CO_2浓度倍增对大豆叶片和总生物量的影响研究

A STUDY OF IMPACTS OF CO_2 CONCENTRATION DOUBLING ON SOYBEAN LEAF DEVELOPMNT AND BIOMASS

该文利用ＯＴＣ－１型开顶式气室中进行的ＣＯ＿２浓度倍增对大豆影响的试验资料，详细分析了当大气中ＣＯ＿２浓度倍增时，对大豆叶片和总生物量的影响情况，并对大豆总生物量的时间动态变化进行了模拟。结果表明，当大气中ＣＯ＿２浓度倍增时，大豆全生育期将缩短，３叶和分枝的ＤＶＳ值变大，而结荚和鼓粒的ＤＶＳ值变小；总生物量和绿叶重增加显著，但在同一个ＤＶＳ值时，绿叶率（ＧＲ）、黄叶率（ＹＲ）的差异不明显；大豆的总生物量变化均遵循自然增长曲线，且处理和对照有极好的线性正相关关系；总生物量的积温当量提高，并且使大豆总生物量的最大积温当量出现的时间推迟，有利于植株积累更多的营养物质。

The impacts of atmospheric CO_2 concentration doubling on soybean leafdevelopment and total biomass are analysed in detail by using the data concerned withCO2 doubling experiment in OTC-1 open top chamber, and the time-dynamics variationof total soybean biomass is simulated.The resuIts show that when the CO_2 concentrationdoubling,the soybean growing period would be shortened. The developmental stagevalue (DVS)at the stage of 3-real leaf and branch stem would be greater,but at pod andbulge kernel stage would be smaller;the weight of total biomass and green leaf wouldbe increased remarkably, but at the same DVS,the differences of GR and YR are notsignificant;the change of total biomass is coincided with the natural increasing curve,and the correlation between treatment(2CO_2) and contrast(CO_2) is positive;and thatthe accumuldted temperature equivalent of total biomass would be increased,and theappearance time of greatest equivalent would be postponed. It is u,efuI to accumulatemore nutrient substance.