大叶樟苗木的高生长及与环境因子的相关

THE HEIGHT GROWTH OF CINNAMOMUM PLATYPHYLLUM SEEDLINGS AND ITS CORRELATIONS WITH ENVIRONMENTAL FACTORS

樟树是我国的珍贵树种,也是亚热带常绿阔叶林的代表种。樟树树姿秀丽、四季常青、且具芳香,近年被广泛选作南方城镇及“四旁”绿化树种。大叶樟(Cinnamomum platyphyllum)与本地香樟相比,具有生长期长、生长量大、耐寒性较强等优点,在江浙一带引种已初获成功。为了能使这一优良树种更快地推广繁殖,本文对其一年生播种苗的高生长规律、生长与环境因子的相关性进行了探讨,为培育优质壮苗提供科学依据。

The results of investigation showed that: there existed obviously a 'slow-fast-slow' growth rhythm in height growth process of one-year-old Cinnamomum platyphyllum seedlings. This growth process could be simulated with Logistic curve. The different growth stages could be divided with derivating the Logistic equation. There was a positive correlation between rate of height growth and rate of leaf area increament. The nitrogen (N) content in leaf of the seedlings was the first important for height growth, phosphorus (P)content was the second, and then was potassium(K). The growth rate of height was closly related to air temperature. Proper shading, irragating in time as well as solving the contradictions between the supply and demand for water, fertilizer and temperature at the fast growth stage were the key techniques for growing good saplings.