Year: 2012
Type: dissertation
Abstract: Investigation for spatial continuity in tree diameter distribution is attempted. \nParametric and non-parametric approaches are employed to see whether tree diameter \ndistribution acts as regionalized variable or not. Tree diameter at breast height (dbh) \nwith size five ems or greater is recorded in circular plot along with the relative geo \nreferenced co-ordinates of the plot center at compartment level. For the parametric \napproach, truncated two parameter Weibull distribution is found best fit for plot data \nand that an overlook of truncated data may result in wrong inference. From the \ntruncated Weibull distribution, the maximum likelihood scale and shape parameter \nestimates of each plot data is obtained. Consequently, both parameter estimates, as \nattributes of tree dbh distribution, are subjected to spatial variation study usmg \nomnidirectional semivariogram and associated models at compartment level. \nComputation of cumulative distribution function of dbh at selected cutoff ( cdf) in the \nplots is followed by investigation for spatial continuity in the non-parametric case. The \nspatial continuity study of the number of stems per hectare greater or equal to the \nselected cutoff is also considered. \nThe variograms and cross validation study of the Weibull parameter estimates, cdf and \nnumber of stems as attributes of tree dbh distribution seem to be very indicative to \nsuggest that tree diameter distribution exhibits spatial continuity in the same fashion to \nregionalized variable.
Author: Leakemariam Berhe
Language: English
Subfield: Forestry
Domain: Life Sciences
SDG: Life on land
Open Access status: green
OpenAlex ID: W26709629