Species diversity and functional diversity relationship varies with disturbance intensity
Species diversity and functional diversity relationship varies with disturbance intensity
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DOI：
10.1890/es10-00206.1
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发表时间：
2011-04-01
期刊：
影响因子：
2.7
通讯作者：
Mallik, Azim U.
中科院分区：
文献类型：
--
作者：
Biswas, Shekhar R.;Mallik, Azim U.
物种多样性与功能多样性之间的关系是保护生态学的一个基本课题，但在自然异质系统中直接评价物种多样性及其与干扰强度的关系还很有限。我们研究了基于分类学的物种多样性（在丰富度和均匀度方面）和基于特征的功能多样性河岸和高地植被之间的关系，并确定这种关系的斜率随干扰强度而变化。我们使用的数据从河岸和高地植物群落受到三个类别的干扰强度（低=未砍伐的成熟森林，中间=河岸缓冲区周围的皆伐和河岸缓冲区周围的皆伐+土壤松土，和高=皆伐和皆伐+土壤松土）沿着24个小溪流的北方森林西北部安大略，加拿大。对于所有的干扰强度和生境类型（河岸与高地），物种多样性和功能多样性之间的关系是积极的和非零的，但这些关系的斜率变化显着干扰强度。在物种丰富度与功能丰富度关系中，在低干扰和高干扰下斜率较陡，在中等干扰下斜率相对较小;但是，在物种均匀度与功能均匀度关系中，模式不太清楚。每性状的物种丰富度的差异分布，部分，与这种变化的斜率。在丰富度（相反的均匀度），不太陡峭的斜坡与相对均匀的分布相比，在陡峭的斜坡，竞争（低干扰）和干扰容忍（高干扰）性状占主导地位的非均匀分布的物种丰富度每性状。我们的研究结果证实，物种多样性是一个很好的生态系统稳定性指标，但它取决于生态系统的干扰历史。更重要的是，这项研究表明，物种多样性的不同组成部分（e。例如，在一个实施例中，丰富度和均匀度）和物种丰富度的分布特征一起可以更准确地总结生态系统的稳定性比单独从物种多样性作出的预测。
The relationship between species diversity and functional diversity is a fundamental topic in conservation ecology but its direct evaluation in naturally heterogeneous systems and its relationship with disturbance intensity is limited. We examined the relationship between taxonomy-based species diversity (in terms of richness and evenness) and trait-based functional diversity of riparian and upland vegetation and determined if the slopes of this relationship vary with disturbance intensity. We used data from riparian and upland plant communities subjected to three categorical disturbance intensities (low = uncut mature forests, intermediate = riparian buffers around clearcuts and riparian buffers around clearcuts + soil scarification, and high = clearcuts and clearcuts + soil scarification) along 24 small streams of boreal forests in northwestern Ontario, Canada. For all disturbance intensities and habitat types (riparian vs. upland), the relationships between species diversity and functional diversity were positive and non-zero, but the slopes of these relationships varied significantly with disturbance intensities. In species richness vs. functional richness relationship, the slopes were steep at low and high disturbances and relatively less steep at moderate disturbance; however, patterns were less clear in species evenness vs. functional evenness relationship. Differential distributions of species richness per trait were, in part, associated with this variation in slope. In richness (opposite for evenness), less steep slopes were associated with relatively uniform distribution of species richness per trait compared to non-uniform distribution at steep slopes, where competitive (low disturbance) and disturbance-tolerant (high disturbance) traits dominated. Our results confirm that species diversity is a good indicator of ecosystem stability but it depends on ecosystem disturbance history. More importantly, this study suggests that different components of species diversity (e. g., richness and evenness) and the distribution of species richness per trait together can summarize the stability of an ecosystem more accurately than prediction made from species diversity alone.