Arid
DOI10.3390/rs5020982
Length of Growing Period over Africa: Variability and Trends from 30 Years of NDVI Time Series
Vrieling, Anton1; de Leeuw, Jan2; Said, Mohammed Y.3
通讯作者Vrieling, Anton
来源期刊REMOTE SENSING
ISSN2072-4292
出版年2013
卷号5期号:2页码:982-1000
英文摘要

The spatial distribution of crops and farming systems in Africa is determined by the duration of the period during which crop and livestock water requirements are met. The length of growing period (LGP) is normally assessed from weather station data-scarce in large parts of Africa-or coarse-resolution rainfall estimates derived from weather satellites. In this study, we analyzed LGP and its variability based on the 1981-2011 GIMMS NDVI3g dataset. We applied a variable threshold method in combination with a searching algorithm to determine start- and end-of-season. We obtained reliable LGP estimates for arid, semi-arid and sub-humid climates that are consistent in space and time. This approach effectively mapped bimodality for clearly separated wet seasons in the Horn of Africa. Due to cloud contamination, the identified bimodality along the Guinea coast was judged to be less certain. High LGP variability is dominant in arid and semi-arid areas, and is indicative of crop failure risk. Significant negative trends in LGP were found for the northern part of the Sahel, for parts of Tanzania and northern Mozambique, and for the short rains of eastern Kenya. Positive trends occurred across western Africa, in southern Africa, and in eastern Kenya for the long rains. Our LGP analysis provides useful information for the mapping of farming systems, and to study the effects of climate variability and other drivers of change on vegetation and crop suitability.


英文关键词phenology length of growing period AVHRR NDVI time series NDVI3g farming systems Africa
类型Article
语种英语
国家Netherlands ; Kenya
收录类别SCI-E
WOS记录号WOS:000315402700023
WOS关键词LAND-SURFACE PHENOLOGY ; VEGETATION PHENOLOGY ; CLIMATE-CHANGE ; WEST-AFRICA ; INTERANNUAL VARIABILITY ; MONITORING VEGETATION ; FOOD SECURITY ; SOUTH-AFRICA ; SEASON ; PRECIPITATION
WOS类目Remote Sensing
WOS研究方向Remote Sensing
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179707
作者单位1.Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, NL-7500 AE Enschede, Netherlands;
2.World Agroforestry Ctr ICRAF, Nairobi 00100, Kenya;
3.ILRI, Nairobi 00100, Kenya
推荐引用方式
GB/T 7714
Vrieling, Anton,de Leeuw, Jan,Said, Mohammed Y.. Length of Growing Period over Africa: Variability and Trends from 30 Years of NDVI Time Series[J],2013,5(2):982-1000.
APA Vrieling, Anton,de Leeuw, Jan,&Said, Mohammed Y..(2013).Length of Growing Period over Africa: Variability and Trends from 30 Years of NDVI Time Series.REMOTE SENSING,5(2),982-1000.
MLA Vrieling, Anton,et al."Length of Growing Period over Africa: Variability and Trends from 30 Years of NDVI Time Series".REMOTE SENSING 5.2(2013):982-1000.
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