Spatiotemporal variation in water productivity of corn and its influencing factors in Liaoning Province
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Abstract:
The spatiotemporal variation and influencing factors of different corn water productivity index are analyzed based on the corn plant ing, irrigation water consumption data and meteorological data of the 14 cities of Liaoning Province from 2005 to 2017 using linear tendency estimate and global spatial auto correlation analysis method under different rainfall year type ( dry, flat, wet) perspective. The results show that: On the time scale, the entire province perennial average corn irrigation water productivity is 1. 63 kg/ m3 , and the overall corn water productivity fluctuated at a rate of 0.04 kg / m3 per 10 years. On the spatial scale, the annual corn irrigation water productivity of the whole province is high in the northwest and low in the southeast. In the dry year ( 2006) and flat year ( 2007) , corn water productivity was high in the northeast and low in the southwest, while in the wet year ( 2012) , it was high in the no rthwest and low in the southeast, respectively . Single corn yield is the most significant factor that affected the water productiv ity indices. The research results can provide some references for improving agricultural water use efficiency and relieving water r esource pressure in Liao ning Province.
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