论文部分内容阅读
桂花是原产我国的十大传统名花之一,而且是我国特有的香料植物。它主要分布在我国的亚热带地区,其花的产区大部分集中在长江流域。限制桂花在北方分布的主要气候因素是冬季的低温,一月份平均气温低于2℃的地区,越冬就需特殊管理。桂花在开花前需要一段5～6小时/日的短日照时期。桂花适宜于气候比较湿润的环境,各主要产区的年干燥度系数都小于1,但花期雨多会严重影响其产量和品质。桂花的叶片对 SO_2、HF 和 Cl_2等污染气体的抗性较强,但其花芽对烟尘却比较敏感,所以在工业城市的园林中有只长叶而不开花的现象。
Osmanthus fragrans is one of the ten famous traditional flowers native to China, and is a unique fragrant plant in China. It is mainly distributed in China’s subtropical regions, most of its flowers are concentrated in the Yangtze River Basin. The main climatic factor that limits the distribution of sweet-scented osmanthus in the north is the low temperature in winter, and the average temperature in January is lower than 2 ℃. Winter over-winter requires special management. Osmanthus takes a short period of 5 ~ 6 hours / day before flowering. Osmanthus fragrans is suitable for the humid climate, the annual dryness coefficient of all the major producing areas is less than 1, but the flowering period will seriously affect its yield and quality. Osmanthus fragrans leaves on the SO2, HF and Cl2 and other polluted air resistance is strong, but its flower buds are more sensitive to dust, so in the industrial city gardens have only long leaves without flowering phenomenon.