Claim · model-written summary
Adding both D0 and Hb gives a substantial improvement of the Ra2 values.
- Taxon
- Terminalia tree speciese1
- Treatment
- both D0 and Hb were addede7
- Outcome
- Ra2 valuese7
- Direction
- substantial improvemente7
Not reportedComparator
Verbatim
e1“some selected economically important natural Terminalia tree species common to central Sudan”
e7“substantial improvement of the Ra2 values were obtained when both D0 and Hb were added”
Title
Taper and Volume Models for Some Terminalia Tree Species
Sudanese Online Research Journal 2021. doi:10.51527/v2i1.14me
Other claims from this paper (8)
- Method / resource Taper-17 and Taper-19 were among the best two taper models for both species, with R2 range 0.94 – 0.93.
- Recommendation Application of the selected models is useful only at local stand level or in similar biological and stand structure conditions.
- Intervention effect Replacing total tree height with bole height improves parameter significance and the coefficient of determination of the volume models.
- Observation Regression parameters of only five volume models were significant at 0.05 for all the two species.
- Intervention effect Including variable D0 in volume equations gives an insignificant improvement of the Ra2 values.
- Intervention effect Replacing the Ht variable with Hb gives a quite significant improvement of the Ra2 values.
- Observation VOL-23, VOL-25 to VOL-29, VOL-30 and VOL-31 were the best volume models for almost all the two species.
- Recommendation Care should be taken when applying the same model to the same species across varying growth and management conditions.