不同向日葵品种群体光合生理参数及产量比较

Comparative study of physiological parameter and grain yield on different sunflower hybrid populations

以3个向日葵品种为材料,通过两年的田间试验研究向日葵群体的光合生理特征。结果表明,向日葵群体的叶面积指数(LAI)增长极快,出苗后第51d前后即达到最大值(LAImax)3.57～5.64。群体光合势与生物产量和子实产量呈极显著正相关。平均净光合率因品种和年份而异,范围在5.08～7.02g/m2.d。生物产量积累动态趋势为"慢-快-慢",符合Logistic方程。生物产量在各个器官中的分配比例一般为:茎秆(或子实)>子实(或茎秆)>叶片>葵盘>叶柄,子实所占比例即经济系数两年平均为29.7%和34.4%,因年份而异。早熟品种的经济系数大于中早熟和中熟品种。

Field experiment was conducted to study the physiological parameter and grain yield on 3 sunflower hybrid populations.Result showed that leaf area index were developed very fast.The time of the max leaf area index were at 51d after seedling emergence.The leaf area index varied with different sunflower hybrids with a range of 3.57~5.64.Biological yield and grain yield had significant positive correlation with the photosynthesis potential of the population.The average net photosynthetic rates were 5.08 to 7.02g/m2·d,and varied with different sunflower hybrids and years.The trends of biological yield accumulation were ＂fast-slow-fast＂,and conformed to the Logistic equation model.Distribution ratio of biomass in various organs was stem（grain）grain（stem）leafheadpetiole.The average percentages of grain（economical index） were 29.7% and 34.4% in two years.The economical index of early maturity sunflower was higher than that of middle maturity sunflower.