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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Links Between Plant Litter Chemistry, Species Diversity, And Below-ground Ecosystem Function
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Links Between Plant Litter Chemistry, Species Diversity, And Below-ground Ecosystem Function

机译：植物凋落物化学，物种多样性与地下生态系统功能之间的联系

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摘要

Decomposition is a critical source of plant nutrients, and drives the largest flux of terrestrial C to the atmosphere. Decomposing soil organic matter typically contains litter from multiple plant species, yet we lack a mechanistic understanding of how species diversity influences decomposition processes. Here, we show that soil C and N cycling during decomposition are controlled by the composition and diversity of chemical compounds within plant litter mixtures, rather than by simple metrics of plant species diversity. We amended native soils with litter mixtures containing up to 4 alpine plant species, and we used 9 litter chemical traits to evaluate the chemical composition (i.e., the identity and quantity of compounds) and chemical diversity of the litter mixtures. The chemical composition of the litter mixtures was the strongest predictor of soil respiration, net N mineralization, and microbial biomass N. Soil respiration and net N mineralization rates were also significantly correlated with the chemical diversity of the litter mixtures. In contrast, soil C and N cycling rates were poorly correlated with plant species richness, and there was no relationship between species richness and the chemical diversity of the litter mixtures. These results indicate that the composition and diversity of chemical compounds in litter are potentially important functional traits affecting decomposition, and simple metrics like plant species richness may fail to capture variation in these traits. Litter chemical traits therefore provide a mechanistic link between organisms, species diversity, and key components of below-ground ecosystem function.
机译：分解是植物养分的重要来源，并且将最大量的陆地C排放到大气中。分解土壤有机物通常包含来自多种植物物种的凋落物，但是我们对物种多样性如何影响分解过程缺乏机械理解。在这里，我们表明分解过程中的土壤碳和氮循环受植物凋落物混合物中化合物的组成和多样性控制，而不是受植物物种多样性的简单度量控制。我们用含有多达4种高山​​植物物种的凋落物混合物对原生土壤进行了改良，并使用9种凋落物的化学性状来评估凋落物混合物的化学组成（即化合物的身份和数量）和化学多样性。垃圾混合物的化学组成是土壤呼吸，净氮矿化和微生物生物量氮的最强预测因子。土壤呼吸和净氮矿化率也与垃圾混合物的化学多样性显着相关。相反，土壤碳和氮的循环速率与植物物种丰富度的相关性很弱，物种丰富度与凋落物混合物的化学多样性之间没有关系。这些结果表明，凋落物中化合物的组成和多样性是影响分解的潜在重要功能性状，而简单的度量标准（如植物物种丰富度）可能无法捕获这些性状的变异。因此，凋落物的化学特性提供了生物，物种多样性和地下生态系统功能的关键组成部分之间的机械联系。

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