功能性状在种群内的变异大于种群间的变异——四种钙质干草地植物的研究

IF 1.1 4区 生物学 Q3 PLANT SCIENCES
Tuexenia Pub Date : 2016-01-01 DOI:10.14471/2016.36.018
Mélanie Harzé, G. Mahy, A. Monty
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引用次数: 21

摘要

大多数植物功能性状的研究都使用物种平均性状值,并假设平均值足以代表所考虑的每个物种。虽然该方法在群落生态学研究中已被证明是有价值的,但植物的功能性状在不同尺度上(即群体间和群体内)存在显著差异。物种功能性状变异的研究有助于群落生态学研究的日益精确。然而,目前在文献中,植物性状变异的范围还没有得到很好的解决。钙质草地是一种适合研究小空间尺度植物性状变异的生态系统。许多物种存在于非均质钙质地点,由于土壤深度、土壤湿度、坡向和坡度的变化,它们的水分状态有显著差异。本研究评估了种群内功能性状变异的程度,并验证了这种变异可以用种群内环境异质性来解释的假设。对4个钙质草地物种3个种群共950个个体的3个功能性状(sla特异叶面积、ldmc叶片干物质含量和植物营养高度)进行了评价。土壤深度和潜在直接入射辐射的异质性也被量化,并与植物功能性状变异有关。将种群内功能性状变异与收集数据的种群间变异和全球TRY功能性状数据库的种群间变异数据进行比较。结果表明:SLA、LDMC和株高具有较大的群体内变异(SLA为72 ~ 95%,LDMC为78 ~ 100%,营养高度为70 ~ 94%)。结果还表明,位于土壤较深或潜在直接入射辐射较低、缓坡或朝北斜坡上的个体株高和SLA较高。我们的研究结果还支持了较高的植物高度、较高的SLA和较低的LDMC与较高的土壤水分有效性相关的概念。生活在浅层土壤或更暴露地区的个体更有能力应对环境压力。我们的研究结果表明,个体对环境异质性具有可塑性或局部适应性。该研究表明,由于个体的响应程度很大程度上取决于个体的位置和微环境条件,因此涉及植物功能性状的详细分析需要大量个体的原位测量。忽略种群内的性状变异可能是至关重要的,因为种内变异在种群尺度上可能非常高,并且可能是由局部环境异质性驱动的。2015年11月26日收稿,2016年4月29日收稿
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Functional traits are more variable at the intra- than inter-population level: a study of four calcareous dry-grassland plant species
The majority of studies investigating plant functional traits have used species average trait values, and assumed that average values were sufficiently representative of each species considered. Although this approach has proven valuable in community ecology studies, plant functional traits can significantly vary at different scales, i.e. between but also within populations. The study of species functional trait variability can facilitate increasingly accurate studies in community ecology. Nevertheless, the current extent of within-site plant trait variability has been poorly addressed in the literature. Calcareous grasslands are ecosystems well-suited to study plant trait variation at small spatial scales. Many species are present on heterogeneous calcareous sites, with significant differences in hydric status due to variations in soil depth, soil moisture, aspect, and slope. This study assesses the extent of intra-population functional trait variability and tests the hypothesis that this variability can be explained by within-site environmental heterogeneity. Three functional traits (SLA-specific leaf area, LDMC-leaf dry matter content, and plant vegetative height) were assessed in three populations of four calcareous grassland species totalling 950 individuals. The heterogeneity in soil depth and potential direct incident radiation was also quantified and related to plant functional trait variability. The intra-population functional trait variability was compared to the inter-population variability of collected data and global inter-population variability data obtained from the worldwide TRY functional traits database. The results showed that SLA, LDMC, and plant height are characterized by considerable intra-population variation (SLA: 72–95%, LDMC: 78–100% and vegetative height: 70–94% of trait variability). The results also indicate higher plant height and larger SLA for individuals located in plots with deeper soils or lower potential direct incident radiation, on gentle slopes or north-facing slopes. Our findings additionally support the concept that higher plant height, higher SLA, and lower LDMC are related to higher availability of soil water. Individuals on shallow soils or in more exposed areas are better equipped to cope with environmental stress. Our results indicate plasticity or local adaptation in individuals to environmental heterogeneity. This study suggests that detailed analyses involving plant functional traits require measurements in situ from a large number of individuals, as the degree of individual response strongly depends on an individual’s location and its micro-environmental conditions. Neglecting intra-population trait variability may be critical, as intraspecific variation can be very high at the population scale, and is likely to be driven by local environmental heterogeneity. Manuscript received 26 November 2015, accepted 29 April 2016 Co-ordinating Editor: Thomas Becker 322
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来源期刊
Tuexenia
Tuexenia PLANT SCIENCES-
CiteScore
2.80
自引率
25.00%
发文量
0
期刊介绍: Tuexenia publiziert Original- und Übersichtsarbeiten sowie Berichte zu Themen der Geobotanik / Vegetationsökologie und zu Nachbarwissenschaften wie Populationsökologie, Biodiversitätsforschung, Biozönologie, Renaturierungsökologie und ihren Anwendungen, vor allem im Naturschutz. Der geografische Schwerpunkt liegt in Zentraleuropa und angrenzenden Regionen.Tuexenia erscheint jährlich in einem Band, der etwa zur Jahresmitte fertig gestellt wird. Autoren erhalten von jeder Arbeit eine PDF-Datei und gemeinsam 20 Sonderdrucke kostenlos. Die Qualität der wissenschaftlichen Manuskripte wird durch die Redaktion und einen Wissenschaftlichen Beirat (Peer Review) gesichert (s. auch die Manuskript-Richtlinien vor dieser Seite). Es werden keine Druckkosten erhoben. Tuexenia legt Wert auf allgemeine Online-Verfügbarkeit der Beiträge.
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