Dual-scale micro-CT assessment of soil structure in a long-term fertilization experiment
Dual-scale micro-CT assessment of soil structure in a long-term fertilization experiment
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DOI：
10.1016/j.geoderma.2013.04.012
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发表时间：
2013-08-01
期刊：
影响因子：
6.1
通讯作者：
Morari, F.
中科院分区：
文献类型：
--
作者：
Dal Ferro, N.;Charrier, P.;Morari, F.
在这项研究中，我们使用X射线显微断层扫描（micro-CT），以评估3D孔径分布和形态的原状土芯（5厘米直径，6厘米长）和聚集体（筛分在5-6毫米）。样本收集于1962年在意大利东北部建立的一项长期施肥实验，该实验考虑了有机（农家和液体肥料）和矿物处理。这项工作的目的是评估土壤有机碳（SOC）的双尺度效应，以影响6.25-2000亩范围内的孔隙网络，并测试的敏感性形态特征（连通性，各向异性程度，分形维数）作为指标的土壤质量管理措施。孔隙形态的结果表明，连通性是一个敏感的指标来区分管理措施的影响。土壤结构是多重分形的，并没有突出处理之间的任何差异。土壤有机碳对土壤孔隙分布有一定影响，使>560 μ m的孔隙增加，而80-320 μ m的孔隙减少。相比之下，团聚体孔隙度，在12.5-200 μ m的范围内，受SOC和管理措施的影响很小。最有可能的是，低仪器分辨率将掩盖其影响，因为以前的研究在相同的土壤进行了显着的影响，土壤微孔隙度（0.0074-100 μ m）的管理措施。因此，这些数据的整合，在相同的地块在以前的研究中获得的，突出了SOC的双重影响，因为它影响了土壤结构在微观和宏观尺度。(C)2013爱思唯尔有限公司版权所有。
In this study we used X-ray microtomography (micro-CT) to evaluate the 3D pore size distribution and morphology of both undisturbed soil cores (5 cm diameter, 6 cm length) and aggregates (sieved at 5-6 mm). Samples were collected in a long-term fertilization experiment, established in 1962 in northeastern Italy, which considers organic (farmyard and liquid manure) and mineral treatments. The aim of the work was to assess the dual-scale effect of soil organic carbon (SOC) to influence the pore network in the range 6.25-2000 mu m and to test the sensitivity of morphological features (connectivity, degree of anisotropy, fractal dimension) as indices of soil quality to management practices. Results on pore morphology suggested that connectivity was a sensitive index to differentiate the effects of management practices. Soil structure was multifractal and did not highlight any difference between treatments. Pore size distribution was affected by SOC as it increased the pores >560 mu m of soil cores and, at the same time, decreased the pores in the range 80-320 mu m. By contrast aggregate porosity, in the range 12.5-200 mu m, was weakly affected by the SOC and management practices.Most likely the low instrumental resolution would mask their effects since previous studies conducted on the same soils showed a significant effect of the management practices on soil microporosity (0.0074-100 mu m). Therefore the integration of these data, with those obtained in the same plots in previous studies, highlighted the dual effect of SOC as it affected the soil structure at both micro- and macroscale. (C) 2013 Elsevier B.V. All rights reserved.