俄克拉何马州高草草原保护区紫锥菊种群形态特征的时间变化

Q2 Environmental Science

Open Ecology Journal Pub Date : 2011-07-22 DOI:10.2174/1874213001104010001

J. Arévalo, Adam K. Ryburn, Soni Jaiswal

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引用次数: 0

摘要

对俄克拉何马州高草草原保护区紫锥菊(Echinacea pallida)种群结构和时空变化进行了分析。在1997-1998年、1998-1999年和1999-2000年3个时期，根据植物的总叶长和过渡概率将植物划分为不同的类别，并用于确定时间变化。对三个时期不同规模类别之间的转移概率的分析使我们能够区分转移概率矩阵。单变量空间分析显示，在大于40 cm的大多数距离上，个体聚集显著;0 ~ 40 cm茎秆的空间分布与随机分布无显著差异(p < 0.05)。从研究期的第1年到第4年，聚集性有所增加，这似乎与密度增加有关。虽然我们没有一个对照点，但两年前燃烧的结果强烈表明火灾对种群动态的影响。

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Temporal Changes in Morphological Traits in a Population of Echinacea pallida in the Tall Grass Prairie Preserve, Oklahoma

We analyzed the structure and spatial temporal changes of a population of Echinacea pallida in the Tall Grass Prairie Preserve of Oklahoma. Plants were classified into different categories based on total leaf length and transition probabilities for three periods (1997-1998, 1998-1999, 1999-2000) and were used to determine temporal changes. The analysis of transition probabilities among different size classes for the three periods allowed us to discriminate the transition probabilities matrices. A univariate spatial analysis of individuals showed significant aggregation for most distances greater than 40 cm; from 0 to 40 cm the spatial distribution of stems did not differ (p>0.05) from a random distribution. Aggregation increased from year 1 to year 4 of the study period, which seems to be related to an increase in density.Although we did not have a control site, results for both years with previous burning strongly suggest the effect of fire in the population dynamic.

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来源期刊

Open Ecology Journal Environmental Science-Environmental Science (all)

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期刊介绍： The Open Ecology Journal is an open access online journal which embraces the trans-disciplinary nature of ecology, seeking to publish original research articles, reviews, letters and guest edited single topic issues representing important scientific progress from all areas of ecology and its linkages to other fields. The journal also focuses on the basic principles of the natural environment and its conservation. Contributions may be based on any taxa, natural or artificial environments, biodiversity, spatial scales, temporal scales, and methods that advance this multi-faceted and dynamic science. The Open Ecology Journal also considers empirical and theoretical studies that promote the construction of a broadly applicable conceptual framework or that present rigorous tests or novel applications of ecological theory.