Soil biota effects on soil structure: Interactions between arbuscular mycorrhizal fungal mycelium and collembola
Soil biota effects on soil structure: Interactions between arbuscular mycorrhizal fungal mycelium and collembola
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DOI：
10.1016/j.soilbio.2012.03.001
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发表时间：
2012-07
影响因子：
9.7
通讯作者：
Md. Rezaul Karim Siddiky;J. Kohler;Marco Cosme;M. Rillig
中科院分区：
文献类型：
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作者：
Md. Rezaul Karim Siddiky;J. Kohler;Marco Cosme;M. Rillig
土壤团聚是由土壤生物介导的重要生态系统过程。弹尾目和丛枝菌根真菌是土壤中代表不同功能群的主要生物群，被认为是土壤团聚的两个关键促进者。虽然有几项研究已经通过实验证明，AM真菌，最近，弹尾目影响土壤结构，有没有研究调查这两种土壤生物如何影响土壤团聚不包括植物根系的影响，土壤团聚的另一个重要驱动因素。考虑到AM真菌和弹尾虫在陆地生态系统中的重要性，在这里，我们问这两种生物是否有任何影响土壤团聚时，根不存在。为了检验这个问题，我们进行了一个完全析因的温室研究，操纵弹尾虫和AM真菌的存在，并使用38 μm的尼龙筛网隔室排除了车前草的根。我们量化的水稳定的土壤团聚体在菌丝室的四个大小类，并监测了一些其他的解释变量，包括AM（和非AM）真菌土壤菌丝长度的土壤团聚体。当存在弹尾虫时，菌丝室中的土壤表现出更大的土壤聚集性，具有更大的平均重量直径，并且在AM真菌的存在下发现了类似的结果，与对照处理相比。此外，AM真菌和弹尾虫的共同存在导致土壤团聚体的非加性增加。我们的研究清楚地表明，弹尾虫可以增强土壤团聚，他们可以部分补充AM真菌的影响，这些影响是独立的根。
Soil aggregation is an important ecosystem process mediated by soil organisms. Collembola and arbuscular mycorrhizal (AM) fungi are major soil biota representing different functional groups, and are known as two key promoters of soil aggregation. Although several studies have experimentally demonstrated that AM fungi and, more recently, collembola affect soil structure, there is no study investigating how both soil organisms affect soil aggregation excluding the influence of plant roots, another important driver of soil aggregation. Considering the importance of AM fungi and collembola in terrestrial ecosystems, here we asked if both organisms have any influence on soil aggregation when roots are not present. In order to examine this question we conducted a completely factorial greenhouse study manipulating the presence of both collembola and AM fungi and excluded the roots of Plantago lanceolata using a 38 μm nylon screen compartment. We quantified soil aggregation as water stable soil aggregates in four size classes in the hyphal compartment and monitored a number of other explanatory variables, including AM (and non-AM) fungal soil hyphal length. The soil in the hyphal compartment showed greater soil aggregation with larger mean weight diameter when collembola were present, and a similar result was found in the presence of AM fungi, compared to control treatments. Moreover, combined presence of both AM fungi and collembola resulted in a non-additive increase of soil aggregation. Our study clearly indicated that collembola can enhance soil aggregation, that they can partially complement effects of AM fungi, and that these effects are independent of roots.