| Responses of photosynthetic characters, water use efficiency and sap flow velocity to phosphorus adding of wheat on the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2011.04.16 |
| Key Words: wheat phosphorus photosynthetic characteristics water use efficiency sap flow yield |
| Author Name | Affiliation | | ZHANG Beibei | College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China
Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Modeling, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China | | LIU Wenzhao | College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The objective of the research was to understand the gas exchange, instantaneous water use efficiency(WUEi) and sap flow differences under 3 phosphorus fertilizer treatments (F0, F1, and F2) at different growth stages on the Loess Plateau in Shaanxi Province; and the correlation and regression relationship between leaf transpiration rate (Tr) and sap flow velocity were also investigated. Results showed that: under different treatments, the daily variation curve of leaf photosynthesis rate (Pn) had two peaks and the value of Pn was F2>F1>F0; it was said that the P adding could improve the leaf Pn. The daily variation of leaf Tr was similar to Pn at jointing stage; the daily variation curve of Tr at flowering stage had one peak and F2>F1>F0. The WUEi of wheat at flowering stage was higher than that at jointing stage, and the highest value of the WUEi at both stages was under F1 treatment, and it was 3.04 and 3.77μmol CO2/mmol H2O respectively; it showed that adding P could increase the WUEi. The daily variation of sap flow velocity for different treatments was similar to the result of the Tr at flowering stage, and the highest sap flow velocity in a day was 2.796、3.734 g/h and 3.873 g/h under F0, F1 and F2 respectively; the sap flow was increased by the P adding. At same time, the yield was improved by the fertilizer adding and there was significant treatment differences. Radiation, temperature, humidity and wind speed were the main factors to sap flow. There was a significant positive correlation between sap flow velocity and leaf transpiration rate at F1 and F2 (rF1=0.73*和rF2=0.73*). And there was also significant regression between them; the best regression was under F2 treatment, the value of coefficien
t of determination was 0.95. |
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