利用AVHRR植被指数数据集分析中国东部季风区的物候季节特征

Seasonal Phenological Characteristics in East China Monsoon Regionwith AVHRR Normalized Difference Vegetation Index Data Set

利用ＮＯＡＡ／ＮＡＳＡＰａｔｈｆｉｎｄｅｒＡＶＨＲＲ陆地数据集，建立了中国东部季风区（１０８°－１２３°Ｅ，２１°－４５°Ｎ）的１９８６年归一化植被指数（ＮＤＶＩ）距平图像序列。对此数据集进行主成分分析（ＰＣＡ），前２个主成分的时间序列和空间场展示了中国东部季风区植被物候季节性特征和地域差异。南岭一五夷山以南的华南地区，植被生长季的物候季节性变化不明显。在南岭－五夷山以北地区，植被生长季的物候季节性特征明显，可以比较清晰地确定生长季的变化过程。以淮河流域为界，植被生长季的物候季节性特征又存在明显差异。华北平原表现出强烈的双峰植被物候过程。淮河以南地区，虽然也存在这种双峰物候过程，但比较华北平原的植被，还具有持续性的植被生长特征。淮河流域构成一条区分南北物候季节特征差异的过渡带。

The Normalized Difference Vegetation Index (NDVI) departure data set in East China monsoon region (108-123°E, 21-45°N) in 1986 was established with NOAA/NASA Pathfinder AVHRR Land data set .The principle component analysis (PCA) was implemented on this data set .The temporal curves and spatial fields of the first and second principle components expose the significant characteristics of vegetation phenology in seasonality and spatial patterns in East China monsoon region. In the area south to Nanling-Wuyi Mountains, there are not very clear vegetation seasonal variations. However, obvious seasonal phenological features in whole growing season exist in the areas north from Nanling-Wuyi Mountains. In Huabei Plain which locates in the north of Huai River Valley, phenology is distinguished with the double peak growing process. Though the similar double peak growing process also happens, there are more continuous characteristics of vegetation growing in the south of Huai River Valley. Huai River Valley forms a transitional zone of vegetation seasonal phenology.