| Response of nitrogen uptake and use of wheat varieties with different nitrogen use efficiencies to CO2 concentration enrichment |
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| DOI：10.7606/j.issn.1000-7601.2012.01.03 |
| Key Words: wheat varieties with different nitrogen use efficiencies CO2 concentration enrichment nitrogen uptake and use |
| Author Name | Affiliation | | XU Yubin | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
Deptermant of Natural Resources and the Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | SHEN Yufang | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, CAS and MWR,
Yangling, Shaanxi 712100, China | | LI Shiqing | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, CAS and MWR,
Yangling, Shaanxi 712100, China |
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| Abstract: |
| A pot experiment with open top chambers (OTCs) was conducted to investigate the effect of CO2 enrichment on nitrogen uptake and use of winter wheat and the difference between two varieties, Xiaoyan 6 with a low nitrogen use efficiency and Xiaoyan 22 with a high nitrogen use efficiency. Wheat plants were grown under two CO2 concentrations (375 and 750 μL/L) and three nitrogen application levels(0, 150 and 300 mg/kg soil). The results showed that nitrogen application could increase dry matter accumulated amount (MAA), nitrogen accumulated amount(NUA), nitrogen harvest index (NHI), translocation amount (NTA) and translocation rate (NTR) of pre anthesis nitrogen to grain, but it reduced nitrogen use efficiency for grain yield and dry matter production( NGUE and NDUE). Compared the ambient CO2 concentration (375 μL/L), under some nitrogen nutrition condition, elevated CO2 had positive effects on these indexes of wheat. Therefore, of the sensitivity of two varieties responding to CO2 enrichment in the indexes were different. Xiaoyan 22 was more sensitive than Xiaoyan 6 in NHI, NGUE and NTR. In NDUE, the variety of with higher sensitivities was Xiaoyan 6 under the nitrogen application level of 150 mg/kg soil and was Xiaoyan 22 under the nitrogen application level of 300 mg/kg soil. However, the responses of two varieties to CO2 elevation in the other indexes were contrary in NDU
E. Comprehensively, CO2 enrichment could promote the dry matter accumulation, nitrogen uptake and use of wheat under nitrogen application condition, and the effect would more obvious on varieties with high nitrogen use efficiency under higher nitrogen level. |
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