白刺属植物生长效益的数值分析

根据分布于甘肃省的5种白刺属植物的17项生长效益指标数据，应用回归分析、方差分析和多重比较方法进行了数值分析，结果表明：种子千粒质量与干果千粒质量，幼苗平均地径与直播造林出苗率及成苗（活）率之间，具较强的正相关性。主根长与生根生长率和容器苗高生长量之间的负相关性较强。种间生长效益差异显著。在相同的生长环境条件下，5种白刺生长效益高低顺序为大果白刺(Nitraria roborowskii)、小果白刺(N. sibirica)、唐古特白刺(N. tangutorum)、毛瓣白刺(N. praevisa)和泡果白刺(N. sphaerocarpa)。

Numerical analysis on the growth benefits of the genus Nitraria

：In this paper, the growth benefits of 5 species of the genus Nitraria enisting in Gansu province were studied according to 17 indexes. The numerical analyses were performed using regression analysis, variance analysis and multiple comparison method. The results suggested that the positive correlation coefficients between seed weight and fruit weight, between diameter of seedling stem and rate of emergence and survival were higher, and there was strong negative correlation between length of main-root and growth rate, seedling height. There was significant variance among species. Under the same situation, the growth benefit decreased in order as follows: Nitraria roborowskii , N. sibirica, N. tangutorum, N. praevisa and N. sphaerocarpa.