Dissertation > Excellent graduate degree dissertation topics show

Analysis on the Timber Assortment and Growth-yield Model of Prediction for Natural Broad-leaved Forests in North Fujian

Author: LiXiaoJing
Tutor: JiangXiZuo
School: Fujian Agriculture and Forestry University
Course: Forest Management
Keywords: natural broad-leaved forest timber assortment structure growth model biomass assets valuation immune evolutionanry algoruthm ant colony algorithm volume table selective cutting income method
CLC: S758.5
Type: PhD thesis
Year: 2013
Downloads: 20
Quote: 0
Read: Download Dissertation

Abstract


The paper taked the natural broad-leaved forest in North-Fujian as the research object, with the data of provincial forest resource inventory by the150fixed sample plots,1823sample trees made materials data,69sample plots and128biomass sample trees, using the statistical software SPSS operation platform, by the theory and technology method of forest mensuration, forest management, forest resource asset evaluation method etc., the paper analysised the law of the timber assortment structure, the merchantable volume model, the whole stand growth-yield models, biomass estimation model, shrub and herbal biomass model, also including the growth-yield model with the interval.Meanwhile, the paper also analyzed the application of assets evalution of the natural broad-leaved forest and discussed the change of the asset assessment under the different circumstances. It had the important practical value on dynamic monitoring of forest resources, management, assets evaluation and the calculation of carbon reserves measures in the north Fujian province. The main research content and summary are as follows:(1) Using the sample timbers on the spot which analysed the law of diameter grade timber assortment structure, On this basis, the paper chose the proper equation which builded the volume ratio model of timber assortment and compiled the two dimension merchantable volume yielding volume rate tables. In order to facilitate the production and application, after that the tree height curve model was been established, the one dimension merchantable volume yielding volume rate tables had been exported by the two dimension merchantable volume yielding volume rate tables.Analysing the plant timber assortment structure rules by the related data, the paper taked the stand average diameter and average height as the auxiliary variables, and employed the joint estimation method which used to solve the volume model incompatible.Meanwhile, the stand of volume ratio model was constructed by using the immune evolutionanry algorithm to calculate the model parameter.Through tested, the volume ratio model had been higher precion and had practical value in forestry production.The paper discussed technical method for fomating the stand of volume ratio table by application of the tape equation, Weibull distubition function, the relative tree height curve model, and some other auxiliary equation.(2)Using the sample data, the stand growth model was been established and then the forecast method was put forwarded. Considering the difffrenence of site class which would be effected the result, the research putted the site classes dividing into four grades. Taked the rank as the dummy variable, the site class index model was conctructed. The whole stand model of the Volume model, the basal area model, the average breast height-diameter and the average height etc. including the natural sparse model which was inferred could be brought about continuous prediction and dynamic updating for natural broad-leaved forest resources.(3)Using the joint estimation to solve the problem that the biomass models of each compoents was not compatiable, the immune evolutionanry algorithm had been used for the model parameters.the model estimation of tree biomass, the understory shrubs, herbaceous biomass models in North-Fujian province were constructed and the tree biomass table were drew up.(4) The technology building natural uneven-aged forest growth model by using the prediction interval instead of the stand age were established. Considering the difffrenence of the site class that would be effected the result, the stand growth and yield model taken the interval as the main auxiliary factor were established throught incorporating the dummy variable including the site quality variable, and to estimate the model parameters by the ant colony algorithm, what provided a new technical approach for formatting the natural uneven aged forest growth and yield prediction model.It offered technical support to establish the model of natural uneven age forest by the prediction interval instead of stand age for application of natural broad-leaved forest assets evaluation selection cutting income method.On the basis, the assessment technique for the assets of natural broad-leaved forest were be discussed, and also analyzed the impact for the forest assets valuation by the change of selective cutting intensity and the rate, which can be improved the asset assessment for forest resources, especially provided the theoretical basis for the accuracy of natural uneven aged forest asset assessment.

Related Dissertations

  1. Effectiveness Evaluation on the Jointed Combat of the Multiple Missiles and Research on Combinatorial Optimization Algorithm,TJ760.1
  2. Reseach on Optimal Control of Elevator Group Based upon Ant Colony Algorithm,TU857
  3. Numerical Simulation of Biomass Direct Reburning,TK16
  4. Experimentation Research for Deoxidize Reaction Process of NO_X Adopt Different Reburnning Fuels,TK227.1
  5. Study of Updraft Biomass Air Gasification and Tar-Reducing Technology,TK6
  6. Improvement of Ant Colony Algorithmand Its Application in Robot Path Planning,TP242
  7. Study on Tolerance of Five Species of Garden Flower to Copper Stress,S68
  8. Growth Rate and Growth Model of the F5 Selected Lines for Four Shell Colors of Pinctada Martensii (Dunker) Cultured in Deepwater Area of Beibu Bay in Zhanjiang and Their Genetic Diversity Analysis Using SSR Molecular Markers,S968.31
  9. Design and Study on Absorption Plant of Sulfur Dioxide from Flue Gases,X701.3
  10. Preparation of the Crop Stalk-Based Shaped Activated Carbons and Fibreboard,X712
  11. Research on Improved Ant Colony Optimization and Its Application in TSP,TP301.6
  12. Study on Biomass Energy Production Utilization Model Based on Circular Economy,S216
  13. Influence of Biochar Amendments on Decomposition of Soil Organic Carbon and Morphology of Heavy Metal in Red Paddy Soil,S153.6
  14. Study of "Solid -air - Liquid" Cogeneration and Product Application in Biomass Energy Conversion Process,S216
  15. Effects of Three Aquatic Plants on Soil Properties and Depletion of Rhizosphorus Nitrogen and Phosphorus,S154.4
  16. Study on Modeling Effects of Genotype and Sowing Date on Rice Prductivity,S511
  17. Effect of Iron, Manganese and Other Microelements on Growth and Effective Ingredients of Salviae Miltiorrhizae Bunge,S567.53
  18. Effect on Nitrogen Use Efficiency and Ammonia Volatilization of Cotton (Gossypium hirsutum L.) by Different Nitrogen Applicatons,S562
  19. Modeling Genotype by Climate Effect on Wheat Prductivity,S512.1
  20. Research on Biological Productivity and Characteristics of Soil Nutrients of Main Tree Species for Shelterbelt in Haitan Island,S727.2
  21. Remote Sensing Research of Pinus Massoniana Biomass in Ecological Environment of Soil and Water Loss,S791.248

CLC: > Agricultural Sciences > Forestry > Forest management,forest measurement science, forest management > Forest measurement science ( measuring tree learning ) > Stand determination
© 2012 www.DissertationTopic.Net  Mobile