Enhanced light interception and light use efficiency explain overyielding in young tree communities,Ecology Letters

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Enhanced light interception and light use efficiency explain overyielding in young tree communities
Ecology Letters ( IF 7.6 ) Pub Date : 2021-03-03 , DOI: 10.1111/ele.13717
Laura J. Williams _{1,

2} , Ethan E. Butler ₁ , Jeannine Cavender‐Bares ₂ , Artur Stefanski ₁ , Karen E. Rice _{1,

3} , Christian Messier _{4,

5} , Alain Paquette ₄ , Peter B. Reich _{1,

6}

Affiliation

Diverse plant communities are often more productive than mono‐specific ones. Several possible mechanisms underlie this phenomenon but their relative importance remains unknown. Here we investigated whether light interception alone or in combination with light use efficiency (LUE) of dominant and subordinate species explained greater productivity of mixtures relative to monocultures (i.e. overyielding) in 108 young experimental tree communities. We found mixed‐species communities that intercepted more light than their corresponding monocultures had 84% probability of overyielding. Enhanced LUE, which arose via several pathways, also mattered: the probability of overyielding was 71% when, in a mixture, species with higher ‘inherent’ LUE (i.e. LUE in monoculture) intercepted more light than species with lower LUE; 94% when dominant species increased their LUE in mixture; and 79% when subordinate species increased their LUE. Our results suggest that greater light interception and greater LUE, generated by inter and intraspecific variation, together drive overyielding in mixed‐species forests.

中文翻译：

增强的光拦截和光利用效率解释了在幼树群落中的过高产量

多样化的植物群落通常比单一植物群落更有生产力。有几种可能的机制是这种现象的基础，但它们的相对重要性仍然未知。在这里，我们调查了在108个年轻的实验树群落中，单独的光拦截还是与优势种和从属种的光利用效率（LUE）相结合，可以解释混合物相对于单一栽培（即高产）的更高生产率。我们发现，混合物种群落的采光量超过了其相应的单一栽培种的采收率，有超过84％的可能性。通过多种途径产生的增强的LUE也很重要：当混合时，具有较高“固有” LUE的物种（即单一栽培中的LUE）比具有较低LUE的物种截获更多的光时，过度生产的概率为71％；94％的优势种增加了混合物中的LUE值；下属物种增加其LUE时占79％。我们的结果表明，种间和种内变异产生的更大的光拦截和更大的LUE共同推动了混合物种森林的高产。

更新日期：2021-04-14

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