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Author A. Khadka |
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Add the result to your basket Make a suggestion Refine your search Apply to external sourcesDiameter-height models for the Terai tree species / A. Khadka in BANKO JANAKARI - वनको जानकारी : A Journal of Forestry Information for Nepal, 25: 1 (May 2015)
Title : Diameter-height models for the Terai tree species Material Type: printed text Authors: A. Khadka, Author ; T. Subedi, Author ; M. Ghimire, Author ; B. P. Dhakal, Author ; P. Parikka, Author Publication Date: 2015 Article on page: 50-54 p. Languages : English (eng) Keywords: Growth, model, non-linear mixed effects, yield Abstract: Tree diameter-height relationship can be used as a key input component in forest growth and yield models, and description of stand dynamics. Various models of stem diameter and height relation were developed. Those were formulated and implemented during Terai forest inventory data calculations in the Forest Resource Assessment (FRA) Nepal Project. The field inventory was conducted from December, 2010 to March, 2011. The Concentric Circular Sample Plot was designed where the diameters at breast height of all the tallied trees and the heights of the sampled trees were measured. The data were handled with R-script in R Programme to generate non-linear mixed effects models in ‘lmfor’ package of forest biometrics functions of Mehtatalo. Different non-linear models were used to fit the diameter-height relation, which performed well in describing the relationships between the diameters and the heights of the Terai tree species depending on the sample size. The models were selected as the best fitted based on the statistical results such as standard error, Adjusted R2, RMSE and residuals. The best models for Shorea robusta and Terminalia alata were generated using Wykoff’s and Naslund’s functions, respectively. Link for e-copy: http://lib.frtc.gov.np/elibrary/?r=591
in BANKO JANAKARI - वनको जानकारी : A Journal of Forestry Information for Nepal > 25: 1 (May 2015) . - 50-54 p.[article] Diameter-height models for the Terai tree species [printed text] / A. Khadka, Author ; T. Subedi, Author ; M. Ghimire, Author ; B. P. Dhakal, Author ; P. Parikka, Author . - 2015 . - 50-54 p.
Languages : English (eng)
in BANKO JANAKARI - वनको जानकारी : A Journal of Forestry Information for Nepal > 25: 1 (May 2015) . - 50-54 p.
Keywords: Growth, model, non-linear mixed effects, yield Abstract: Tree diameter-height relationship can be used as a key input component in forest growth and yield models, and description of stand dynamics. Various models of stem diameter and height relation were developed. Those were formulated and implemented during Terai forest inventory data calculations in the Forest Resource Assessment (FRA) Nepal Project. The field inventory was conducted from December, 2010 to March, 2011. The Concentric Circular Sample Plot was designed where the diameters at breast height of all the tallied trees and the heights of the sampled trees were measured. The data were handled with R-script in R Programme to generate non-linear mixed effects models in ‘lmfor’ package of forest biometrics functions of Mehtatalo. Different non-linear models were used to fit the diameter-height relation, which performed well in describing the relationships between the diameters and the heights of the Terai tree species depending on the sample size. The models were selected as the best fitted based on the statistical results such as standard error, Adjusted R2, RMSE and residuals. The best models for Shorea robusta and Terminalia alata were generated using Wykoff’s and Naslund’s functions, respectively. Link for e-copy: http://lib.frtc.gov.np/elibrary/?r=591
Title : Mapping deforestation and forest degradation using CLASlite approach in Eastern Churia of Nepal Material Type: printed text Authors: S. Khanal, Author ; A. Khadka, Author Publication Date: 2016 Article on page: 17-23 p. Languages : English (eng) Keywords: Churia, CLASlite, deforestation, forest degradation, spectral mixtureanalysis Abstract: Monitoring deforestation and forest degradation is essential for forest conservation
and sustainable management. Those activities have become more relevant in order
to get reference emission level required for Reducing emissions from deforestation
and forest degradation (REDD) initiative. The study aimed to assess forest
degradation and deforestation in the Churia region of Eastern Nepal using CLASlite
approach. This approach is based on Spectral Mixture Analysis and provides
highly automated technique for forest cover, deforestation and forest degradation
mapping. The Landsat imageries of 2002 and 2013 were processed for estimation
of deforestation and forest degradation. The validation of results based on the
high-resolution multi-temporal Google Earth imageries and the field sample plots
indicated that CLASlite approach could be feasible approach to monitor forests for
deforestation and degradation. The results can be further improved by including
more frequent time-series observation from Landsat.Link for e-copy: http://lib.frtc.gov.np/elibrary/?r=574
in BANKO JANAKARI - वनको जानकारी : A Journal of Forestry Information for Nepal > 26: 1 (2016) . - 17-23 p.[article] Mapping deforestation and forest degradation using CLASlite approach in Eastern Churia of Nepal [printed text] / S. Khanal, Author ; A. Khadka, Author . - 2016 . - 17-23 p.
Languages : English (eng)
in BANKO JANAKARI - वनको जानकारी : A Journal of Forestry Information for Nepal > 26: 1 (2016) . - 17-23 p.
Keywords: Churia, CLASlite, deforestation, forest degradation, spectral mixtureanalysis Abstract: Monitoring deforestation and forest degradation is essential for forest conservation
and sustainable management. Those activities have become more relevant in order
to get reference emission level required for Reducing emissions from deforestation
and forest degradation (REDD) initiative. The study aimed to assess forest
degradation and deforestation in the Churia region of Eastern Nepal using CLASlite
approach. This approach is based on Spectral Mixture Analysis and provides
highly automated technique for forest cover, deforestation and forest degradation
mapping. The Landsat imageries of 2002 and 2013 were processed for estimation
of deforestation and forest degradation. The validation of results based on the
high-resolution multi-temporal Google Earth imageries and the field sample plots
indicated that CLASlite approach could be feasible approach to monitor forests for
deforestation and degradation. The results can be further improved by including
more frequent time-series observation from Landsat.Link for e-copy: http://lib.frtc.gov.np/elibrary/?r=574
