Name: Global change in rain-use efficiency between 1981 and 2003 (Δ RUE/yr*1000)
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Description: Rain-use efficiency was calculated as the ratio of annual sum NDVI and station-observed annual rainfall (Δ RUE/yr*1000)
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Copyright Text: Rain-use efficiency (RUE) is considered to make allowance for the effect of fluctuations in rainfall on biomass productivity. RUE may fluctuate dramatically in the short term - often, there is a sharp decline in RUE in a wet year and it is assumed that the vegetation, whether cultivated or semi-natural, cannot make immediate use of the additional rain. However, where rainfall is the main limiting factor on biomass productivity, the long-term trend of RUE could be a good indicator of land degradation or improvement (Houérou 1984, 1988, 1989; Snyman 1998; Illius and O’Connor 1999; O’Connor and others 2001). RUE also accommodates the effects of local variations in slope, soil and vegetation (Justice and others 1991). FAO, 2008.
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