied from 10.1 m - 21.2 m and 16.5 m - 17.8 m in respective plantations of the two species. Both species demonstrated a high degree of merchantability, with no difference between them (66.5 - 81.4% in T. ivorensis and 77.0 - 77.2% in N. diderrichiii). Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha, respectively while they were 12.0 m2/ha - 12.1 m2/ha, 118.4 m3/ha - 195.8 m3/ha, 187.0 t/ha - 214.6 t/ha and 93.5 t/ha - 107.3 t/ha in N. diderrichii plantations. The two tree species have a good growth rate and productivity when compared with some tropical plantation tree species. The productivity, merchantability, biomass and carbon stock of N. diderrichii and T. ivorensis stands are indicating their suitability as candidates for good quality timber, carbon sequestration and climate change mitigation.
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Claims 12
Claim · model-written summary
Terminalia ivorensis merchantability was 66.5-81.4%.
- Taxon
- T. ivorensisTerminalia ivorensise0
- Outcome
- merchantabilitye0
- Value
- 66.5 - 81.4%e0
Verbatim
e0“Both species demonstrated a high degree of merchantability, with no difference between them (66.5 - 81.4% in T. ivorensis”
Claim · model-written summary
Terminalia ivorensis basal area ranged from 9.4 to 19.4 m2/ha.
- Taxon
- T. ivorensisTerminalia ivorensise0
- Outcome
- basal areae0
- Value
- 9.4 - 19.4 m2/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha”
Claim · model-written summary
Terminalia ivorensis stand volume ranged from 63.5 to 252 m3/ha.
- Taxon
- T. ivorensisTerminalia ivorensise0
- Outcome
- volumee0
- Value
- 63.5 - 252 m3/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha”
Claim · model-written summary
Terminalia ivorensis biomass ranged from 48.8 to 188.6 t/ha.
- Taxon
- T. ivorensisTerminalia ivorensise0
- Outcome
- biomasse0
- Value
- 48.8 t/ha - to 188.6 t/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha”
Claim · model-written summary
Terminalia ivorensis carbon stock ranged from 24.4 to 94.3 t/ha.
- Taxon
- T. ivorensisTerminalia ivorensise0
- Outcome
- carbon stocke0
- Value
- 24.4 t/ha - 94.3 t/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha”
Claim · model-written summary
Nauclea diderrichii basal area ranged from 12.0 to 12.1 m2/ha.
- Taxon
- N. diderrichiiNauclea diderrichiie0
- Outcome
- basal areae0
- Value
- 12.0 m2/ha - 12.1 m2/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha, respectively while they were 12.0 m2/ha - 12.1 m2/ha, 118.4 m3/ha - 195.8 m3/ha, 187.0 t/ha - 214.6 t/ha and 93.5 t/ha - 107.3 t/ha in N. diderrichii plantations”
Claim · model-written summary
Nauclea diderrichii stand volume ranged from 118.4 to 195.8 m3/ha.
- Taxon
- N. diderrichiiNauclea diderrichiie0
- Outcome
- volumee0
- Value
- 118.4 m3/ha - 195.8 m3/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha, respectively while they were 12.0 m2/ha - 12.1 m2/ha, 118.4 m3/ha - 195.8 m3/ha, 187.0 t/ha - 214.6 t/ha and 93.5 t/ha - 107.3 t/ha in N. diderrichii plantations”
Claim · model-written summary
Nauclea diderrichii biomass ranged from 187.0 to 214.6 t/ha.
- Taxon
- N. diderrichiiNauclea diderrichiie0
- Outcome
- biomasse0
- Value
- 187.0 t/ha - 214.6 t/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha, respectively while they were 12.0 m2/ha - 12.1 m2/ha, 118.4 m3/ha - 195.8 m3/ha, 187.0 t/ha - 214.6 t/ha and 93.5 t/ha - 107.3 t/ha in N. diderrichii plantations”
Claim · model-written summary
Nauclea diderrichii carbon stock ranged from 93.5 to 107.3 t/ha.
- Taxon
- N. diderrichiiNauclea diderrichiie0
- Outcome
- carbon stocke0
- Value
- 93.5 t/ha - 107.3 t/hae0
Verbatim
e0“Mean basal area, volume, biomass and carbon stock in T. ivorensis stands were: 9.4 - 19.4 m2/ha, 63.5 - 252 m3/ha, 48.8 t/ha - to 188.6 t/ha and 24.4 t/ha - 94.3 t/ha, respectively while they were 12.0 m2/ha - 12.1 m2/ha, 118.4 m3/ha - 195.8 m3/ha, 187.0 t/ha - 214.6 t/ha and 93.5 t/ha - 107.3 t/ha in N. diderrichii plantations”
Claim · model-written summary
Both species were highly merchantable without a difference between them.
- Taxon
- N. diderrichii and T. ivorensisNauclea diderrichiiTerminalia ivorensist0
- Outcome
- merchantabilitye0
- Direction
- no differencee0
- Comparator
- both speciese0
Verbatim
e0“Both species demonstrated a high degree of merchantability, with no difference between them”
t0“N. diderrichii and T. ivorensis”
Claim · model-written summary
The two species had good growth and productivity compared with some tropical plantation species.
- Taxon
- N. diderrichii and T. ivorensisNauclea diderrichiiTerminalia ivorensist0
- Outcome
- growth rate and productivitye0
- Direction
- goode0
- Comparator
- some tropical plantation tree speciese0
Verbatim
e0“The two tree species have a good growth rate and productivity when compared with some tropical plantation tree species.”
t0“N. diderrichii and T. ivorensis”
Claim · model-written summary
The stands are suitable candidates for timber, carbon sequestration and climate mitigation.
- Taxon
- N. diderrichii and T. ivorensisNauclea diderrichiiTerminalia ivorensist0
- Outcome
- suitability as candidates for good quality timber, carbon sequestration and climate change mitigatione0
Verbatim
e0“The productivity, merchantability, biomass and carbon stock of N. diderrichii and T. ivorensis stands are indicating their suitability as candidates for good quality timber, carbon sequestration and climate change mitigation.”
t0“N. diderrichii and T. ivorensis”