油松抗寒性与种源关系的研究

Research on the Relation between the Cold Resistance and Provenance of Chinese Pine

以人工冰冻和电导法测定了油松种源试验林中不同生态型林木针叶的抗冻性及其季节变化。结果表明,油松不同气候生态型之间,在11月初已有显著的差异,东北型抗冻性最强,其次是中部型、东部型、西北型,再次是中西型、西南型,最差的是南部型。到仲冬时节,各生态型的抗冻性普遍增强,但彼此之间的差别减小。到早春,各生态型的抗冻性大为减弱,并且彼此之间的差别消失。对抗冻性与原产地的地理位置的相关分析表明,纬度越高,经度越大,抗冻性越强。在我们采用的气候指标中,与抗冻性关系最大的是一月平均温,即低温季节的温度状况对于抗冻性的形成更有意义。

The cold resistance of Chinese pine (Pinus tabulaeformis) needles of different ecological types and its seasonal changes have been determined with artificial freezing method and conductometry. An evident difference in cold resistance among different ecological types has been observed. The analysis of relationship between cold resistance and geographic location of provenance shows that the cold resistance of Chinese pine becomes greater and greater with the latitude moving northward. In all climatic elements, the cold resistance is closely related to the monthly mean temperature of January, in particular, that is, the temperature of cold season has more important effect on the formation of cold resistance