Quantifying the impact of microbes on soil structural development and behaviour in wet soils
Quantifying the impact of microbes on soil structural development and behaviour in wet soils
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DOI：
10.1016/j.soilbio.2014.03.009
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发表时间：
2014-07-01
影响因子：
9.7
通讯作者：
Sturrock, C. J.
中科院分区：
文献类型：
--
作者：
Helliwell, J. R.;Miller, A. J.;Sturrock, C. J.
有证据表明，微生物种群在改变土壤孔隙几何结构方面发挥着重要作用，但对这如何影响随后的土壤行为和功能的充分理解仍然不清楚。特别是，微生物在土壤结构演化中的作用及其对孔隙形态发育的影响是缺乏的。利用生化测量和X射线计算机断层成像(CT)相结合的方法，对不同土壤环境下微尺度土壤结构发育进行了时间比较。其目的是在没有其他可能导致土壤变形的特征(例如蚯蚓、根部等)的情况下，量化微生物活动的影响。关于潮湿土壤中的土壤结构发展，定义为在24周期间土壤孔隙结构的变化，即孔连通性、孔形状和孔体积。检测了三种不同的土壤质地，并比较了田间土壤、灭菌土壤和葡萄糖强化土壤处理之间的变化。我们的结果表明，土壤生物群可以通过改变土壤孔隙几何形状和连通性来显著改变它们的微生境，主要是通过局部的气体释放。这证明了微生物改变土壤结构的能力，并可能有助于揭示微生物丰富的根际可以局部影响水分和养分向植物根部输送的范围。(C)2014爱思唯尔有限公司。保留所有权利。
There is evidence that microbial populations play an important role in altering soil pore geometry, but a full understanding of how this affects subsequent soil behaviour and function is still unclear. In particular the role of microorganisms in soil structural evolution and its consequence for pore morphological development is lacking. Using a combination of bio-chemical measurements and X-ray Computed Tomography (CT) imaging, a temporal comparison of microscale soil structural development in contrasting soil environments was made. The aim was to quantify the effect of microbial activity in the absence of other features likely to cause soil deformation (e.g. earthworms, roots etc.) on soil structural development in wet soils, defined by changes in the soil porous architecture i.e. pore connectivity, pore shape and pore volume during a 24 week period. Three contrasting soil textures were examined and changes compared between field soil, sterilised soil and a glucose enhanced soil treatment. Our results indicate that soil biota can significantly alter their microhabitat by changing soil pore geometry and connectivity, primarily through localised gaseous release. This demonstrates the ability of microorganisms to modify soil structure, and may help reveal the scope by which the microbial-rich rhizosphere can locally influence water and nutrient delivery to plant roots. (C) 2014 Elsevier Ltd. All rights reserved.