基于GIS与灰关联综合评价模型的生态公益林林分质量评价

文章研究探讨了地理信息系统(GIS)技术与层次分析模型和灰关联综合评价模型的结合在生态公益林林分质量评价中的应用。并以广州市白云区为例,应用ArcGIS进行空间数据采取、处理与分析,选取树种组成、林分郁闭度、林层结构、林龄、覆盖度、凋落物层厚度和平均胸径为评价指标;以小班为评价单元;采用层次分析法确定评价因素的权重;构造灰关联综合评价模型,计算各单元的灰关联综合评价值,得出各单元按质量从劣到优排列的序列,根据评价标准将林分质量分为一、二、三等,分别占全区生态公益林总面积的6.19%,28.52%和65.29%;并应用ArcGIS绘制评价结果图。

Evaluation of Ecological Forest Stand Quality Based on Geographic Information stem and Gray Relative Comprehensive Evaluation Model

This research was conducted at Baiyun district,which located in Guangzhou,Guangdong province.Based on the technique of Geographic Information System and mathematic models ecological forest stand quality evaluation was discussed.ArcGIS was adopted for spatial data collection,processing and analysis.After those indexes including treespecies composition,stand canopy density,stand structure,stand age,undergrowth coverage,litter thickness and mean breast-height diameter selected,AHP was applied to judge the weight of each evaluation factor.Taking subcompartment as evaluation unit,gray relative comprehension evaluation model was given to work out value of gray relative comprehensive evaluation of each evaluation unit.With the indexes of gray relative comprehensive evaluation,the ecological forest quality was classified into three grades.The areas of the first grade,second grade and third grade accounted for 6.19%,28.52% and 65.29% respectively.Stand quality evaluation result was mapped using Arc GIS software.