The relation between growth cessation and frost hardening in Scots pines of different origins
The relation between growth cessation and frost hardening in Scots pines of different origins
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DOI：
10.1007/s004680000059
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发表时间：
2000-08-01
影响因子：
2.3
通讯作者：
Vuorinen, M
中科院分区：
文献类型：
--
作者：
Repo, T;Zhang, G;Vuorinen, M
以樟子松种源8年生试验为材料，比较了不同冻融处理对樟子松新梢伸长、直径生长和针叶伸长的影响，以及不同冻融处理对樟子松茎和针叶开始冻硬的影响。建立在芬兰中部芬兰中部。这些树苗有六个不同的起源，从爱沙尼亚到北方芬兰，形成了大约1000米的纬度梯度。北纬10度通过电阻抗分析和电解质渗漏和损伤的视觉评分来评估当年枝条的茎和当年针叶的抗寒性。在评估中使用了人工冷冻试验。生长停止的模式（枝条和针叶伸长，直径生长）往往遵循原产地的纬度，即生长停止在最北的种源第一和最南的一个最后。北方种源的茎和针叶硬化早于南方种源，但随着硬化的进行，抗寒性的差异消失。生长停止和最初硬化到-15摄氏度在种源水平上明显相关，表明生长必须在硬化之前停止，并且生长停止越早，茎和针叶的霜冻硬化越早。在8月生长末期，种源水平的茎的抗寒性没有差异。此时，最北种源针叶的抗寒性高于其他种源。在种源内，茎比针叶的耐寒性差哈代。
The cessation of shoot elongation, diameter growth and needle elongation were compared with the initiation of frost hardening of the stems and needles in an 8-year-old provenance trial of Scots pine (Pinus sylvestris L.) established in central Finland. The saplings were of six different origins ranging from Estonia to northern Finland, forming a latitudinal gradient of ca. 10 degrees N. The frost hardiness of the stems of current-year shoots was assessed by electrical impedance analysis and that of current-year needles by electrolyte leakage and visual scoring of damage. Artificial freezing tests were used in the assessments. The pattern of growth cessation (shoot and needle elongation, diameter growth) tended to follow the latitude of origin, i.e. growth ceased in the northernmost provenance first and in the southernmost one last. Both stems and needles of the northern provenances hardened earlier than the southern ones, but the differences in hardiness disappeared as hardening progressed. Growth cessation and initial hardening to -15 degrees C were clearly correlated at the provenance level, indicating that growth must cease prior to hardening, and that earlier cessation of growth predicts earlier frost hardening of stems and needles. No differences in frost hardiness of stems were found at the provenance level at the end of the growing period in August. At that time, the frost hardiness of needles of the northernmost provenance was higher than that of other origins. Within the provenance, the stems were less hardy than the needles.