Arid
DOI10.3390/rs8110948
Environmental and Anthropogenic Degradation of Vegetation in the Sahel from 1982 to 2006
Rishmawi, Khaldoun; Prince, Stephen D.
通讯作者Prince, Stephen D.
来源期刊REMOTE SENSING
ISSN2072-4292
出版年2016
卷号8期号:11
英文摘要

There is a great deal of debate on the extent, causes, and even the reality of land degradation in the Sahel. Investigations carried out before approximately 2000 using remote sensing data suggest widespread reductions in biological productivity, while studies extending beyond 2000 consistently reveal a net increase in vegetation production, strongly related to the recovery of rainfall following the extreme droughts of the 1970s and 1980s, and thus challenging the notion of widespread, long-term, subcontinental-scale degradation. Yet, the spatial variations in the rates of vegetation recovery are not fully explained by rainfall trends. It is hypothesized that, in addition to rainfall, other meteorological variables and human land use have contributed to vegetation dynamics. Throughout most of the Sahel, the interannual variability in growing season Sigma NDVIgs (measured from satellites, used as a proxy of vegetation productivity) was strongly related to rainfall, humidity, and temperature (mean r(2) = 0.67), but with rainfall alone was weaker (mean r(2) = 0.41). The mean and upper 95th quantile (UQ) rates of change in Sigma NDVIgs in response to climate were used to predict potential Sigma NDVIgs-that is, the Sigma NDVIgs expected in response to climate variability alone, excluding any anthropogenic effects. The differences between predicted and observed Sigma NDVIgs were regressed against time to detect any long-term (positive or negative) trends in vegetation productivity. Over most of the Sahel, the trends did not significantly depart from what is expected from the trends in meteorological variables. However, substantial and spatially contiguous areas (similar to 8% of the total area of the Sahel) were characterized by negative, and, in some areas, positive trends. To explore whether the negative trends were human-induced, they were compared with the available data of population density, land use, and land biophysical properties that are known to affect the susceptibility of land to degradation. The spatial variations in the trends of the residuals were partly related to soils and tree cover, but also to several anthropogenic pressures.


英文关键词productivity vegetation land degradation desertification Sahel remote sensing residual trends RESTREND NDVI rain-use efficiency RUE
类型Article
语种英语
国家USA
收录类别SCI-E ; SSCI
WOS记录号WOS:000388798400068
WOS关键词NET PRIMARY PRODUCTION ; LAND DEGRADATION ; DRYLAND DEGRADATION ; SOIL ERODIBILITY ; AFRICAN SAHEL ; RAINFALL VARIABILITY ; PRIMARY PRODUCTIVITY ; QUANTILE REGRESSION ; SEMIARID RANGELAND ; GREENING SAHEL
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/2XILL650/195983
作者单位Univ Maryland, Dept Geog Sci, College Pk, MD 20782 USA
推荐引用方式
GB/T 7714
Rishmawi, Khaldoun,Prince, Stephen D.. Environmental and Anthropogenic Degradation of Vegetation in the Sahel from 1982 to 2006[J],2016,8(11).
APA Rishmawi, Khaldoun,&Prince, Stephen D..(2016).Environmental and Anthropogenic Degradation of Vegetation in the Sahel from 1982 to 2006.REMOTE SENSING,8(11).
MLA Rishmawi, Khaldoun,et al."Environmental and Anthropogenic Degradation of Vegetation in the Sahel from 1982 to 2006".REMOTE SENSING 8.11(2016).
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