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Optimization on Spatial Distribution of Coastal Protective Forests in Dongshan Island Based on 3S Technology

Author: LiangYi
Tutor: YouShuiSheng；YeGongFu
School: Fujian Agriculture and Forestry University
Course: Ecology
Keywords: Coastal shelterbelt 3S technology Space allocation Mode filter Dongshan Island
CLC: S727.2
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract

Coastal shelterbelt system is an important content of China's ecological construction, is also an important part of the coastal areas of disaster prevention and mitigation system. Coastal areas due to its special geographical location and location advantages has an important position and role in the national development global. Speed ??up the construction of coastal shelterbelts, build efficient and reasonable coastal shelterbelt system ecological barrier to enhanced coastal areas against natural disasters, China's ecological construction as a whole is a very urgent strategic task. This study the Dongshan Island severe wind damage, land salinization and desertification and other key regional environmental problems, according to the shelter forest system in the area to create technology needs and natural geographic, economic, and social conditions the the Dongshan Island shelterbelt system for the study, the use of shelterbelts science landscape ecology theory, methods and techniques, through field survey, supporting the underlying survey data, the use of remote sensing images of the different periods of the study area, extract the spatial and temporal distribution of thematic information of Dongshan Island coastal shelterbelt, for different periods of protection forest functional changes and problems, optimal adjustment of the depth shelter forest, the establishment of evaluation index system the optimal of major configuration mode under the conditions of the overall efficiency of the highest proportion. Shelterbelt system space in the study area on the basis of the analysis of the existing main protective forest species and forest belt status quo, the use of geographic information systems (GIS) configuration conduct research to improve the island's ability to resist the ecological risk for local economic and social development a relatively stable ecological environment, shelterbelt function to maximize play. The content and conclusions of the research are as follows: (1) for the topographic characteristics of the study area, Dongshan Island 2001,2004,2007 three remote sensing images using decision tree classification, supervision combination of classification and hierarchical classification method for object classification and achieved good results, three phase classification accuracy above 80%, Kappa coefficient greater than 0.8. Remote sensing information source for remote sensing thematic classification, can significantly improve the classification results. (2) the establishment of a remote sensing image classification system as the main research object to Dongshan Island coastal shelterbelts, superimposed using classification methods, analysis of the 2001-2007 Dongshan Island land-use change in the overall situation. The results show that, the Dongshan Island type of land-use change in the overall trend: residential and arable land decreased, which is the most dramatic changes of cultivated land position. Woodland and water area increased, including changes in woodland, waters, followed by. The sandy area remained basically unchanged. Dongshan Island land use change simulation predictions, you can see, if the development of the evolution of trends in 2004-2007, about 2040 Dongshan Island land use structure to achieve the stable state. (3) Fujian Dongshan Island sandy coastal shelterbelt system the plant communities of the different levels of shelterbelt mode filter, analyze and summarize the results of previous studies based on the use of the Analytic Hierarchy Process and expert scoring method for qualitative analysis and quantitative evaluation. Get a comprehensive evaluation of the different plant community pattern score value, to provide a reference for the sandy coastal plant communities configuration. (4) The average individual volume in the forest belt maturity of the protection a shelterbelt forest of high, forest bandwidth shelterbelt spacing shelterbelt ventilate coefficient, wind speed weakened coefficient, shelterbelt average individual nutrition is selected on the basis of analysis of the the shelterbelt system space optimal allocation theory area and spacing configuration indicators, the use of GIS spatial analysis techniques to study of Dongshan Island shelterbelts space configuration, will be the shelterbelts divided into three configurations, respectively, the statistics of the area after the different levels shelternets configuration and forest coverage, The results showed that: a Network, two shelterbelts, the three shelternets share coverage reached 2.16%, 1.58%, 2.34%. Optimal allocation through intensive forest coverage has increased significantly. The method takes into account not only the configuration Shelter benefit, still reasonable windbreak structure configuration within the plan, according to local conditions, to determine the of Dongshan Island different types of coastal shelterbelt space allocation for the regional coastal shelterbelt space configuration reference. (5) to adhere to the principle of protection of the status quo ante, in the the conditional coast with cutting-edge to create a wave dissipation forest belt, constructed by the the wave dissipation forest, the backbone forest belt, the depth of shelter forest, walled village forest, towns and villages green shelterbelts woodlots forest belts and woodlots constitute Dongshan Island shelter forest system in the use of geographic information systems (GIS) on Dongshan Island shelterbelt system space configuration study, and generates configuration diagram.

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CLC: > Agricultural Sciences > Forestry > Silviculture, tree breeding and afforestation techniques > Tree species, various types of special areas of afforestation > Shelterbelts
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