九种下加利福尼亚灌木物种的叶片物候学和叶片光谱学的种内和种间差异

IF 1.1 4区 生物学 Q3 PLANT SCIENCES
Anaid Rodríguez Bastarrachea, Samantha D. Díaz de León, Stephen H. Bullock, Miguel Ángel Alonso Arévalo, R. Méndez-Alonzo
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引用次数: 0

摘要

背景:树冠物候学、叶片生物化学和叶片寿命在物种内和物种间随季节而变化。从本质上讲,这种变化也应决定叶片组织光谱特性的变化。然而,在季节性干旱地区,树冠物候和叶片光谱是否在不同物种间共同发生变化,还很少有人进行过测试。问题和/或假设:我们测试了生长率、叶片物候和叶片光谱指数之间的协变关系,预计生长率高的物种在相对叶片数和叶片光谱方面应该有很大的变异性。研究物种/数据描述/数学模型:我们对 9 个多年生矮灌木物种的相对叶片数和光谱的种内和种间变异进行了划分。研究地点和日期:下加利福尼亚州瓜达卢佩山谷的埃尔莫戈牧场,2017 年和 2018 年。研究方法用相对叶片数指数对叶片物候进行量化,用三个标准植被指数对叶片光谱进行量化,用茎干生长和叶片功能特征对资源利用进行量化。结果叶片物候变化较大的物种(落叶较多的物种)茎干生长率较高。三种植被指数在不同物种间存在显著差异(约占解释方差的 20%),在物种内不同季节也存在显著差异(约占解释方差的 55%)。三个植被指数的值是相关的,只有 NDVI 与叶片物候和茎干生长相关。结论我们的研究结果表明,在季节性干旱环境中,灌丛物种相对叶片数和光谱的变化与物种参与资源开发战略的功能特征有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intra and interspecific variation in foliage phenology and leaf spectroscopy in nine Baja Californian shrub species
Background: Canopy phenology, foliar biochemistry, and leaf lifespan vary according to season within and across species. Intrinsically, this variation should also determine changes in the spectral properties of foliar tissue. However, whether canopy phenology and leaf spectroscopy co-vary across species has seldom been tested in seasonal drylands. Questions and / or Hypotheses: We tested the covariation between growth rate, foliage phenology, and leaf spectral indices, expecting that species with high growth rates should have large variability in relative leaf number and foliar spectroscopy. Studied species / data description / Mathematical model: We partition the intra and interspecific variation in relative leaf number and spectroscopy within nine perennial chaparral shrub species. Study site and dates: Rancho El Mogor, Valle de Guadalupe, Baja California, during 2017 and 2018. Methods: Foliage phenology was quantified with an index of relative leaf number, foliar spectroscopy with three standard vegetation indices, and resource-use with stem growth and leaf functional traits. Results: Species with higher variability in foliage phenology (more deciduous species) had higher stem growth rates. The three vegetation indices varied significantly across species (ca. 20 % of explained variance), and across seasons within species (ca. 55 % of explained variance). The values of the three vegetation indices were correlated, and only NDVI was correlated with foliage phenology and stem growth. Conclusions: Our results show that variations in relative leaf number and spectroscopy in chaparral species are coupled with functional traits of species involved in resource exploitation strategies in a seasonally arid environment.
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来源期刊
Botanical Sciences
Botanical Sciences Agricultural and Biological Sciences-Plant Science
CiteScore
1.90
自引率
21.40%
发文量
71
审稿时长
16 weeks
期刊介绍: Botanical Sciences welcomes contributions that present original, previously unpublished results in Botany, including disciplines such as ecology and evolution, structure and function, systematics and taxonomy, in addition to other areas related to the study of plants. Research reviews are also accepted if they summarize recent advances in a subject, discipline, area, or developmental trend of botany; these should include an analytical, critical, and interpretative approach to a specific topic. Acceptance for reviews will be evaluated first by the Review Editor. Opinion Notes and Book Reviews are also published as long as a relevant contribution in the study of Botany is explained and supported.
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