基于道路网络特征的建设用地扩张及其对林地景观的影响——以深圳市为例

道路作为景观廊道,与建设用地景观、林地景观之间存在着复杂的生态学联系。在道路网络迅猛扩展的同时,深圳市建设用地迅速扩张,并对林地景观产生了一定影响。基于土地利用变更调查数据,对1996-2008年快速城市化地区深圳市道路密度与建设用地扩张强度、道路密度与建设用地-林地边界动态的相互关系进行了研究。结果表明,建设用地规模与道路密度、建设用地扩张强度与道路拓展强度呈相关关系,道路网络对城市的社会经济发展有着重要的支撑能力。另一方面,研究期间深圳市林地退化严重,与建设用地接触的单个林地斑块的平均边界长度（林建边界长度）增加,建设用地-林地边界呈现出复杂化的趋势。林建边界长度与道路密度成相关关系,道路密度小于2.5 km.km-2时,道路密度越大,林建边界长度越大,建设用地景观和林地景观的生态学作用越剧烈。

Expansion of construction land and its effect on forest based on road network character: a case study of Shenzhen city

As landscape corridor,road network is ecologically related to construction landscape and forest landscape.With the expansion of road network,the construction land in Shenzhen also expanded rapidly and had great effects on forest landscape.Based on landuse data in 1996,2000,2002,2004 and 2008,this paper studied the relationships between road density（RD） and urbanization intense（UI）,dynamic correlation of construction-forest boundary.The results show that there are correlations between construction land scale,RD,UI and road expension intense,and that road network is significant to the social and economic development.Moreover,in the research period,forest degradation occurred severely and construction-forest boundary length（standarized） increased,which shows tendency that the boundaries became more complex.The result also shows the correlations between construction-forest boundary length and RD： the lower the RD（below 2.5 km.km-2） is,the larger the construction-forest boundary length is,and the more severe it gets between construction land landscape and forest landscape.