大气CO2浓度增高对不同供氮水平下水稻生长和化感物质释放的影响

利用开放式空气CO2浓度升高(free air carbon-dioxide enrichment,FACE)平台中的水培试验,研究了低氮(LN:10 mg·L-1)和高氮(HN:30 mg·L-1)水平下,大气CO2浓度升高对化感与非化感水稻(Oryza sativa L.)品种的生长、碳氮比(C/N)和化感物质含量的影响,并分析了CO2浓度升高条件下水稻C/N和化感物质含量间的相互关系.结果表明:CO2浓度升高对化感(PI)与非化感水稻品种(秀水)的生长均有极显著促进作用.CO2浓度升高后,LN条件下水稻C/N显著增加,HN条件下则无显著变化.CO2浓度升高后化感水稻品种次生代谢物质含量增加,特征化感物质含量增加,非化感品种的这种变化不显著.化感水稻品种C/N分别与次生代谢物质含量和特征化感物质含量之间呈显著正相关关系.

Impact of Free Air CO2 Enrichment on Growth and Allelochemical Emission of Rice

An experiment of hydroponic culture of rice was carried out with treatments different in nitrogen supply and CO2 level on the FACE(free air carbon-dioxide enrichment) platform to investigate growth,C/N ratio and allelochemical contents of rice plants of different allelopathic varieties.Interactions between allelochemicals and C/N ratio in rice plants were also analyzed.Results show that the growth of both varieties was enhanced significantly.In Treatments LN(lower nitrogen level) the C/N ratio in the plants increased in elevated CO2,while in Treatments HN(high nitrogen level) it did not alter much.The total content of secondary metabolic material and characteristic allelochemicals of the rice plants of allelopathic variety also increased significantly,but such increment did not occur in rice plants of normal variety.C/N ratio of rice of allelopathic variety was positively correlated with contents of secondary metabolic materials and of characteristic allelochemicals as well.