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Farming the Planet. Part 1: The Geographic Distribution of Global Agricultural Lands in 1 the Year 2000 2 3

Farming the Planet. Part 1: The Geographic Distribution of Global Agricultural Lands in 1 the Year 2000 2 3,Navin Ramankutty,Amato T. Evan,Chad Monfre

Farming the Planet. Part 1: The Geographic Distribution of Global Agricultural Lands in 1 the Year 2000 2 3   (Citations: 3)
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    • ...These global data sets quantify, for example, cropland extent [Ramankutty et al., 2008; Ramankutty and Foley, 1998] or extent of the areas equipped for irrigation (Döll and Siebert [2000] and Siebert et al. [2005], updated by Siebert et al. [2007])...
    • ...One comprehensive data set contains harvested areas for all 175 crops currently covered by the statistics of the Food and Agriculture Organization of the United Nations (FAO) [Monfreda et al., 2008]...
    • ...In contrast, harvested areas of rainfed crops were computed for each of the 402 spatial units (Figure 1) as the difference between total harvested crop area [Monfreda et al., 2008] and irrigated harvested crop area (section 2.2.2) (Figure 2). [18] To define total annual harvested crop area, we used an inventoryat5arcminresolution[Monfredaetal.,2008].This data set consists of grids for 175 crops consistent to the Figure 1. Spatial units for ...
    • ...It was developed by distributing harvested crop areas derived from subnational statistics to cropland areas [Ramankutty et al., 2008] using different potential cropping intensities in cells with area equipped for irrigation (AEI) and in cells without AEI...
    • ...Statistics for 2299 spatial units of the first level below the national and for 19,751 second level units were used [Monfreda et al., 2008]...
    • ...harvested area 5 arc min grid, data layers for 175 different crops Monfreda et al. [2008]...
    • ...Cropland extent 5 arc min grid Ramankutty et al. [2008] Area equipped for irrigation 5 arc min grid Siebert et al. [2007] Administrative boundaries of countries and subnational units GIS‐Shapefile ESRI [2004]...
    • ...geog.mcgill.ca/landuse/pub/Data/175crops2000/. [19] Cropland extent around the year 2000 was derived from a data set that was developed by combining national cropland statistics to remote sensing–based land cover classifications [Ramankutty et al., 2008]...
    • ...2.2.1. Reclassification of Total Harvested Crop Area at the Grid Cell Level [24] Total crop‐specific harvested area (without distinction of irrigated and rainfed crops) was available for 175 crops [Monfreda et al., 2008]...
    • ...We assigned each of these 175 crops to one of the 26 MIRCA2000 crop classes (Figure 2). For example, harvested area of the MIRCA2000 crop maize was computed as the sum of harvested areas of three crops by Monfreda et al. [2008] (Table S1)...
    • ...Because of inconsistencies between the irrigation statistics used here and the harvested area statistics used by Monfreda et al. [2008], crop‐specific irrigated area for a given crop was sometimes larger than the related total harvested crop area, in particular in arid calendar units...
    • ...AEI, for example, was about 30% larger than cropland extent of Ramankutty et al. [2008], in the arid country of Egypt [Portmann et al., 2008]...
    • ...[41] Additional cropland extent was generated in grid cells whereharvested cropareaAH [Monfredaet al., 2008] existed, but cropland extent [Ramankutty et al., 2008] was zero...
    • ...used as input data set [Ramankutty et al., 2008]...
    • ...2 Cropland extent [Ramankutty et al., 2008] (modified as described in section 2.2.4) In each grid cell and month the sum of crop‐specific irrigated and rainfed areas is lower than or equal to the cropland extent...
    • ...3 Harvested crop area [Monfreda et al., 2008] In each grid cell and for each crop class the annual sum of the irrigated and rainfed harvested crop area is equal to the total (rainfed and irrigated) harvested area of the specific crop...
    • ...cropland extent CEMIRCA as reported for countries (Table S2) and United Nations (UN) regions (Table 5) and discussed in the following sections was about 7% larger than the input cropland extent [Ramankutty et al., 2008]...
    • ...Results at the Global Scale [54] Total harvested area in MIRCA2000 is 13.0 million km 2 yr −1 , of which 9.9 million km 2 yr −1 is rainfed, and 3.1 million km 2 yr −1 is irrigated (Table 4). The share of irrigated harvested area is 24%, which is larger than AEI [Siebert et al., 2007], which is 18% when expressed as a percentage of the total cropland extent [Ramankutty et al., 2008]...
    • ...The data set could possibly be outdated or inconsistent with the input data used in MIRCA2000 for China [FAO, 2005a; Monfreda et al., 2008]...
    • ...The major uncertainties in the input spatial data layers were investigated and discussed already [Ramankutty et al., 2008; Monfreda et al., 2008; Siebert et al., 2005]...
    • ...The major uncertainties in the input spatial data layers were investigated and discussed already [Ramankutty et al., 2008; Monfreda et al., 2008; Siebert et al., 2005]...
    • ...Artifacts of rainfed cultivation in very arid areas stemming from different total harvested area in the different input data could be avoided by harmonizing the crop‐specific harvested area in the CCCs for irrigated crops to the total crop‐specific harvested area by Monfreda et al. [2008]...
    • ...In contrast to the approach used to generate the currently applied data set of Monfreda et al. [2008], biophysical constraints should be taken into account for downscaling statistical data of harvested area for administrative units...

    Felix T. Portmannet al. MIRCA2000—Global monthly irrigated and rainfed crop areas around the y...

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