Allometric Equation For Biomass Estimation Of Allophylus Abyssinicus Radlk. And Croton Macrostachyus Del. In Arba Gugu

The Development Of Tree Allometric Equations Is Crucial For Accurate Forest Biomass And CarbonrnAssessment. However, Very Few Allometric Equations Have Been Developed In Ethiopia And As A ResultrnGeneralized Allometric Equations, Often Established For Forests In Other Study Areas, Are Used ByrnDefault. The Objective Of This Study Was To Develop Allometric Equations For Allophylus AbyssinicusrnAnd Croton Macrostachyus In Arba Gugu Natural Forest Ethiopia. Trees Were Climbed, BasalrnDiameters Of Small Branches Were Recorded And Four Branches Per Tree Were Removed For FurtherrnMeasurement. The Sampled Branches Were Used To Develop Allometric Equations Predicting BranchrnDry Biomass, From Oven Dried Branch Biomass At 105°C And From Their Branch Basal Diameter (PicardrnEt.Al., 2012), Then Models Were Developed To Predict Biomass Of The Trees Based On Climber’s SerialrnVolume Measurements Of Sections Of Trunks And Big Branches And Mean Wood Density Obtained FromrnSmall Trimmed Wood Branches. The Mean Wood Density Of The Trimmed Branches For The AllophylusrnAbyssinicus And Croton Macrostachyus Resulted In 0.32 G Cm-3 And 0.255 G Cm-3 Respectively For ThernTwo Tree Species. Then, Using The Volume Of Each Section And Mean Branch Wood Density The DryrnBiomass Of The Trees Were Estimated. Regression Analysis Was Used To Estimate The Above GroundrnBiomass (AGB) To Do This R-Statistical Software Was Used For The Analysis Of The Models. IndependentrnVariables Ranging From One To Three Were Used To Estimate The AGB The Dependent Variable: Model-7rnAGB 19.81 0.1261(Dbh) 1.373(H) 0.0003345(V) Was The Best Performing Model For AllophylusrnAbyssinicus With R2 0.88, R2 0.85 And Significant P- Value Of 2.9x10-16 And With AnrnAverage Deviation S% 13%.The Best Performing Model For Croton Macrostachyus Was: Model-8rnAGB 0.06842 0.001114(Dbh) 0.05759(H)0.0002579(V) With R2 0.99 And Also Adjusted R2 0.99rnAnd Significant P-Value Of 7.10x10-5 And With Average Deviation S% 5%. The Application Of ThernModels Should Be Taken With Caution As The Models Have Varying Reliability And Precision, ImplyingrnThe Application Of Models For Decision Making Needs To Consider Their Reliability And Precision.rnKeywords: Semi-Destructive Biomass Estimation; Allophylus Abyssinicus Radlk.; CrotonrnMacrostachyus Del.; Allometry; Species Specific

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