论文部分内容阅读
利用呼伦贝尔草原 2个组 8个站点的 33个变量进行了逐步判别分析。结果表明 ,影响沙地樟子松天然更新的生态气候因子主要是极端最低气温、极端最高地温、1月蒸发量和多年平均积雪日数等 4个 ,它们主要是通过对种子萌发和幼苗的生长发育施加限制作用。因此 ,在造林生产实践中应选择适宜的立地克服其消极影响 ,必要时应采取人工措施促使其天然更新 ,保障其持续稳定发展。
A stepwise discriminant analysis was conducted using 33 variables from 8 sites in 2 groups of Hulunbuir grasslands. The results showed that the ecological climatic factors affecting the natural regeneration of Pinus sylvestris var. Mongolica were mainly the extreme minimum temperature, the extreme maximum ground temperature, the evaporation in January and the average number of snow days for many years. They mainly contributed to the seed germination and seedling growth Exert a restrictive effect on development. Therefore, in the afforestation production practice, we should choose a suitable site to overcome its negative impact, if necessary, we should take artificial measures to promote its natural regeneration, to ensure its sustainable and stable development.