Arbuscular mycorrhizal fungi and collembola non-additively increase soil aggregation
Arbuscular mycorrhizal fungi and collembola non-additively increase soil aggregation
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DOI：
10.1016/j.soilbio.2011.12.022
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发表时间：
2012-04
影响因子：
9.7
通讯作者：
Md. Rezaul Karim Siddiky;J. Schaller;T. Caruso;M. Rillig
中科院分区：
文献类型：
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作者：
Md. Rezaul Karim Siddiky;J. Schaller;T. Caruso;M. Rillig
土壤团聚体是由土壤生物群调节的主要生态系统过程。弹尾目和丛枝菌根真菌是土壤中重要的类群，可以通过多种方式相互作用。很少有研究研究弹尾虫对土壤聚集性的影响，而许多研究已经量化了AM的影响。在这里，我们询问弹尾虫是否对土壤聚集性有影响，以及它们是否改变了AM真菌对土壤聚集性的调节作用。我们进行了一项因子温室研究，利用两种不同的植物，高粱和胡萝卜，控制弹尾目和AM真菌的存在。我们测量了四个大小类别的根长和生物量、AMF(和非AMF)土壤菌丝长度、根定植和弹尾虫种群，以及量化的水分和稳定土壤团聚体(WSA)。单独接种AMF菌丝和弹尾菌的土壤WSA高于对照。此外，AMF和弹尾目之间的交互作用显著，与单一处理相比，联合应用的非添加剂增加。我们的研究结果表明，弹尾目动物可以通过促进土壤聚集性在维持生态可持续性方面发挥关键作用，并表明考虑生物相互作用对理解土壤结构形成的重要性。
Soil aggregation is a principal ecosystem process mediated by soil biota. Collembola and arbuscular mycorrhizal (AM) fungi are important groups in the soil, and can interact in various ways. Few studies have examined collembola effects on soil aggregation, while many have quantified AM effects. Here, we asked if collembola have any effect on soil aggregation, and if they alter AM fungi-mediated effects on soil aggregation. We carried out a factorial greenhouse study, manipulating the presence of both collembola and AM fungi, using two different plant species, Sorghum vulgare and Daucus carota. We measured root length and biomass, AMF (and non-AMF) soil hyphal length, root colonization, and collembolan populations, and quantified water stable soil aggregates (WSA) in four size classes. Soil exposed to growth of AMF hyphae and collembola individually had higher WSA than control treatments. Moreover, the interaction effects between AMF and collembola were significant, with non-additive increases in the combined application compared to the single treatments. Our findings show that collembola can play a crucial role in maintaining ecological sustainability through promoting soil aggregation, and point to the importance of considering organism interactions in understanding formation of soil structure.