不同建筑密度下城市森林景观逆破碎化趋势

基于Quick Bird卫星影像和地理信息系统,对不同建筑密度城市森林覆盖率梯度下景观破碎化趋势的响应进行了分析。结果表明,城市森林景观破碎化状态受建筑物密度的影响较大。建筑物密集区是城市森林景观破碎化的敏感区域,建筑物密集区城市森林景观破碎化程度较高,随森林覆盖率的升高呈现波动性状态响应,森林覆盖率10%～15%是密集区城市森林景观指数的波动区段,建筑物非密集区城市森林景观破碎化状态随森林覆盖率的增加呈现稳定的下降趋势,森林覆盖率20%～30%是非密集区城市森林景观指数的急剧变化区域。

Landscape Defragmentation Trends of Urban Forests under Different Building Densities

Based on Quick Bird images and geographic informational system,responses of landscape fragmentation trend to the urban building density and gradients of urban forest coverage were analyzed.The results showed that landscape fragmentation status of urban forests was distinctly influenced by urban building density.Dense urban areas were sensitive regions with high level of landscape fragmentation of urban forest.It undulately responded to the increase of urban forest coverage.Ten to fifteen per cent of forest coverage was the undulating range of landscape indices of urban forest.Landscape fragmentation of urban forest in less dense area decreased steadily with the increase of forest coverage.Twenty to thirty per cent of forest coverage was rapidly changing range of landscape indices of urban forest.The trend of landscape defragmentation of urban forest was preliminarily probed under the variation of landscape fragmentation.