Towards mapping the extent of irrigation in the last century

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009Q    $S0 $uhttp://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/5916/ $xC 
010@    $aeng 
011@    $a2008 
016A    $aDg 
021A    $aTowards mapping the extent of irrigation in the last century $dtime series of irrigated area per country ; research report $hKatharina Freydank and Stefan Siebert $nElektronische Ressource 
028C    $7 $8Freydank, Katharina [Tnu] $9206951221 
028C/01 $7 $8Siebert, Stefan [Tnd] $9151923906 
032@    $aApril 2008 
033A    $pFrankfurt (Main) $nUniv., Inst. of Physical Geography 
034D    $aOnline-Ressource 
036E    $aFrankfurt hydrology paper $l8 
036F    $x18 $8Frankfurt hydrology paper $918110394X $l8 
044K    $RPrimärer Sektor $RLandbau $#Agriculture $#Agriculture $#Agriculture $#Agricoltura $#Agricultura $#agriculture $#Agriculture $#Landwirtschaft $#Landwirtschaft $#Agrarwirtschaft $#Agrarsektor $#Landwirtschaftlicher Sektor $74034402-2 $8Landwirtschaft [Tsz] $9085092525 
044K    $#Irrigation $#Irrigation $#Irrigazione $#Riego $#irrigation $#Bewässerung $#Bewässerung $#Bewässerung $#Künstliche Bewässerung $74006306-9 $8Bewässerung [Ts1] $9085008850 
044K    $af Online-Publikation 
045E    $c910 
045R    $aGeschichte 1900-2003 
047I    $aA data set of annual values of area equipped for irrigation for all 236 countries in the world during the time period 1900 - 2003 was generated. The basis for this data product was information available through various online data bases and from other published materials. The complete time series were then constructed around the reported data applying six statistical methods. The methods are discussed in terms of reliability and data uncertainties. The total area equipped for irrigation in the world in 1900 was 53.2 million hectares. Irrigation was mainly practiced in all the arid regions of the globe and in paddy rice areas of South and East Asia. In some temperate countries in Western Europe irrigation was practiced widely on pastures and meadows. The time series suggest a modest rate of increase of irrigated areas in the first half of the 20th century followed by a more dynamic development in the second half. The turn of the century is characterized by an overall consolidating trend resulting at a total of 285.8 million hectares in 2003. The major contributing countries have changed little throughout the century. This data product is regarded as a preliminary result toward an ongoing effort to develop a detailed data set and map of areas equipped for irrigation in the world over the 20th century using sub-national statistics and historical irrigation maps. 

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