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Tree diversity and the temporal stability of mountain forest productivity: testing the effect of species composition, through asynchrony and overyielding
European Journal of Forest Research ( IF 2.8 ) Pub Date : 2020-10-27 , DOI: 10.1007/s10342-020-01329-w
Marion Jourdan , Christian Piedallu , Jonas Baudry , Emmanuel Defossez , Xavier Morin

Climate change modifies ecosystem processes directly through its effect on environmental conditions, but also indirectly by changing community composition. Theoretical studies and grassland experiments suggest that diversity may increase and stabilize communities’ productivity over time. Few recent studies on forest ecosystems suggested the same pattern but with a larger variability between the results. In this paper, we aimed to test stabilizing diversity effect for two kinds of mixtures (Fagus sylvatica–Quercus pubescens and F. sylvatica–Abies alba), and to assess how climate may affect the patterns. We used tree ring data from forest plots triplets distributed along a latitudinal gradient across French Alps, adapting NBE approach to study temporal stability. We found that diversity effect on stability in productivity varies with stand composition. Most beech-fir stands showed a greater stability in productivity over time than monocultures, while beech-oak stands showed a less stable productivity. Considering nonadditive effects, no significant trends were found, regardless of the type of mixed stands considered. We further highlighted that these patterns could be partially explained by asynchrony between species responses (notably to variation in temperature or precipitation), overyielding and climatic conditions. We also showed that the intensity of the diversity effect on stability varies along the ecological gradient, consistently with the stress gradient hypothesis for beech in beech-oak forests, but not for beech-fir forests. This study showed the importance of the species identity on the relationships between diversity, climate and stability of forest productivity. Better depicting diversity and composition effects on forest ecosystem functioning appears to be crucial for forest managers to promote forest adaptation and maintain timber resource in the context of ongoing climate change.

中文翻译:

树木多样性和山地森林生产力的时间稳定性:通过异步和超产测试物种组成的影响

气候变化通过对环境条件的影响直接改变生态系统过程,但也通过改变群落组成间接改变生态系统过程。理论研究和草原实验表明,随着时间的推移,多样性可能会增加和稳定社区的生产力。最近很少有关于森林生态系统的研究表明存在相同的模式,但结果之间的差异更大。在本文中,我们旨在测试两种混合物(山毛榉-Quercus pubescens 和 F. sylvatica-Abies alba)的稳定多样性效应,并评估气候如何影响这些模式。我们使用来自沿着法国阿尔卑斯山的纬度梯度分布的森林地块三元组的树轮数据,采用 NBE 方法来研究时间稳定性。我们发现多样性对生产力稳定性的影响因林分组成而异。随着时间的推移,大多数山毛榉冷杉林的生产力稳定性高于单一栽培,而山毛榉橡树林的生产力稳定性较差。考虑到非加和效应,无论考虑何种混合林分类型,均未发现显着趋势。我们进一步强调,这些模式可以部分解释为物种响应(特别是温度或降水变化)、产量过剩和气候条件之间的不同步。我们还表明,多样性对稳定性的影响强度沿生态梯度变化,与山毛榉-橡树林中山毛榉的应力梯度假设一致,但与山毛榉-冷杉林不同。本研究显示了物种特性对多样性、气候和森林生产力稳定性之间关系的重要性。更好地描述多样性和组成对森林生态系统功能的影响似乎对于森林管理者在持续的气候变化背景下促进森林适应和维护木材资源至关重要。
更新日期:2020-10-27
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