Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests

Guille Peguero, J. Sardans, D. Asensio, M. Fernández‐Martínez, A. Gargallo‐Garriga, O. Grau, J. Llusià, O. Margalef, Laura Márquez, R. Ogaya, Ifigenia Urbina, Elodie A. Courtois, C. Stahl, Leandro Van Langenhove, L. Verryckt, Andreas Richter, I. Janssens, J. Peñuelas
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引用次数: 15

Abstract

Soil fauna is a key control of the decomposition rate of leaf litter, yet its interactions with litter quality and the soil environment remain elusive. We conducted a litter decomposition experiment across different topographic levels within the landscape replicated in two rainforest sites providing natural gradients in soil fertility to test the hypothesis that low nutrient availability in litter and soil increases the strength of fauna control over litter decomposition. We crossed these data with a large dataset of 44 variables characterizing the biotic and abiotic microenvironment of each sampling point and found that microbe-driven carbon (C) and nitrogen (N) losses from leaf litter were 10.1 and 17.9% lower, respectively, in the nutrient-poorest site, but this among-site difference was equalized when meso- and macrofauna had access to the litterbags. Further, on average, soil fauna enhanced the rate of litter decomposition by 22.6%, and this contribution consistently increased as nutrient availability in the microenvironment declined. Our results indicate that nutrient scarcity increases the importance of soil fauna on C and N cycling in tropical rainforests. Further, soil fauna is able to equalize differences in microbial decomposition potential, thus buffering to a remarkable extent nutrient shortages at an ecosystem level.
营养缺乏加强了热带雨林土壤动物对凋落叶分解的控制
土壤动物是控制凋落叶分解速率的关键因素,但其与凋落叶质量和土壤环境的相互作用尚不明确。我们在两个热带雨林站点复制了不同地形水平的凋落物分解实验,提供了土壤肥力的自然梯度,以验证凋落物和土壤的低养分有效性增加了动物控制凋落物分解的强度的假设。我们将这些数据与每个采样点的生物和非生物微环境的44个变量的大数据集进行交叉分析,发现微生物驱动的凋落叶碳(C)和氮(N)损失在营养最贫乏的地点分别低10.1和17.9%,但当中、大型动物有机会进入凋落叶袋时,这种差异在地点之间是相等的。土壤动物对凋落物分解的平均贡献率为22.6%,且随着微环境中养分有效性的下降,土壤动物对凋落物分解的贡献率持续增加。研究结果表明,土壤动物对热带雨林碳氮循环的重要性随着养分的缺乏而增加。此外,土壤动物能够平衡微生物分解潜力的差异,从而在生态系统水平上显著缓冲养分短缺。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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