| Effects of different irrigation quotas on photosynthetic characteristics and yield of spring wheat in desert oasis |
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| DOI：10.7606/j.issn.1000-7601.2016.03.14 |
| Key Words: spring wheat irrigation quota photosynthetic characteristics yield factor WUE desert oasis |
| Author Name | Affiliation | | MA Li | Key lab of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | SONG Dian-xing | Key lab of Disaster Monitoring and Mechanism Simulating of Shaanxi Province, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | WANG Quan-jiu | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China； Institute of Water Resources, Xi'an Technology University, Xi'an, Shannxi 710048, China |
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| Abstract: |
| In order to define the effects of different irrigation quotas on photosynthetic characteristics and yield of spring wheat in desert oasis, through the field observation and experiment, has analyzed the effects of six different irrigation quotas on the leaf net photosynthetic rate, transpiration rate, daily change of stomatal conductivity and grain yield of spring wheat. The results showed that: Under high irrigation quotas (360 mm, 420 mm and 480 mm）, the change curves of the spring wheat leaf net photosynthetic rate and transpiration rate were showed unimodal curve change, and no “noon break” phenomenon. But under the low irrigation quotas (0, 240 mm and 300 mm), the photosynthetic rate was showed bimodal curve, and existed a "lunch break" phenomenon. At the same time, the stomatal conductance by high irrigation quota treatments was greater than the low irrigation quota treatments. The relationship of soil water content on photosynthetic rate of spring wheat in whole growth period was showed the quadratic curve. The photosynthetic rate was reached the maximum critical value when the soil water content was increased to about 12% to 13%, and then it was declined. The leaf net photosynthetic rate, transpiration rate, grain yield, thousand grains weight and water use efficiency (WUE) total were the biggest under W4 treatment, it was the optimal irrigation amount for spring wheat growth in this areas. So, excessive irrigation was restrained the photosynthetic rate of spring wheat, caused the yield decreas, reduced the WUE and caused the waste of water resources. |
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