论文部分内容阅读
城市化过程使得土地利用、地表植被覆盖发生着显著的变化,如何定量化描述城市化对植被物候的影响越来越受到各方的关注。基于京津唐地区2001~2006年NDVI时间序列影像,得出了京津唐地区植被物候空间分布格局,计算出北京、天津、唐山3个核心城市城区的距离变量与平均植被物候,并分析了城市化对植被物候指标的影响趋势。结果表明:①2001~2006年,北京城市化使得城区及离城区较近的地方植被生长开始时间提前、结束时间推后、生长季周期变长、NDVI振幅减小;②天津和唐山的城市化使得城区及离城区较近的地方植被生长开始时间延后、结束时间提前、生长季周期变短、NDVI振幅减小;③城市化对植被物候的影响与该地区城市扩张类型存在相关性关系。
The process of urbanization leads to significant changes in land use and vegetation cover. How to quantitatively describe the impact of urbanization on vegetation phenology has drawn more and more attention from all parties. Based on NDVI time series images of Beijing, Tianjin and Tangshan from 2001 to 2006, the spatial distribution pattern of vegetation phenology in Beijing, Tianjin and Tangshan was obtained, and the distance variables and average vegetation phenology in urban areas of Beijing, Tianjin and Tangshan were calculated and analyzed Impact of Urbanization on Vegetation Phenology Index. The results show as follows: (1) From 2001 to 2006, Beijing urbanization led to the earlier start of growth of vegetation in urban areas and urban areas, and the longer the growing season, the longer the growth season and the decrease of NDVI amplitude. ②The urbanization of Tianjin and Tangshan made Urban areas and urban areas closer to the urban areas began to delay the growth of vegetation, ending time earlier, shorter growing season, NDVI amplitude decreased; ③ urbanization on the impact of vegetation phenology and urban expansion in the region there is a correlation between types.