玉环县沿海防护林景观格局及其高程响应分析

Landscape Pattern and Its Elevation Response of Coastal Shelterbelt Forest in Yuhuan County,Zhejiang

以SPOT5遥感影像为数据源,运用景观生态学原理和方法,在RS和GIS技术支持下,从景观总体特征、沿海防护林景观格局及其高程响应规律3个方面入手,将浙江省玉环县海防林景观划分10个景观类型(7个一级景观,3个二级景观)进行分析评价。研究结论如下:(1)玉环县海防林景观整体上异质性较强,景观结构不合理,针叶林比例过大,阔叶林与混交林偏少;(2)研究区景观随高程分异变化显著,整体上呈现出随高程上升,斑块面积变大、形状趋于规则、破碎度减弱、团聚性和连通性增强的规律;(3)人类活动以及城镇化进程是研究区景观异质性变化的主要驱动力因子;(4)台风等自然灾害对景观异质性增强起着重要作用。

With the support of RS and GIS technology,the landscape in Yuhuan County of Zhejiang was divided into 10 types based on the analysis to the overall characteristics of landscape,the landscape pattern of coastal shelterbelt and its response to elevation change,with SPOT5 remote sensing imagery as the data source.The landscape in Yuhuan was highly heterogeneous,with a disproportionate structure for forest landscape.The coniferous forests took the majority in the total area,while the broadleaved forest and mixed forest occupied a low proportion.With the change of elevation,the landscape exhibited notable differentiation.As the altitude increased,the patch tended to increase in size,and more regularly shaped.The aggregation and connectivity tended to increase and fragmentation to decrease.We concluded that the human activity and urbanization process were the primary drivers in landscape heterogeneity variations,and the typhoon played an important role in landscape heterogeneity incensement.