| Degree of landscape fragmentation plays an important influence on the ecological benefits of forest ecosystems. For spatial planning of woodland, it is particularly essential to assess the role of the proposed woodland plan in improving forest landscape fragmentation. Landscape connectivity is one of the indicators to assess the importance of proposed planning woodland for improving forest ecological benefit. According to the natural properties and conditions of the woodland, combined the landscape connectivity and woodland quality grade to access woodland comprehensive evaluation of quality level is conducive to utilize the potential of woodland. It is help for tree planting in suitable conditions, implementing forest management and utilization model according to the corresponding woodland quality grade and scientifically guide forest management to achieve woodland ecological and economic benefits, and also provide a reference for woodland spatial planning.The study area of this paper is Nanbu county of Sichuan province. In this paper, forest quality level factors and landscape connectivity were analyzed and extracted by GIS technology using high resolution images (SPOT-5) and forest inventory information as the data source. According to the forestry division layout, rational decision-making model was adopted, so as to provide a scientific basis and technical support for the scientific spatial planning of woodland. The main conclusions are as follows:(1) Based on GIS spatial analysis, analyzing and calculating woodland spatial connectivity by selecting100m field threshold value, the results showed that the polygons with forest spatial connectivity less than0.1and above0.9were dominated, which means a clear differentiation.(2) Through terrain analysis using DEM, slope, aspect and slope position which effected the woodland quality were extracted. The slope and aspect factors can be calculated by spatial analysis function module of ArcGIS software and the slope position were Extracting by Topographic Position Index (TPI) method. After many trials selected a different threshold and compared with the actual terrain funded that:select the circular neighborhood and take the TPI value of the neighborhood radius of100pixels can be better reflected the information of the slope position in the study area(3) The study area is divided by the differences of ecological functions and forest productivity. According to the regional ecological needs and demand for forest products, three sub-regions were divided. They were Shengzhong Reservoir water conservation forest dominant functional area and West Stream of Jialingjiang soil and water conservation forest dominant functional area which based on ecological value, as well as the Southwest timber production forest dominant functional area which based on economic benefit. Correspondingly, all these sub-regions were planned by evaluation factors which assigned different weight value. The program can achieve the forest ecosystems and environmental benefits of the woodland, take into account the local demand for forest products, and optimize the spatial layout to maximize the ecological environment and the social economic benefits.(4) Comparative analyzing of the planning results, the planning under different weights of woodland landscape connectivity and woodland quality grade corresponding different area is better than the stochastic planning which just considers woodland quality grade. The planning which integrated woodland landscape connectivity and woodland quality grade can reduce the woodland landscape fragmentation of ecological function zones, improve the comprehensive ecological benefits of woodland and protect biodiversity. For timber forest functional area, improve social and economic benefits while taking into account the ecological functions to improve forest productivity.In conclusion, based on the framework of overall planning objectives and regional planning of the study area, this paper planned and evaluated the study area by integrating the woodland quality grade, woodland spatial connectivity and geographical conditions, which has certain reference significance for carrying out the actual woodland conservation and utilization planning. |
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