摘要
采用被视频度、林型权重、被视可能性 ,对富阳市富春江两岸风景森林进行计量评价 ,为两岸风景防护林的配置、管理提供正确的决策。通过地形及土地利用图、数值地形模型和视线入射角来确定景观的被视频度 ;引进人口重力模型来表示森林的被视可能性 ;采取一对一比较法判断林型权重 ;利用 Thurstone的比较判断矩阵得到各景观的评价值。通过使用林型权重 ,可判断景区森林布局的合理性 ,而评价值 (Li)的高低可作为森林景观是否需要改造的标志值。研究表明 ,景观的评价值 (Li)受被视可能性 (Gi)和林型权重 (Vi)的影响。景观评价值最高的为杨树苏柳银芽柳条带状混交林、杨树香椿枫香复层林两种木森林类型 ,其次为杨树河柳林带、杨柳枫杨桤木香樟块状混交林、桤木纯林、杨树纸浆林、柳树纸浆林、街道公园绿化带、枫杨纯林、桑树。森林是以小班为单位经营管理的 ,植被、林龄等在同一小班内基本一致 ,森林风景管理也至少要求对每个小班进行评价 ,因此 ,研究时网格大小起码在小班内含有几个网格 ,最适大小为 5 0 m× 5 0 m。
To objectively evaluate the scenic function of forest is one of the main concerned subjects in forestry studies at present. The frequency degree of being visualized, the weight value of vegetation type and the possibility of being visualized were used in quantitatively evaluating forests of Fuchun river beaches in Fuyang, for the decision-making in configuration of tree species and forest management. The frequency degree of being visualized was determined by using the land utilization map, numerical model of topography and the incident angle of sight. The possibility of being visualized was represented by a population gravity model. The weight of the vegetation type was determined by a one-to-one comparison method. And the evaluation value of each landscape was gained by Thurstone Comparison and Judgement Matrix. The rationality of the forest composition can be evaluated by using the weight value of vegetation type, meanwhile, evaluation value (Li) can be regarded as an indicator in determining whether the landscape needs to be transformed or not.The study result showed that the evaluation value of landscape (Li) was influenced by the possibility of being visualized and the weight of the vegetation type. The highest evaluation values were found in mixed forest of Poplar,Salix×jiangsuensis,Salix×agyrobractealis, and Multi-storied forest of Poplar,Toons sinensis,Liquidambar formosna, followed by the forest belt of Poplar×Abies chensiensis,Patch-mixed forest of Poplar×willow×Pterocarya stenoptera DC×alder×Toons sinensis,Pure forest of alder,Abstract: is ed several grids, the opahe zone included several grids, Pulp stands of poplar,Pulp stands of willow,Green belt of street and park,Pure forest of Pterocarya stenoptera DC,Mulberry. Forest plot is the forestry managerial unit, in which the vegetation type and the tree age are similar. The forest scenic evaluation at least can be implemented in each forest plot. Several grids can be selected within each evaluated forest plot for study, and the optimal size of gr
出处
《生态学报》
CAS
CSCD
北大核心
2005年第3期615-620,共6页
Acta Ecologica Sinica
基金
浙江省"九五"科技重大资助项目 (962 10 3 0 5 0 )~~
