中国生态农业学报2012，Vol.20Issue(4)：459-465,7.DOI:10.3724/SP.J.1011.2012.00459
不同氮效率基因型冬小麦物质生产对CO2浓度升高的响应研究
Response of matter production of two winter wheat genotypes with differing nitrogen efficiency to di-atmospheric CO2 concentration and nitrogen supply
摘要
Abstract
Atmospheric carbon dioxide (CO2) level continues to rise at an unprecedented rate and is expected to exceed 750 umol-mol-1 by the end of the 21st century. Increasing atmospheric CO2 concentration has been associated to changes in global environment. The effect of elevated atmospheric CO2, as driven by global environmental change, on agricultural production remains unclear. To further clarify this effect, leaf area, plant height, biomass and yield of two winter wheat varieties (the high N efficiency "Xiaoyan22" and the low N efficiency "Xiaoyan6") under different atmospheric CO2 (375 umol-mol-1 and 750 nmol-mol-1) and nitrogen amendments [0, 0.15 g(N)·kg-1(soil) and 0.30 g(N)·kg-1(soil)] conditions were measured in open-top chamber (OTC) pot soil experiments. Results showed that while ear length and plant height of "Xiaoyan22" were significantly higher, leaf area and stem height were lower than those of "Xiaoyan6" for the di-atmospheric CO2 (750 umol-mor1) with nitrogen amended treatments. Compared with ambient atmospheric CO2 level (375 umol-moL-1), di-CO2 concentration (750 umol-mor1) significantly improved yields of the two winter wheat varieties under N treatments. Yields of "Xiaoyan6" and "Xiaoyan22" were 90.5% and 52.9% greater underdi-CO2 concentration with 0.15 g(N)kg (soil) treatment and also 73.9% and 93.6% greater under di-CO2 concentration with 0.30 g(N)·kg-1(soil) treatment than those under the ambient CO2 condition. Di-CO2 concentration increased above-ground biomass, root biomass, total biomass, spikes per pot, grains per spike and yield of the two winter wheat varieties under the same nitrogen conditions. Although elevated N application exhibited no consistent effects on agricultural production, increasing N supply enhanced above-ground biomass, total biomass, grains per spike and yield. Above-ground biomass, total biomass, grains per spike and yield with di-CO2 condition were higher under 0.30 g(N)·kg-1(soil) treatment than under 0.15 g(N)·kg-1(soil) treatment. The results from this study indicated that increasing N supply benefited the positive effects of elevated CO2 on crop production.关键词
CO2浓度倍增/氮素水平/冬小麦/物质生产/氮效率/产量Key words
Di-atmospheric CO2 concentration/Nitrogen level/Winter wheat/Matter production/Nitrogen efficiency/Yield分类
农业科技引用本文复制引用
沈玉芳,许育彬,王佩玲,李世清..不同氮效率基因型冬小麦物质生产对CO2浓度升高的响应研究[J].中国生态农业学报,2012,20(4):459-465,7.基金项目
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10502)、中国博士后科学基金(20080441196)和中央高校基本科研业务费专项资金项目(QN2009083)资助 （10502）
