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北京地区的小麦在平均亩产突破300公斤之后,要继续高产稳产,极需进一步地改善品种的产量潜力。本研究将叶面积指数(LAI)、光截获(LI)、光衰减系数(?)、叶面积持续时间(LAD)、干物质积累(DMA)、作物生长速度(CGR)等性状与冠层形成联系起来,研究它们与产量的关系。几年来,通过7个高产品种的14个冠层参数对籽粒产量的相关、通径、多元回归分析,确定了开花——成熟的 LAD,返青——开花的(?)和开花期冠层顶——地表的(?)等3个重要参数,它们可以解释产量变异的91.2%。这些结果表明,要获得亩产400公斤左右的高产,从返青到开花必须使冠层尽快覆盖地面;在开花期应改善冠层叶片的空间排列,以截获更多的有效光合辐射;在本麦区允许的条件的范围之内,在开花到成熟阶段争取较长的绿色面积持续时间。以上结果对高产育种和高产栽培极有参考价值。
After the average yield of wheat in Beijing exceeded 300 kg per mu, it is necessary to continue high-yielding and high-yielding. It is very necessary to further improve the yield potential of the varieties. In this study, leaf area index (LAI), light interception (LI), light attenuation coefficient (?), Leaf area duration (LAD), dry matter accumulation (DMA), crop growth rate (CGR) Link them to study their relationship with production. In recent years, through the correlation analysis of 14 canopy parameters of seven high-yielding cultivars to the grain yield, path analysis and multivariate regression analysis, the flowering-maturity LAD, greening-flowering (?) And flowering canopy - surface (?) And other three important parameters, they can explain the yield variation of 91.2%. These results show that to obtain a yield of about 400 kg per mu, the canopy must be covered as soon as possible from greening to flowering; the spatial arrangement of the canopy leaf should be improved at the flowering stage in order to intercept more effective photosynthetic radiation; The area allows the conditions within the range, in the flowering to maturity stage for longer green area duration. The above results for high-yielding breeding and high-yield cultivation of great reference value.