<br>土壤微食物网中的营养相互作用沿着树种丰富度驱动生态系统多功能性,Global Change Biology

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土壤微食物网中的营养相互作用沿着树种丰富度驱动生态系统多功能性
Global Change Biology ( IF 10.8 ) Pub Date : 2024-03-12 , DOI: 10.1111/gcb.17234
Xiuzhen Shi _{1,

2} , Nico Eisenhauer _{3,

4} , Josep Peñuelas _{5,

6} , Yanrong Fu _{1,

2} , Jianqing Wang _{1,

2} , Yuxin Chen ₇ , Shengen Liu ₈ , Lulu He _{1,

2} , Manuel Esteban Lucas-Borja ₉ , Liyan Wang _{1,

2} , Zhiqun Huang _{1,

2}

Affiliation

Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Institute of Geography, Fujian Normal University, Fuzhou, China.
Fujian Provincial Key Laboratory for Subtropical Resources and Environment, School of Geographical Sciences, Fujian Normal University, Fuzhou, China.
German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.
Institute of Biology, Leipzig University, Leipzig, Germany.
CREAF, Centre de Recerca Ecològicai Aplicacions Forestals, Cerdanyola del Vallès, Bellaterra, Catalonia, Spain.
CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, Catalonia, Spain.
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment & Ecology, Xiamen University, Xiamen, China.
College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China.
Higher Technical School of Agricultural and Forestry Engineering, Castilla-La Mancha University, Albacete, Spain.

全球气候变化导致生物多样性迅速丧失，威胁着森林生态系统的功能。然而，我们对跨生物多样性梯度的多种生态系统功能的模式和驱动因素的理解仍然模棱两可。为了解决这一重要的知识差距，我们测量了多个生态系统功能（养分循环、土壤碳储量、有机质分解、植物生产力）对一个、4、8、16 和 32 个物种的树种丰富度梯度的同时响应。年轻的亚热带森林。我们发现树种丰富度对养分循环、有机质分解和植物生产力的影响可以忽略不计，但土壤碳储量和生态系统多功能性随着树种丰富度的增加而显着增加。线性混合效应模型表明，土壤生物，特别是丛枝菌根真菌（AMF）和土壤线虫，对生态系统多功能性产生最大的相对影响。结构方程模型揭示了树种丰富度对土壤微食物网中营养相互作用介导的生态系统多功能性的间接影响。具体来说，我们发现革兰氏阳性菌对土壤线虫丰度有显着的负面影响（自上而下的效应），而AMF生物量对土壤线虫丰度有显着的正面影响（自下而上的效应）。总体而言，我们的研究强调了多营养视角在阐明生物多样性与多功能性关系中的重要性，并强调了保护功能性土壤微食物网以维持多种生态系统功能。

"点击查看英文标题和摘要"

Trophic interactions in soil micro‐food webs drive ecosystem multifunctionality along tree species richness

Rapid biodiversity losses under global climate change threaten forest ecosystem functions. However, our understanding of the patterns and drivers of multiple ecosystem functions across biodiversity gradients remains equivocal. To address this important knowledge gap, we measured simultaneous responses of multiple ecosystem functions (nutrient cycling, soil carbon stocks, organic matter decomposition, plant productivity) to a tree species richness gradient of 1, 4, 8, 16, and 32 species in a young subtropical forest. We found that tree species richness had negligible effects on nutrient cycling, organic matter decomposition, and plant productivity, but soil carbon stocks and ecosystem multifunctionality significantly increased with tree species richness. Linear mixed‐effect models showed that soil organisms, particularly arbuscular mycorrhizal fungi (AMF) and soil nematodes, elicited the greatest relative effects on ecosystem multifunctionality. Structural equation models revealed indirect effects of tree species richness on ecosystem multifunctionality mediated by trophic interactions in soil micro‐food webs. Specifically, we found a significant negative effect of gram‐positive bacteria on soil nematode abundance (a top‐down effect), and a significant positive effect of AMF biomass on soil nematode abundance (a bottom‐up effect). Overall, our study emphasizes the significance of a multitrophic perspective in elucidating biodiversity‐multifunctionality relationships and highlights the conservation of functioning soil micro‐food webs to maintain multiple ecosystem functions.

更新日期：2024-03-12

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