MODIS-NDVI-based mapping of the length of the growing season in northern Fennoscandia
MODIS-NDVI-based mapping of the length of the growing season in northern Fennoscandia
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DOI：
10.1016/j.jag.2007.10.005
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发表时间：
2008-09-01
影响因子：
7.5
通讯作者：
Makarova, Olga
中科院分区：
文献类型：
--
作者：
Karlsen, Stein Rune;Tolvanen, Anne;Makarova, Olga
芬诺斯坎迪亚北部是北极/高山-寒带过渡区的生态异质性区域。利用2000 ~ 2006年13个站点的白桦物候资料和16天250 m分辨率的MODIS-NDVI复合卫星资料绘制了白桦生长季节图。提出了一种新的基于像素特异性NDVI阈值和基于决策规则的制图方法来确定生长季节的开始和结束。NDVI数据与桦树物候数据具有较高的相关性。生长季节最早出现在挪威北部海岸山脉和大海之间的狭长低地地带。从低地到山地的开始有一个明显的梯度，对应于逐渐下降的温度梯度。在秋季，植被的黄化表现出更为异质性的格局。在55%的研究区域，生长季节的长度在100至130天之间。(C) 2007 Elsevier B.V.版权所有
Northern Fennoscandia is an ecologically heterogeneous region in the arctic/alpine-boreal transition area. Phenology data on birch from 13 stations and 16-day MODIS-NDVI composite satellite data with 250 m resolution for the period 2000 to 2006 were used to map the growing season. A new combined pixel-specific NDVI threshold and decision rule-based mapping method was developed to determine the onset and end of the growing season. A moderately high correlation was found between NDVI data and birch phenology data. The earliest onset of the growing season is found in the narrow strip of lowland between the mountains and the sea along the coast of northern Norway. The onset follows a clear gradient from lowland to mountain corresponding to the decreasing temperature gradient. In autumn, the yellowing of the vegetation shows a more heterogeneous pattern. The length of the growing season is between 100 and 130 days in 55% of the study area. (C) 2007 Elsevier B.V. All rights reserved.