Development and stabilisation of soil structure via interactions between organic matter, arbuscular mycorrhizal fungi and plant roots
Development and stabilisation of soil structure via interactions between organic matter, arbuscular mycorrhizal fungi and plant roots
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DOI：
10.1016/j.soilbio.2012.09.020
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发表时间：
2013-02-01
影响因子：
9.7
通讯作者：
McGee, Peter A.
中科院分区：
文献类型：
--
作者：
Daynes, Cathal N.;Field, Damien J.;McGee, Peter A.
更清楚地了解土壤结构发展和稳定的机制，将使退化土壤的恢复更可预测。土壤团聚体（HM）的层次模型假设，预测土壤是自组织系统，介导的矿物成分，有机质和生物活性，这有助于创建和稳定土壤结构之间的相互作用和反馈。为了确定这些后者的成分，有机物（堆肥），活植物根（三个多年生物种：两个木本，一个草）和一个社区的丛枝菌根（AM）真菌的组合的贡献，添加到一个大规模的矿山废弃物在一个控制的盆栽实验。据推测，缺乏这三种成分中的任何一种都会阻碍稳定土壤结构的形成，通过6个月培养期后孔隙度的形成、容重的变化、土壤保水特性和水稳定性团聚体进行评估。测定了土壤有机碳、氮、阳离子交换量和pH值的含量和浓度。有机质、活植物根系和AM真菌这三个因素都是稳定土壤结构发展所必需的，但方式复杂。总体而言，数据表明，在存在足够的有机质的情况下，植物根系是土壤结构发展的关键因素，土壤结构通过AM真菌进一步稳定。(C)2012爱思唯尔有限公司保留所有权利。
A clearer understanding of the mechanisms that underpin the development and stabilisation of soil structure would enable a more predictable restoration of degraded soil. A hierarchical model of soil aggregation (HM) is posited that predicts soils to be self-organising systems, mediated via interactions and feedbacks between their mineral constituents, organic matter and biotic activity, which serve to create and stabilise soil structure. To determine the contribution of these latter constituents, combinations of organic matter (compost), living plant roots (three perennial species: two woody, one grass) and a community of arbuscular mycorrhizal (AM) fungi where added to a massive mine spoil in a controlled pot experiment. It was hypothesized that the absence of any of these three components would retard the development of stable soil structure, as assessed through the development of porosity, changes in bulk density, soil water retention characteristics and water-stable aggregation following a 6 month incubation period. The concentration and content of soil organic carbon (SOC), nitrogen, cation exchange capacity and pH were also determined. All three factors, organic matter, living plant roots and AM fungi were required for the development of stable soil structure, but in complex ways. Overall, the data indicate that in the presence of adequate organic matter, plant roots are key contributors to the development of soil structure which is further stabilized by AM fungi. (C) 2012 Elsevier Ltd. All rights reserved.