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首页> 外文期刊>Journal of Vegetation Science >Comparison of two plant functional approaches to evaluate natural restoration along an old-field - deciduous forest chronosequence.
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Comparison of two plant functional approaches to evaluate natural restoration along an old-field - deciduous forest chronosequence.

机译：两种植物功能性方法的比较，以评估沿老田-落叶林的时间序列的自然恢复。

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Question: Are direct and indirect trait-based approaches similar in their usefulness to synthesize species responses to successional stages? Location: Northern hardwood forests, Quebec, Canada (45 degrees 01'-45 degrees 08'N; 73 degrees 58'-74 degrees 21'W). Methods: Two different trait-based approaches were used to relate plant functional traits to succession on an old-field - deciduous forest chronosequence: (i) a frequently used approach based on co-occurrence of traits (emergent groups), and (ii) a new version of a direct functional approach at the trait level (the fourth-corner method). Additionally, we selected two different cut-off levels for the herb subset of the emergent group classification in order to test its robustness and ecological relevance. Results: Clear patterns of trait associations with stand developmental stages emerged from both the emergent group and the direct approach at the trait level. However, the emergent group classification was found to hide some trait-level differences such as a shift in seed size, light requirement and plant form along the chronosequence. Contrasting results were obtained for the seven or nine group classification of the herbaceous subset, illustrating how critical is the number of groups for emergent group classification. Conclusion: The simultaneous use of two different trait-based approaches provided a robust and comprehensive characterization of vegetation responses in the old-field - deciduous forest chronosequence. It also underlines the different goals as well as the limitations and benefits of these two approaches. Both approaches indicated that abandoned pastures of the northern hardwood biome have good potential for natural recovery. Conversion of these lands to other functions may lead to irremediable loss of biodiversity.
机译：问题：直接和间接基于特征的方法在合成物种对演替阶段的响应方面是否相似？地点：加拿大魁北克北部硬木森林（北纬45度01'-45度;北纬73度58'-74度）。方法：两种不同的基于性状的方法被用于将植物功能性状与旧田-落叶林的时间序列上的演替相关：（i）一种基于性状共现（紧急群体）的常用方法，以及（ii）特征级别的直接功能方法的新版本（第四角方法）。此外，我们为紧急分组分类的草药子集选择了两个不同的临界水平，以测试其稳健性和生态相关性。结果：出现组和直接途径在性状水平上都出现了具有林分发育阶段的性状关联的清晰模式。然而，发现新兴群体分类隐藏了一些性状水平差异，例如种子大小，光照需求和植物形态沿时间序列的变化。获得了七个或九个草类亚组分类的对比结果，说明了紧急组分类的组数目有多关键。结论：同时使用两种不同的基于性状的方法，可以对老田-落叶林的时间序列中的植被响应进行稳健而全面的表征。它还强调了这两种方法的不同目标以及局限性和好处。两种方法都表明，北部硬木生物群落的废弃牧场具有良好的自然恢复潜力。这些土地转为其他功能可能导致生物多样性的不可挽回的损失。

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