珍稀濒危植物海南粗榧幼苗天然更新与环境因子的灰色关联分析

以1996—2005年观测数据为基础,运用灰色系统理论和方法,分析环境因子对海南粗榧种群内的海南粗榧植株各林龄存活率、幼苗高度增加比、幼苗高度增加值的影响。结果表明:年最高温度对各种群海南粗榧幼苗的存活率影响最大,年最低温度对各种群海南粗榧幼苗的植株高度年增加值影响最大,而土壤的厚度及湿度严重影响了海南粗榧幼苗的生长。因此,在保护海南粗榧野生种群的生长过程中,应注意其生长环境(主要是温度及土壤)对植株的影响,以便提高幼苗的存活率并改善植株生长状况。

Gray Relational Analysis on Natural Regeneration of Rare and Endangered Species Cephalotaxus mannii Hook.f.and Environment Factors

Using gray relational system theory and method,the effects of environment factors on the survival rate,the increasing height and the increasing height ratio of seedling populations of Cephalotaxus mannii in Hainan island were analysed based on the observed data of 1996 to 2005.The results showed that temperature and soil of habitats were the most important environment factors for the natural regeneration of seedlings of C.mannii.The most significant influential environmental factors which respectively affected the survival rate and the increasing height of seedlings of C.mannii were annual highest temperature and annual lowest temperature.Thickness and moisture of soil also expressed great effects on the growth of seedlings of C.mannii.Therefore,temperature and soil in the environment factors should be paid much more attention during protecting C.mannii in wild in order to increase seedling survival rate and improve plant growth conditions.