AVHRR derived phenological change in the Sahel and Soudan, Africa, 1982-2005
AVHRR derived phenological change in the Sahel and Soudan, Africa, 1982-2005
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DOI：
10.1016/j.rse.2006.11.025
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发表时间：
2007-06-29
影响因子：
13.5
通讯作者：
Jonsson, P.
中科院分区：
文献类型：
--
作者：
Heumann, B. W.;Seaquist, J. W.;Jonsson, P.
非洲萨赫勒地区从1960年代初到1990年代中期降雨量减少。最近的研究发现，自1982年以来，该地区的NDVI幅度和生长季节综合NDVI增加。然而，这些研究并没有研究植物物候是如何变化的。物候学检查生命周期事件，如萌芽和叶片衰老。使用软件TIMESAT估计从GlMMS AVHRR NDVI数据集的物候参数，我们已经发现苏丹和几内亚地区的生长和生长季节结束的长度显着的积极趋势，但在萨赫勒地区的显着趋势无法检测。这些趋势的地理范围与更北方的NDVI幅度和生长季综合NDVI的正趋势形成对比。结果表明，两种类型的“绿化”的趋势与降雨量的变化，因为在20世纪80年代初的干旱。(c)2006年爱思唯尔公司All rights reserved.
The Sahel region of Africa has experienced a decrease in rainfall from the early 1960s to mid 1990s. Recent studies have detected an increased in NDVI amplitude and growing season integrated NDVI for the region since 1982. However, these studies have not examined how plant phenology has changed. Phenology examines life cycle events such as bud burst and leaf senescence. Using the software TIMESAT to estimate phenological parameters from the GlMMS AVHRR NDVI dataset, we have found significant positive trends for the length of the growing and end of the growing season for the Soudan and Guinean regions, but significant trends in the Sahel could not be detected. The geographical extent of these trends contrasts with the more northern extent of positive trends of NDVI amplitude and growing season integrated NDVI. Results suggest two types of "greening" trends associated with rainfall change since the drought in the early 1980s. (c) 2006 Elsevier Inc. All rights reserved.