Modeling the diameter distribution of gymnosperm species from central karakoram national park, gilgit baltistan, and Pakistan using weibull function
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2014, Vol 4, Issue 7
Abstract
This investigation focuses on modeling the tree diameter distribution using Weibull function of three gymnosperm species, i.e. Picea smithiana, Pinus wallichiana and Juniperus excelsa dominating the forests of Central Karakoram National Park, Gilgit-Baltistan. Various workers have attempted to model the population structure of trees in their respective study areas. A number of probability distributions have been employed to find a good fit to the observed distributions. A number of recent studies have indicated the three parameter Weibull distribution as a possible model for describing the size class structure of trees. Thus, the Weibull model was selected to describe the diameter distribution of the three conifer tree species under study. The parameters for each tree distribution were estimated by a program CumFreq that employs the maximum likelihood method. The cumulative distributions of each tree species were tested against the fitted distribution. In all cases the Weibull distribution gave excellent fit to the observed data as indicated by high efficiency coefficient R. The result showed that the tested gymnosperm species are deteriorating due to anthropogenic disturbance. The lack of recruitments alarming for future sustainability of these forests. The possible implications of these models in the management of the respective forests are discussed.
Authors and Affiliations
Alamdar Hussain, S. S. Shaukat, Moinuddin Ahmed, Muahammad Akbar , Wajid Ali, Haleem Zaman Magsi
Keywords
Related Articles
- EP ID EP37797
- DOI -
- Views 135
- Downloads 0
Locating flood spreading suitable sites for groundwater recharging through Multi Criteria modeling in GIS (Case study: Omidieh-Khuzestan)
Use of geographic Information systems (GIS) to determine the suitable potential sites for flood spreading is not possible without using decision making systems. The aim of determining flood spreading suitable sites is...
Details on the morphological characteristics of marine copepods, Copilia mirabilis, Sapphirina stellata and Macrosetella gracilis, in Iligan and Sarangani bays, Mindanao, southern Philippines
Copilia mirabilis, Sapphirina stellata and Macrosetella gracilis belonging to Families Sapphirinidae and Miraciidae, respectively, were described in detail. Specific morphological characters such as body segmentation, nu...
Synthesis of biopolymer based on H-alginate-graft-poly (sodium acrylate-co-acrylamide)/MMT composite hydrogels
In this research, we synthesized a novel alginate-based composite hydrogel via graft copolymerization of mixtures of acrylic acid(AA) and acrylamide (AAm) onto alginate backbones in the presence clay powder. The composi...
Seasonal Change of Community Structure and Abundance of phytoplankton in Roudan River
A combination of environmental conditions affects the phytoplankton distribution and composition. This study analysed spatio-seasonal variation of phytoplankton in relationship to environmental variables in Roudan River...
Vegetation Ecology in China- A review
China being third country in extensive biodiversity is the home of almost all types of ecosystems. Grasslands and forests are major source of carbon. Ecosystem services in China contribute 2.71% to that of world. But du...