Time series (1980-2012) crop areas in the districts and canal commands of Pakistan

[摘要] We aimed to use crop area, production and yield data for several purposes: to estimate crop water demand and use, and hence river water diversions and groundwater pumpage in a hydrological model of the Indus River basin; to make crop production estimates from the river basin model for use in a model of the Pakistan economy, and hence assess potential impacts of water management policies on the economy; to assess the volumes of water used in irrigation and hence assess the sustainability of use; and to assess trends in crop area, production and productivity in order to assess the likely future food security for Pakistan, and whether limited water availability will jeopardise the prospects for food security.To fulfil these aims, we collated crop area, production and yield information for the districts in Pakistan. For 13 major crops, the data are available from 1981-82 to 2011-12. For minor crops, the data are available for 2007-08 to 2011-12. We extrapolated the minor crop area backwards in time to 1981-82, by assuming constant ratios of minor crop areas to major crop areas.We further summed the district areas of individual crops into crop groups. The crop groups comprise crops with similar requirements for amounts and timing (seasonality) of irrigation water supply. They also correspond to groups of crops considered in an economic model of the Pakistan economy.The areas of crop groups are then re-mapped from districts into areas irrigated by individual main canals (such areas are known as canal commands). The re-mapping is based on maps of districts and canal commands, and involves assessing the portion of a district which overlays a canal command; crop groups are then mapped into the canal command in that proportion, subject to the total for all crops not exceeding the area of available for cropping within the canal command.

[发布机构] CSIRO

[学科分类] 地球科学(综合)