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采用14份柳枝稷开展盆栽试验,研究了在北京地区条件下其生物量差异及分配规律。结果表明,低地型柳枝稷Kanlow生物量最高,其茎秆、地上部和整株生物量分别达到175.48 g/株、299.18 g/株和447.66 g/株,而高地型柳枝稷Nebraska生物量最低,其茎秆、地上部和整株生物量分别为29.86 g/株、58.08 g/株和140.51 g/株。就柳枝稷整株植株而言,Kanlow地上部生物量分配比例最高,达到63.13%,S2最低,为40.55%,Kanlow地上部营养器官生物量分配比例最高,达到48.67%,Nebraska最低,为31.88%。就柳枝稷地上部而言,Alamo、Kanlow和Trailblazer茎秆生物量分配比例及茎叶比均较高,分别为35.91%和2.75,37.09%和2.56,34.39%和2.48。起源纬度显著影响了柳枝稷的生物量及其分配,就柳枝稷整株植株而言,起源纬度与柳枝稷生物量显著负相关,与地下部生物量分配比例显著正相关,与地上部、种子和茎生物量分配比例显著负相关。就柳枝稷地上部而言,起源纬度与茎生物量分配比例及茎叶比显著负相关,与叶和鞘生物量分配比例显著正相关。生物量的差异及其分配规律反映出柳枝稷对生态环境长期适应的生殖与生长策略。本研究为柳枝稷遗传资源引种和品种选育提供了依据。
Pot experiment was carried out with 14 parts of switchgrass and the biomass and distribution rules under Beijing conditions were studied. The results showed that the lowland-type switchgrass Kanlow had the highest biomass with the biomass of stems, shoots and whole plant reaching 175.48 g / plant, 299.18 g / plant and 447.66 g / plant respectively, while that of highland-type switchgrass Nebraska was the lowest. The biomass of culm, shoot and whole plant were 29.86 g / plant, 58.08 g / plant and 140.51 g / plant, respectively. For the whole plant of switchgrass, Kanlow had the highest proportion of above-ground biomass allocation, reaching 63.13% and S2 lowest, accounting for 40.55%. The biomass distribution of vegetative organs in Kanlow was the highest (48.67%) and Nebraska was the lowest (31.88%). For the shoots of switchgrass, the biomass allocation ratio and stem-leaf ratio of the Alamo, Kanlow and Trailblazer stalks were both 35.91% and 2.75, 37.09% and 2.56, 34.39% and 2.48, respectively. The origin latitude significantly affected the biomass and distribution of switchgrass. For the whole plant of switchgrass, the origin latitude was significantly negatively correlated with the switchgrass biomass, and significantly positively correlated with the biomass allocation in the subsurface, A significant negative correlation was found between the proportions. In the case of switchgrass, there was a significant negative correlation between the origin latitude and stem biomass allocation and stem-leaf ratio, and a significant positive correlation with leaf and sheath biomass allocation. The differences in biomass and their distribution reflect the long-term adaptation of switchgrass to reproductive and growth strategies. This study provided the basis for the introduction and variety selection of switchgrass genetic resources.