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首页> 外文期刊>Oecologia >Effects of long- and short-term management on the functional structure of meadows through species turnover and intraspecific trait variability
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Effects of long- and short-term management on the functional structure of meadows through species turnover and intraspecific trait variability

机译：长期和短期管理通过物种更新和种内性状变异对草地功能结构的影响

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The functional structures of communities respond to environmental changes by both species replacement (turnover) and within-species variation (intraspecific trait variability; ITV). Evidence is lacking on the relative importance of these two components, particularly in response to both short- and long-term environmental disturbance. We hypothesized that such short- and long-term perturbations would induce changes in community functional structure primarily via ITV and turnover, respectively. To test this we applied an experimental design across long-term mown and abandoned meadows, with each plot containing a further level of short-term management treatments: mowing, grazing and abandonment. Within each plot, species composition and trait values [height, shoot biomass, and specific leaf area (SLA)] were recorded on up to five individuals per species. Positive covariations between the contribution of species turnover and ITV occurred for height and shoot biomass in response to both short- and long-term management, indicating that species turnover and intraspecific adjustments selected for similar trait values. Positive covariations also occurred for SLA, but only in response to long-term management. The contributions of turnover and ITV changed depending on both the trait and management trajectory. As expected, communities responded to short-term disturbances mostly through changes in intraspecific trait variability, particularly for height and biomass. Interestingly, for SLA they responded to long-term disturbances by both species turnover and intraspecific adjustments. These findings highlight the importance of both ITV and species turnover in adjusting grassland functional trait response to environmental perturbation, and show that the response is trait specific and affected by disturbance regime history.
机译：社区的功能结构通过物种置换（周转）和物种内变异（种内性状变异; ITV）对环境变化做出响应。缺乏关于这两个组成部分相对重要性的证据，尤其是对于短期和长期环境干扰而言。我们假设这样的短期和长期扰动将分别通过ITV和营业额分别引起社区功能结构的变化。为了测试这一点，我们在长期的割草场和废弃草地上进行了实验设计，每块地块都包含进一步的短期管理措施：割草，放牧和废弃。在每个样地中，每个物种最多记录五个个体的物种组成和特征值[高度，枝条生物量和比叶面积（SLA）]。响应短期和长期管理，高度和枝条生物量的物种转换和ITV的贡献之间发生正协变，表明物种转换和种内调整选择为相似的性状值。 SLA也发生了正协变，但仅是针对长期管理。营业额和ITV的贡献根据特征和管理轨迹而变化。正如预期的那样，社区对短期干扰的响应主要是通过种内性状变异性的变化来实现的，特别是对于身高和生物量。有趣的是，对于SLA，他们通过物种更新和种内调整来应对长期干扰。这些发现突出了ITV和物种更新在调整草地功能性状对环境扰动的响应中的重要性，并表明该响应是特定于性状的，并受干扰制度历史的影响。

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