西部铁杉(Tsuga heterophylla)个体受精反应与社会地位和树冠特征的关系

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Woongsoon Jang, B. Eskelson, K. Littke, E. Turnblom
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引用次数: 0

摘要

由于西部铁杉(Tsuga heterophylla (Raf.) Sarg.)林分对施肥的生长响应变化很大,因此一直被认为是无响应或不一致的。我们利用来自美国和加拿大的大量数据集,为西部铁杉构建了树木级别的施肥反应模型,以澄清不一致的林分级别反应。使用广义线性和非线性混合效应模型,通过施肥、立地和树木水平变量来评估树木直径和高度的增长以及死亡率。西部铁杉的施肥反应不仅受林地变量和施肥量的影响,还受树木社会地位和树冠特征的影响。树木的优势地位和树冠比越大,对高度增长的反应就越大,但对直径增长的反应就越小。施肥对直径增长的影响在施肥三年后达到峰值,而对高度增长的影响在施肥六年后达到峰值。施肥增加了总体死亡率,但也改善了受抑制树木和稳定生长树木的死亡率。西部铁杉这些复杂的施肥反应可能意味着它在特定大小和社会地位下的耐受性和资源分配策略。这些结果突显了采用树级建模方法的重要性,以更好地了解西部铁杉如何对施肥做出反应,提高施肥后生长和产量预测的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Individual Fertilization Response with Social Status and Crown Characteristics for Western Hemlock (Tsuga heterophylla)
Due to their high variability, the growth responses of western hemlock (Tsuga heterophylla (Raf.) Sarg.) stands to fertilization have been regarded as unresponsive or inconsistent. Tree-level fertilization response models for western hemlock were constructed to clarify the inconsistent stand-level responses, using extensive datasets from the United States and Canada. Tree growth in diameter and height, mortality, were assessed by fertilization, stand- and tree-level variables using generalized linear and non-linear mixed effects models. Western hemlock fertilization response was influenced not only by stand-level variables and application rates but also by tree social status and crown characteristics. Greater dominance and crown ratio in trees increased height growth responses but decreased diameter growth. The peak of fertilization effect on diameter growth was observed three years after application, while effect on height growth peaked at six years. Fertilization increased the overall mortality rate, but also ameliorated it for suppressed and steady-growing trees. These complicated fertilization responses of western hemlock may imply its tolerance and allocation strategy of resources at a given size and social status. The results highlight the importance of adopting a tree-level modelling approach to better understanding how western hemlock trees respond to fertilization, improving the accuracy of growth and yield prediction after fertilization.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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