Tree growth and competition in a Betula platyphylla-Larix cajanderi post-fire forest in central Kamchatka
Tree growth and competition in a Betula platyphylla-Larix cajanderi post-fire forest in central Kamchatka
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DOI：
10.1093/aob/mch149
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发表时间：
2004-09-01
期刊：
影响因子：
4.2
通讯作者：
Hara, T
中科院分区：
文献类型：
--
作者：
Dolezal, J;Ishii, H;Hara, T
火是堪察加半岛北部森林的主要干扰，方法在53年生火烧迹地的0.4公顷样地内，随机选择225株1 -3 m高的乔木1433株，测定其年径向生长量，研究林分的空间分布特征。在建立，生长，大小不等的时间变化和个体之间的竞争模式。生长变化与树木的大小，年龄和当地的干扰与neighbors.Key Results白桦形成的主要冠层火灾后，在1947年，落叶松cajanderi和白松逐步reinvading较低的树木和灌木层。大多数B。在火灾后的第一个15年里，扁叶植物起源于小块土地上的新芽（polycormons）。白桦的直径和年龄级的正态分布，但负偏态的高度分布，如预期的不耐荫，先锋种。高个体少，矮个体多。更小更年轻的B。从1950年到1975年，阔叶树的直径比大树的直径大得不成比例，因此树干大小的不平等减少了。1995年至2000年观察到相反的趋势：较大的树木生长得更多，表明对光线的竞争越来越不对称。白桦在火灾后的前25年中直径生长稳定，之后较小的树木生长下降。邻里分析表明，下降导致从更高的neighbors.Conclusions的竞争增加所观察到的生长模式表明，在林分发展过程中的相互作用模式改变从早期阶段的弱竞争的土壤资源火释放到后期阶段的不对称竞争的光。不对称的树冠竞争开始晚于其他研究中报道的，这可以归因于较低的干密度留下了很大的空间，为个人的增长，更大的相对重要性，在这个网站的营养贫乏的火山岩土壤，和植物起源的B地下竞争。阔叶树。落叶松生长在B.阔叶树直径生长在前20年稳定，之后生长下降。这表明，早期的演替符合耐受模式的演替，而抑制占主导地位的后期阶段。(C)2004年《植物学年鉴》（Annals of Botany Company）
Background and Aims Fire is the dominant disturbance in central Kamchatka boreal forests, yet patterns and mechanisms of stand recovery have not been investigated.Methods Measurements were made of 1433 stems greater than or equal to1-3 m height and annual radial increments of 225 randomly selected trees in a 0.4-ha plot of a 53-year-old fire-origin mixed-species stand to examine the spatio-temporal variation in establishment, growth, size inequality and the mode of competition among individual trees. Growth variations were related to tree size, age and local interference with neighbours.Key Results Betula platyphylla formed the main canopy following a fire in 1947, with Larix cajanderi and Pinus pumila progressively reinvading the lower tree and shrub stratum. Most B. platyphylla originated from sprouts in small patches (polycormons) during the first 15 post-fire years. Betula platyphylla had normal distributions of diameter and age classes, but negatively skewed height distribution, as expected from shade-intolerant, pioneer species. Larix cajanderi had fewer tall and many short individuals. The smaller and younger B. platyphylla grew disproportionately more in diameter than larger trees from 1950 to 1975, and hence stem size inequalities decreased. The reverse trend was observed from 1995 to 2000: larger trees grew more, indicating an increasing asymmetry of competition for light. Betula platyphylla had steady diameter growth in the first 25 post-fire years, after which the growth declined in smaller trees. Neighbourhood analysis showed that the decline resulted from increased competition from taller neighbours.Conclusions The observed growth patterns suggest that mode of interactions altered during stand development from early stages of weak competition for soil resources released by fire to later stages of asymmetric competition for light. Asymmetric crown competition started later than reported in other studies, which can be attributed to the lower stem density leaving much space for individual growth, greater relative importance of below-ground competition in this site of nutrient-poor volcanic soil, and the vegetative origin of B. platyphylla. Larix cajanderi growing under B. platyphylla had steady diameter growth during the first 20 years, after which growth declined. It is suggested that early succession fits the tolerance model of succession, while inhibition dominates in later stages. (C) 2004 Annals of Botany Company.