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Biodiversity–productivity relationships in a natural grassland community vary under diversity loss scenarios
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-10-22 , DOI: 10.1111/1365-2745.13797 Qingmin Pan 1, 2 , Amy J. Symstad 3 , Yongfei Bai 1 , Jianhui Huang 1 , Jianguo Wu 4 , Shahid Naeem 5 , Dima Chen 6 , Dashuan Tian 7 , Qibing Wang 1 , Xingguo Han 1
中文翻译：
自然草原群落中的生物多样性-生产力关系在多样性丧失情景下有所不同
更新日期：2021-11-12
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-10-22 , DOI: 10.1111/1365-2745.13797 Qingmin Pan 1, 2 , Amy J. Symstad 3 , Yongfei Bai 1 , Jianhui Huang 1 , Jianguo Wu 4 , Shahid Naeem 5 , Dima Chen 6 , Dashuan Tian 7 , Qibing Wang 1 , Xingguo Han 1
Affiliation
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- Understanding the biodiversity–productivity relationship and underlying mechanisms in natural ecosystems under realistic diversity loss scenarios remains a major challenge for ecologists despite its importance for predicting impacts of rapid loss of biodiversity worldwide. Here we report the results of a plant functional group (PFG) removal experiment conducted on the Mongolian Plateau, the largest remaining natural grassland in the world.
- Our results demonstrated that the biodiversity–productivity relationship varied among positive linear, neutral and unimodal forms under different PFG loss patterns. Moreover, the form of this relationship with the same PFG loss pattern sometimes changed through time.
- The abundance of the remaining PFG(s) before removal and their compensation following the loss of other PFGs were two major mechanisms affecting the biodiversity–productivity relationship under diversity loss scenarios. The abundance effect promoted positive responses of productivity to biodiversity, but the compensation effect caused several biodiversity–productivity relationships, hinging on its direction (positive or negative) and strength. As indicated by the values of the compensation index, negative, zero and partial compensations contributed to the positive relationships, while full compensation resulted in a neutral relationship. Overcompensation at intermediate PFG richness levels created a unimodal curve in our system, but it could also lead to a negative linear relationship.
- Synthesis. Our experiment provides a vivid picture of how the form of the biodiversity–productivity relationship varies among different diversity loss patterns in a natural ecosystem. We argue that compensation by the remaining species, which is not revealed by synthesized biodiversity experiments, plays a critical role in shaping the form of this relationship when diversity is lost from existing systems. The direction and strength of compensation are highly dependent on extirpation scenarios. Thus, impacts of biodiversity loss on natural ecosystems are likely more complex than predicted by the canonical positive saturating curve obtained from the synthesized biodiversity experiments. We suggest that models forecasting the consequences of biodiversity declines on natural ecosystems should take into account diversity loss patterns and the ensuing compensation.
中文翻译：
自然草原群落中的生物多样性-生产力关系在多样性丧失情景下有所不同
- 尽管在预测全球生物多样性快速丧失的影响方面具有重要意义，但在现实的多样性丧失情景下了解自然生态系统中的生物多样性-生产力关系和潜在机制仍然是生态学家面临的主要挑战。在这里，我们报告了在蒙古高原进行的植物功能群 (PFG) 去除实验的结果，蒙古高原是世界上最大的剩余天然草原。
- 我们的结果表明，在不同的 PFG 损失模式下，生物多样性 - 生产力关系在正线性、中性和单峰形式之间有所不同。此外，这种具有相同 PFG 损失模式的关系的形式有时会随着时间而改变。
- 移除前剩余 PFG 的丰度及其在其他 PFG 丧失后的补偿是影响多样性丧失情景下生物多样性 - 生产力关系的两个主要机制。丰度效应促进了生产力对生物多样性的积极响应，但补偿效应导致了几种生物多样性-生产力关系，取决于其方向（积极或消极）和强度。正如补偿指数的值所表明的，负补偿、零补偿和部分补偿对正相关有贡献，而完全补偿则产生中性关系。中间 PFG 丰富度水平的过度补偿在我们的系统中创建了单峰曲线，但它也可能导致负线性关系。
- 合成. 我们的实验生动地展示了生物多样性-生产力关系的形式如何在自然生态系统中不同的多样性丧失模式之间变化。我们认为，当现有系统失去多样性时，剩余物种的补偿在形成这种关系的形式方面起着关键作用，这在合成生物多样性实验中没有体现出来。补偿的方向和强度高度依赖于灭绝场景。因此，生物多样性丧失对自然生态系统的影响可能比综合生物多样性实验获得的典型正饱和曲线所预测的更复杂。
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