北京市朝阳区景观连接度距离阈值研究

景观连接度方法是一种进行景观生态安全格局定量化评价的较好方法。此方法的应用中,景观连接度适宜距离阈值是一个关键因素,以北京市朝阳区为例对其展开研究。选取景观组分数(NC)、整体连接度指数(ⅡC)以及可能连接度指数(PC)来表征景观连接度以及计算斑块重要性值(dI);预设9个距离阈值,探讨不同距离阈值下景观连接度和斑块重要性值的变化规律。结果表明:北京市朝阳区景观连接度的距离阈值以400～600 m为宜。在此距离阈值的约束下分析表明,小型生态斑块对提高区域景观连接度有重要作用。

Research on Distance Thresholds of Landscape Connectivity in Chaoyang District of Beijing

Landscape connectivity method is a better way of quantitative evaluation for a landscape eco-logical security pattern. In the application of this method, the appropriate distance thresholds of land-scape connectivity is a key factor, in this paper, Chaoyang District, Beijing, for example to study it. Se-lecting Number of Components （ NC）, Integral Index of Connectivity （ ⅡC）, and Probability of Connec-tivity （PC） to characterize the landscape connectivity and calculate the plaque importance of the value （dI）; Setting the nine distance thresholds to investigate the variation of landscape connectivity and plaque importance of values in different distance thresholds. The results shows that it is appropriate for Chaoyang District＇ s landscape connectivity from the threshold in the 400～600 m In the constraints of this distance threshold, analysis shows that small ecological plaque plays an important role in improving the regional landscape connectivity.