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加拿大一枝黄花种子可以通过风传播扩散,其地下根茎可以进行无性克隆,具有极强的繁殖能力。为探讨加拿大一枝黄花生长及繁殖规律,2006—2008年在杭州下沙国家级经济开发区内对自然生长状态下不同密度的加拿大一枝黄花定点进行调查,结果表明:90～120株.m-2的高密度状况下,植株平均株高高于其他密度,最大的差距为57.6cm;60～80株.m-2的中密度下,茎粗最大,达到10.3mm,比低密度条件下平均值粗2mm;中密度条件下加拿大一枝黄花叶片的增长数最多,平均日增长量最多达3.4片;高密度时加拿大一枝黄花最早开花,分别比中密度、低密度条件下提前约8和3d;高密度条件下种子扩散的时间最早,分别比中密度、低密度条件下提前约7和2d;中密度条件下平均每株产生种子数量最多,平均种子量达到77896颗.株-1,且种子的发芽率最高。本研究明确了自然生长状况下加拿大一枝黄花的营养及繁殖生长特性,可为加拿大一枝黄花的防控措施的制定提供科学依据。
Solidago canadensis seeds can spread through the wind, the underground rhizome clones can be cloned, with strong reproductive capacity. In order to explore the law of growth and propagation of Solidago canadensis, we investigated the natural density of Solidago canadensis in 2006-2008 in Xiasha National Economic Development Zone in Hangzhou. The results showed that 90-120 strains of m-2 Under the condition of high density, the average plant height of the plants was higher than other density, the biggest difference was 57.6cm; under the middle density of 60 ~ 80 plants .m-2, the stem diameter was the largest, reaching 10.3mm, 2mm. Under the condition of medium density, the Solidago canadensis leaf had the most growth and the average daily increment was up to 3.4. Solidago canadensis first flowered at high density, which was 8 and 3 d ahead of the medium density and low density, respectively. The high density The earliest seed dispersal time under medium and low density conditions was about 7 and 2 days respectively; the average number of seeds per plant under medium density condition was 77896. Plant-1, and seed germination The highest rate. This study made clear the nutrition and reproductive growth characteristics of Solidago canadensis in the condition of natural growth, which could provide a scientific basis for the prevention and control measures of Solidago canadensis.