Factors driving plant rarity in dry grasslands on different spatial scales: a functional trait approach

Factors driving plant rarity in dry grasslands on different spatial scales: a functional trait approach
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不同空间尺度上干旱草原植物稀有的驱动因素:功能性状方法

DOI:
10.1007/s10531-013-0455-y
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发表时间:
2013
影响因子:
3.4
通讯作者:
Ristow
Ristow
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Lauterbach;Römermann;Jeltsch;Ristow

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在欧洲干旱草原土地利用的变化影响植物物种的性能和频率。潜在的驱动力是富营养化和生境破碎化。这些因素的重要性大概是规模依赖。我们使用了功能性状的方法来检测的过程中,影响物种的频率和濒危在不同的空间尺度。我们测试了功能性状与(1)频率和(2)在地方,区域和国家尺度上的濒危程度之间的关联。我们集中在五个选定的性状,描述了植物物种的生活史,并与竞争,扩散能力和栖息地特异性。在德国东北部的59个干草地上,对28种多年生植物的株高、比叶面积、植物覆盖度、开花高峰期和繁殖体质量进行了测定。多元回归模型表明,在多个空间尺度上,物种频率与植物高度、植物覆盖度和比叶面积呈正相关,物种濒危程度与植物高度、植物覆盖度和比叶面积呈负相关。在局部尺度上,一水硬铝石的质量对物种频率有负面影响。在全国和区域范围内,更常见和濒危程度较低的物种的开花高峰期较晚。我们得出的结论是,竞争性状更重要的是在较大的尺度上,而扩散性状是更重要的物种频率在较小的尺度上。在国家和区域尺度上,富营养化和栖息地丧失可能是物种威胁的主要驱动因素,而在地方尺度上,破碎化对干旱草原物种的表现起着至关重要的作用。
In European dry grasslands land-use changes affect plant species performance and frequency. Potential driving forces are eutrophication and habitat fragmentation. The importance of these factors is presumably scale dependent. We used a functional trait approach to detect processes that influence species frequency and endangerment on different spatial scales. We tested for associations between functional traits and (1) frequency and (2) degree of endangerment on local, regional and national scales. We focussed on five selected traits that describe the life-history of plant species and that are related to competition, dispersal ability and habitat specificity. Trait data on plant height, SLA, plant coverage, peak of flowering and diaspore mass were measured for 28 perennials from common to rare and endangered to non-endangered on 59 dry grassland sites in north-eastern Germany. Multiple regression models revealed that species frequency is positively and species endangerment negatively related to plant height, plant coverage and SLA on more than one spatial scale. On the local scale, diaspore mass has a negative effect on species frequency. More frequent and less endangered species show a later peak of flowering on nationwide and regional scales. We concluded that competition traits are more important on larger scales, whereas dispersal traits are more important for species frequency on the smaller scale. On national and regional scales, eutrophication and habitat loss may be the main drivers of species threat, whereas on the local scale fragmentation plays a crucial role for the performance of dry grassland species.
DOI: --
发表时间: 2003
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DOI: 10.1111/j.1461-0248.2008.01261.x
发表时间: 2009-01-01
期刊: ECOLOGY LETTERS
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