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Forest Health Assessment at Stand Scale

Author: WangZhongChun
Tutor: KangXinGang
School: Beijing Forestry University
Course: Forest Management
Keywords: Health assessment Index system Forest species Fuzzy Evaluation
CLC: S757.4
Type: Master's thesis
Year: 2010
Downloads: 189
Quote: 11
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Abstract


The study to Jingouling Changbai Mountain forest into forest health evaluation of the object , based on the structure determines function theory , put forward different kinds of forest stand structure their health status . Sub- forest species of the eight forest types , forest health research . Constructed from three aspects of productivity , stability and ecological functions of forest classification includes nine indicators and 10 sub- indicators of forest health assessment index system . The index system and strive to be able to fully reflect the natural condition of the stand , and at the same time most of the indicators data can be obtained from the Forest Resource Inventory index system has strong applicability . In this paper, the delineation of the standard indicators using the normal equidistant analysis and the average method . Standard division of the volume of the unit area , fully taking into account the different standards in different forest types , and then sub- forest type indicators standard division . Re - assignment of different forest species indicators right criteria layer of different forest species of the right weight control , consulting experts on the basis of the application of AHP ultimately determine the index weights . In this study, the method of fuzzy membership discrimination in the membership of the small class , namely the right to re - maximum method to determine the small-class health membership . Forest health status of the region on the basis of the study area stand divided forest species that forest health evaluation , obtained as follows: (1 ) health assessment of different forest stands can be drawn from coniferous stand area of the forest in the quality and the health status of its own total ratio greater than coniferous forest and broadleaf forest . The proportion of the total area of the three stand in the quality and health status were 44.6% , 15.4% and 14.9% . Stand area ratio greater than artificial Chunlin artificial mixed forest plantations in the quality and health status . ( 2) the overall Jingouling timber in a healthy condition , 8327.5 hm2 in area , accounting for 56.4% of the the timber total area being evaluated . Overall Jingouling shelterbelts in a healthy state , 568.8 hm2 in area , accounting for 66.3% of the total area of the assessment shelterbelts . The timber stand tending to reach a reasonable stand structure must be strengthened to maximize the economic benefits .

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CLC: > Agricultural Sciences > Forestry > Forest management,forest measurement science, forest management > Forest Management > Forest planning, forest design
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