| Climate response for equivalence of crop water consumption induced by climate in Minqin County based on water footprint |
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| DOI：10.7606/j.issn.1000-7601.2017.06.32 |
| Key Words: water footprint, WSI, water consumption induced by climate Minqin County |
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| Abstract: |
| On the basis of elaboration of the water footprint and the water resources stress indicators, we calculated the blue water demand, the total water consumption and the unit of crop water consumption of eight kinds of crops, (maize, wheat, cotton, sunflower, apple, melons and vegetables) in Minqin County from 1991 to 2013. And we studied the variation law of total water consumption and unit of water consumption with time of these crops in 23 years. We analyzed unit climate water consumption of four kinds of typical crops: wheat, maize, cotton and melons, using preferred HP filter method from three kinds of economic and technical analysis models of water consumption. Furthermore, we discussed the relationship between climate water consumption and the related climate factors of these crops using stepwise regression analysis method. The results were amazing. Firstly, water consumption of crops increased year by year, maximum total water consumption of food crops changed the most, followed by vegetables and sunflower. However, unit of crop water consumption diminished in the wave. Secondly, HP filter method is an optimal model for analyzing climate water consumption. The trend of unit of crop climate water consumption was inapparent, but the wave was prominent in this period, and the difference was significant between different crops. Thirdly, the main climate factors that influenced the unit of crop climate water consumption were total rainfall in May and June and relative humidity in July, and there was no significant correlation with temperature during the growth period. In conclusion, response mode to climate change of different crop's water consuption changes vary greatly. Crop's water consurnption is affetted by precipitation and humidity significantly and the response mode trend of global warming is not obvious. |
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