Age and size effects on seed productivity of northern black spruce
Age and size effects on seed productivity of northern black spruce
复制标题
年龄和大小对北方黑云杉种子生产力的影响
DOI：
10.1139/cjfr-2013-0022
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发表时间：
2013
影响因子：
2.2
通讯作者：
J. Johnstone
中科院分区：
文献类型：
--
作者：
J. Viglas;Carissa D. Brown;J. Johnstone
北方针叶林生长缓慢的针叶树可能需要几十年才能达到生殖成熟，使它们容易受到干扰频率增加的影响。在这里，我们研究了林分年龄和种子生产力之间的关系，黑云杉（Picea mariana（Mill.）（布里顿、萨金特和波根布）在育空地区和阿拉斯加。黑云杉树的年龄和调查的球果生产和种子活力在30个均匀年龄的立场，从12岁到197岁。Logistic回归分析表明，30年生时，单株产生球果的概率为50%左右，100年生时增加到90%。球果和种子产量随着年龄或断面积在树和林分水平稳步增加，没有证据表明，在150年以上的树木种子产量下降。使用公布的种子：幼苗比例，我们估计，火灾后的招聘将受到种子可用性的限制，在看台上长达50年（高质量的苗床）至150年（低质量的苗床）。
Slow-growing conifers of the northern boreal forest may require several decades to reach reproductive maturity, making them vulnerable to increases in disturbance frequency. Here, we examine the relationship between stand age and seed productivity of black spruce (Picea mariana (Mill.) Britton, Sterns & Poggenb.) in Yukon Territory and Alaska. Black spruce trees were aged and surveyed for cone production and seed viability across 30 even-aged stands ranging from 12 to 197 years old. Logistic regression indicated that individual trees had a ∼50% probability of producing cones by age 30 years, which increased to 90% by age 100 years. Cone and seed production increased steadily with age or basal area at both the tree and stand level, with no evidence of declining seed production in trees older than 150 years. Using published seed:seedling ratios, we estimated that postfire recruitment will be limited by seed availability in stands for up to 50 years (on high-quality seedbeds) to 150 years (low-quality seedbe...