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Natural Variation in Seed Characteristics of Eastern White Pine (Pinus strobus L.)

机译：东部白松（Pinus strobus L.）种子特性的自然变化

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摘要

Natural variation in seed characteristics of eastern white pine (Pinus strobus L.) trees and its relationship with the size, form, and crown class of parent trees was examined in second-growth, white pine mixedwood stands in Ontario. Cones were collected prior to and following partial harvesting of two stands during 2 years of above-average seed production. Fully enlarged seed extracted from mature cones was X-rayed to determine seed yield per cone, the percentage of sound, partially filled, and empty seed, and the sound seed mass for each tree. Variation in seed yield per cone, the proportion of sound, partially filled, and empty seed, and seed mass was much greater among individuals than between stands or seed years. The strength and significance of the relationship of seed mass with sound seed yield differed with stand and seed year. In uncut stands, seed mass was higher for trees with dominant crown class, larger live crown ratios, and smaller height to diameter ratios, suggesting tree vigour and microsite quality influence seed mass. Proportion of partially filled seeds was significantly reduced in both stands in the second year likely due to increased growing degree days during female gametophyte development. The implications of these results to natural and artificial regeneration of white pine are discussed.
机译：在安大略省第二生长的白松混材林中，研究了东部白松（Pinus strobus L.）树种子特性的自然变化及其与亲本大小，形态和冠类的关系。在种子产量高于平均水平的2年中，在部分收获两个林分之前和之后，收集了锥体。对从成熟视锥中提取的完全膨大的种子进行X射线分析，以确定每个视锥的种子产量，声音，部分填充和空种子的百分比以及每棵树的声音种子质量。个体之间的种子密度，每穗的种子产量，有声种子，部分填充种子和空种子的比例以及种子质量的变化比林分或种子年之间的差异要大得多。种子质量与良种产量关系的强度和意义随林分和种子年的不同而不同。在未砍伐的林分中，具有优势树冠等级，较大的活树冠比率和较小的高度与直径比率的树木，种子质量较高，表明树木的活力和微场所质量会影响种子质量。第二年，两个支架的部分填充种子的比例均显着降低，这可能是由于雌配子体发育过程中生长日数的增加所致。讨论了这些结果对白松的自然和人工再生的影响。

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