基于时间序列MODIS数据的贵州省森林物候地域分异

森林物候是气候与环境变化的重要指示器,对于陆地植被生态环境监测具有重要的意义。以2011～2013年的MODIS NDVI(归一化植被指数)为时间序列数据,采用Savizky-Golay(S-G)滤波平滑和动态阀值法,提取出贵州省2012年森林物候的生长起始日期(SOS)、生长结束日期(EOS)、生长季长度(LOS)和生长季振幅(AOS)4个参数,分别将提取的森林物候参数与经度、纬度和海拔做相关性分析。研究结果显示:(1)贵州省森林物候参数与纬度相关性整体较弱,因此贵州省森林物候纬度地带性地域分异的不显著;(2)贵州省森林物候生长起始期、生长季长度与经度呈极显著相关,而森林物候生长结束期与经度呈低度相关,整体上贵州省森林物候参数海陆(经度)地带性地域分异显著;(3)贵州省森林物候生长起始期、生长结束期与海拔呈显著相关,而森林物候生长季长度与海拔呈极显著相关,因此贵州省森林物候参数垂直(海拔)地带性地域分异的十分显著。

FOREST PHENOLOGICAL REGIONAL DIFFERENTIATION BASED ON TIME SERIES OF MODIS DATA IN GUIZHOU PROVINCE

Forest phenology as an important indicator of climate and environment change, for the land vegetation ecological environment monitoring is a great significance. This study time series MODIS NDVI (normalized difference vegetation index)data is 2011 to 2013, through Savizky-Golay (S-G)filter smoothing and dynamic threshold method, to extract the forest phenology four parameters that the start of growing season (SOS)、the end of growing season (EOS)、the length of growing season (LOS) and the amplitude of growing season (AOS) in Guizhou Province in 2012. and then, using the extracted Phenological parameters with longitude, latitude and altitude do correlation analysis. This study research shows that:(1) Overall, forest phenology parameters with latitude are weakly Correlation in Guizhou Province, therefore,forest phenological latitude zonal regional differentiation was not significant in Guizhou province;(2) Forest phenology of Guizhou Province the start of growing season and the length of growing season are extremely significant associated with longitude, the end of growing season of forest phenology is low correlation with longitude, Overall, forest phenological parameters land and sea (longitude) zonal regional differentiation is significant in Guizhou Province;(3) Forest phenology of Guizhou Province the start of growing season and the end of growing season are significantly associated with altitude, the length of growing season of forest phenology is extremely significant correlation with altutide,therefore,the forest phenological parameters vertical(altutide)zonal regional differentiation is very significant in Guizhou Province.