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The China-Pakistan Economic Corridor (CPEC) is an important part of the Belt and Road Initiative, and CPEC is located in an arid-semi-arid region with scarce freshwater resources and a high
proportion of agricultural water use.
According to the World Bank database and the China Tertiary Industry Statistical Yearbook (2017), agriculture in Pakistan and Xinjiang accounts for more than 90% of total water (94% in Pakistan and 93.
1% in Xinjiang), and continued population and agricultural production growth has further exacerbated the region's demand for
water resources.
In the context of water scarcity, the supply of water for agricultural irrigation is threatened, seriously affecting crop production and human food security, and the quantification of irrigation demand is the basis for the sustainable management of
agricultural water resources.
Therefore, it is crucial
to accurately quantify the irrigation water demand in this area and optimize the allocation of water resources.
In view of this problem, the research team of Chen Yaning, a researcher from the State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, based on the indicators of net irrigation water demand (IRnet), irrigation demand index (IDI) and total irrigation demand (IR), studied and analyzed the temporal and spatial evolution pattern of irrigation water demand in the irrigation area of the China-Pakistan Economic Corridor from 2000 to 2015, and put forward optimization suggestions for regional irrigation water use based on the scenario simulation results of Bayesian network model
。
The results show that from 2000 to 2015, the average annual effective precipitation in the irrigated areas of the China-Pakistan Economic Corridor increased by 71%, the total irrigation demand of maize, rice and cotton showed a fluctuating downward trend (decreased by about 37.
61km3), and the overall irrigation demand improved slightly (the average annual IDI trend slope was about 0.
028a-1).
。 In addition, according to the Bayesian model simulation results based on the scenario simulation of different major crop planting structures, moderately increasing the proportion of maize planting in this area is conducive to increasing food production (high value range +9%), and while increasing human food supply, by increasing the input of cereal for poultry feeding, wet milling, etc.
, it can increase the income level of farmers, reduce the proportion of malnourished people (low value range +7.
2%), thereby improving the regional
water and food security.
The results were published in Scientific Reports under the title "Spatiotemporal variation in irrigation water requirements in the China–Pakistan Economic Corridor
.
" The first author of the paper is Li Yaqi,
a graduate student of Xinjiang Institute of Birthplace.
The research was supported
by the National Natural Science Foundation of China.
Article link: https://rdcu.
be/cXy4Q
Figure 1 Research technology roadmap
Fig.
2 Spatial distribution of annual average IRnet of wheat, maize and cotton in CPEC irrigated area, 2000-2015, its trend and significance
