Evaluating the distribution of plant life‐history traits in relation to current and historical landscape configurations
Evaluating the distribution of plant life‐history traits in relation to current and historical landscape configurations
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评估与当前和历史景观配置相关的植物生活史性状的分布
DOI：
10.1111/j.1365-2745.2007.01232.x
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发表时间：
2007
影响因子：
5.5
通讯作者：
R. Lindborg
中科院分区：
文献类型：
--
作者：
R. Lindborg
1 在北欧乡村景观中，小农场的废弃和农业集约化导致半天然草地减少，并导致生物多样性丧失。尽管对乡村景观中土地利用变化的物种丰富度响应进行了相对充分的研究，但很少有人研究其随着时间的推移对植物物种组成的影响。 2 在本研究中，分析了与时空传播相关的四种生活史特征：种子大小、种子传播属性（例如芒、翅膀）、种子库持久性和植物寿命（一年生植物、具有和不具有克隆能力的多年生植物）。我研究了半天然草原植物中这些性状分布的差异如何与当前和历史的景观配置相关。 3 四个调查性状中的两个（寿命和种子库持久性）的分布与草地连通性和面积相关，而种子大小和种子传播属性则不然。短寿命植物的比例与当前草地连通性和草地面积正相关，而长寿植物，无论是否具有克隆能力，与当前草地连通性和面积无关。 4 相比之下，寿命短的植物不受历史草地连通性的影响，但寿命长的克隆植物的比例与历史草地连通性高和草地面积大呈负相关。此外，种子库中长期存在的物种比例与历史草地连通性呈负相关。 5 结果表明，应对景观破碎化有两种主要策略：要么在种子库中持续存在，要么无性地分散。短寿命植物和不具有克隆能力的植物对分离的敏感性较高，这引起了人们对考虑生活史特征以充分了解植物群落动态随时间的重要性的关注。从长远来看，历史连通性和草原面积的减少将创建一个以克隆长寿植物和具有持久种子库的植物为主的草原群落。 6 这项研究表明，景观配置的空间和时间效应是构建草原当地植物物种组成的重要因素。研究结果为我们理解大规模生态过程带来了重要见解，也与全球碎片化农业景观的生物多样性保护高度相关。
1 In north European rural landscapes, abandonment of small farms and agricultural intensification have led to a decline in semi‐natural grassland, with associated biodiversity loss. Although species richness response to land‐use change in rural landscapes is relatively well studied, few have examined its effects on plant species composition over time. 2 In this study, four life‐history traits associated with spatiotemporal dispersal were analysed: seed size, seed dispersal attributes (e.g. awns, wings), seed bank persistence and plant longevity (annuals, perennial with and without clonal ability). I investigated how differences in distribution of these traits among plants in semi‐natural grasslands are related to current and historical landscape configuration. 3 The distributions of two out of the four investigated traits, longevity and seed bank persistence, were correlated with grassland connectivity and area, whereas seed size and seed dispersal attributes were not. The proportion of short‐lived plants was positively associated with current grassland connectivity and grassland area, whereas long‐lived species, with and without clonal ability, were unrelated to current grassland connectivity and area. 4 In contrast, short‐lived plants were not affected by historical grassland connectivity, but the proportion of long‐lived clonal plants was negatively associated with high historical grassland connectivity and large grassland area. In addition, the proportion of species with long persistence in the seed bank was negatively associated with historical grassland connectivity. 5 The result suggests that there are two main strategies to persist in response to landscape fragmentation: either persist in the seed bank or disperse vegetatively. The higher sensitivity to isolation among short‐lived plants and plants without clonal ability calls attention to the importance of considering life‐history traits to understand plant community dynamics fully over time. In the long term, reduction in historical connectivity and grassland area will thus create a grassland community dominated by clonal long‐lived plants and plants with a persistent seed bank. 6 This study shows that both spatial and temporal effects of landscape configuration are important factors structuring local plant species composition in grasslands. The results bring important insights to our understanding of large‐scale ecological processes, and are also highly relevant to biodiversity conservation in fragmented agricultural landscapes worldwide.