| Research on water use efficiencies of maize and soybean in northeast China |
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| DOI：10.7606/j.issn.1000-7601.2016.02.01 |
| Key Words: effective use of water water use efficiency response characteristic water use |
| Author Name | Affiliation | | MI Na | Institute of Atmospheric Environment, China meteorological Administration (Shenyang), Shenyang, Liaoning 110166, China | | ZHANG Yu-shu | Institute of Atmospheric Environment, China meteorological Administration (Shenyang), Shenyang, Liaoning 110166, China | | CAI Fu | Institute of Atmospheric Environment, China meteorological Administration (Shenyang), Shenyang, Liaoning 110166, China | | JI Rui-peng | Institute of Atmospheric Environment, China meteorological Administration (Shenyang), Shenyang, Liaoning 110166, China | | LIU Ming | Fushun Meteorological Service, Fushun, Liaoning 113006, China | | YU Xiu-jie | Liaoning Meteorological Information Centre, Shenyang, Liaoning 110166, China |
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| Abstract: |
| Based on data in recent 20 years about crop production, developmental period, and soil water content collected from the agro-meteorological experiment sites at Da'an and Chaoyang (maize sites), and Huma and Jinzhou (soybean sites) in northeast China, as well as the trail results by periodic seeding, response of grain water use efficiency (WUEg) to precipitation/temperature and also the relationship between WUEg and water use efficiency at the level of biomass (WUEb) were analyzed. The results showed that the average maize WUEg in multi-years at Da'an and Chaoyang were 1.75±0.47 kg·m-3 and 1.98±0.72 kg·m-3, respectively, and soybean WUEg at Huma and Jinzhou were 0.63±0.35 kg·m-3 and 0.55±0.18 kg·m-3, respectively. For maize, the relationship between WUEg and precipitation during planting to harvest exhibited a quadratic function at a significant level of P<0.05. The relationship between WUEg and mean temperature during growing period showed no obvious pattern. For soybean, WUEg was significantly negatively correlated with precipitation during growing period. Results from historic data showed that soybean WUEg was elevated with the increase of mean temperature during growing period, although the correlation between them was not significant. In addition, at Da'an and Chaoyang areas, high WUEg did not agree with the water consumption for high yield, suggesting that in semi-arid and semi-humid regions under drought stress, effective use of water (EUW) but not water use efficiency was the critical factor to determine crop yield. It can be concluded that water use is the main (not the exclusive) drive of yield under drought stress. |
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