干旱地区农业研究2012，Vol.30Issue(1)：12-18,7.
不同氮效率小麦品种氮素吸收利用对CO2浓度升高的响应
Response of nitrogen uptake and use of wheat varieties with different nitrogen use efficiencies to CO2 concentration enrichment
摘要
Abstract
A pot experiment with open top chambers (OTCs) was conducted to investigate the effect of CO2 enrich-ment 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 nitro-gen 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 in-dexes 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 sensitivi-ties was Xiaoyan 6 under the nitrogen application level of 150 mg/kg soil and was Xiaoyan 22 under the nitrogen applica-tion level of 300 mg/kg soil. However, the responses of two varieties to C02 elevation in the other indexes were contrary in NDUE. 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 efficien-cy under higher nitrogen level.关键词
小麦/不同氮效率品种/大气CO2浓度升高/氮素吸收利用Key words
wheat/ varieties with different nitrogen use efficiencies/ CO2 concentration enrichment/ nitrogen uptake and use分类
农业科技引用本文复制引用
许育彬,沈玉芳,李世清..不同氮效率小麦品种氮素吸收利用对CO2浓度升高的响应[J].干旱地区农业研究,2012,30(1):12-18,7.基金项目
中央高校基本科研业务费专项(QN2009083) （QN2009083）
陕西省自然科学基金项目(SJ08C104) （SJ08C104）
