深圳市大鹏半岛土地利用变化对植被覆盖动态的影响

城市化背景下的植被覆盖动态研究对于区域生态保护工作具有重要的指导意义.利用深圳市1995-2007年的遥感数据以及1996和2007年土地变更调查资料,基于归一化植被指数轨迹追踪分析和叠图代数计算方法,对大鹏半岛植被覆盖动态类型及其空间分异、土地利用变化结构和格局特征以及土地利用变化与植被覆盖动态之间的响应关系进行研究.结果表明:1995-2007年,研究区65％的地区植被覆盖发生显著改变,植被覆盖状况总体趋于好转;城市化和商品农业发展是该区土地利用动态变化的主要成因,研究时段内31％的地表发生了用地功能转变;土地利用变化是区内植被覆盖发生改变的重要成因之一,约35％的植被覆盖出现退降过程区域与土地功能转变有关;55％的用地功能转变区域因机械干扰导致植被覆盖退化,但至研究期末,大多数退化区域已经进入植被覆盖显著改善阶段.

Influence of land use change on vegetation cover dynamics in Dapeng Peninsula of Shenzhen, Guangdong Province of South China

To study the vegetation cover dynamics under urbanization is of significance to direct regional ecological conservation. Based on the 1995-2007 remote sensing data and the investigation data of 1996 and 2007 land use change in Shenzhen, and by using NDVI index tracking and algebraic overlay calculation, this paper analyzed the vegetation types and their spatial differentiation, land use change pattern, and the relationships between land use change and vegetation cover dynamics in Dapeng Peninsula of Shenzhen. In 1995-2007, the vegetation cover in 65% of the study area changed significantly, with an overall increasing trend. Land use change was mainly caused by the development of urbanization and commercial agriculture, with 31% of the land surface changed in land use function. The land use change was one of the main causes of vegetation cover dynamics, and about 35% of the region where vegetation cover significantly degraded was related to land use change. 55% of the region where land use function changed due to mechanical disturbance caused the degradation of vegetation cover, but by the end of the study period, the vegetation cover in most of the degraded region had being improved significantly.