大气CO2浓度升高对大豆生长和产量的影响

通过开顶式气室控制大气CO2浓度，对大豆生长和产量指标进行实验测定，研究了大气CO2浓度升高对大豆株高、茎粗、叶片性状和产量构成因素的影响，分析了未来高CO2条件下大豆生长和产量的变化趋势。结果表明，与背景大气CO2浓度350μmol/mol相比，大气CO2浓度为550和750μmol/mol时，大豆株高分别提高15.74%和21.57%，茎粗则增加8.62%和13.79%。大豆比叶重在不同生育期平均提高3.50%和7.25%，大豆鼓粒期叶面积增加7.27%和14.08%，叶绿素含量提高7.10%和11.42%。高CO2浓度对大豆产量各构成因子的贡献存在差异，对单株荚数提高幅度较大，分别为6.87%和11.61%，促使产量增加15.19%和29.10%。

Effects of Elevated Atmospheric CO2 Concentration on Growth and Yield of Soybean

The plant height, stem diameter, leaf area, specific leaf mass, chlorophyll content and yield components of soybean under ambient and elevated CO2 levels were measured, and their responses to elevated CO2 were analyzed. The results showed that plant height increased by 15.74% and 21.57% under elevated (550 and 750μmol/mol)CO2, compared to the ambient air CO2 concentration. The stem diameter increased by 8.62% and 13.79%. At the same time, the leaf area increased by 7.27% and 14.08% with air CO2 enrichment at grain filling stage. The pod Number per plant increased 6.87% and 11.61%, and seed weight per pot increased 15.19% and 29.10% in two high CO2 levels.