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首页> 美国卫生研究院文献>Elsevier Sponsored Documents >Assessing the long-term effects of zero-tillage on the macroporosity of Brazilian soils using X-ray Computed Tomography
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Assessing the long-term effects of zero-tillage on the macroporosity of Brazilian soils using X-ray Computed Tomography

机译：使用X射线计算机断层扫描技术评估零耕对巴西土壤大孔隙度的长期影响

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Zero-tillage (ZT) is being increasingly adopted globally as a conservationist management system due to the environmental and agronomic benefits it provides. However, there remains little information on the tillage effect on soil pore characteristics such as shape, size and distribution, which in turn affect soil physical, chemical and biological processes. X-ray micro Computed Tomography (μCT) facilitates a non-destructive method to assess soil structural properties in three-dimensions. We used X-ray μCT at a resolution of 70 μm to assess and calculate the shape, size and connectivity of the pore network in undisturbed soil samples collected from a long-term experiment (~30 years) under zero tillage (ZT) and conventional tillage (CT) systems in Botucatu, Southeastern Brazil. In both systems, a single, large pore (>1000 mm3) typically contributed to a large proportion of macroporosity, 91% in CT and 97% in ZT. Macroporosity was higher in ZT (19.7%) compared to CT (14.3%). However the average number of pores was almost twice in CT than ZT. The largest contribution in both treatments was from very complex shaped pores, followed by triaxial and acircular shaped. Pore connectivity analysis indicated that the soil under ZT was more connected that the soil under CT. Soil under CT had larger values of tortuosity than ZT in line with the connectivity results. The results from this study indicate that long-term adoption of ZT leads to higher macroporosity and connectivity of pores which is likely to have positive implications for nutrient cycling, root growth, soil gas fluxes and water dynamics.
机译：零耕（ZT）由于其提供的环境和农艺效益，在全球越来越多地被用作保护主义者的管理体系。但是，关于耕作对土壤孔隙特征（如形状，大小和分布）的影响的信息很少，而耕作对土壤的物理，化学和生物过程产生影响。 X射线微计算机断层扫描（μCT）促进了一种无损评估土壤结构特性的三维方法。我们使用分辨率为70μμm的X射线μCT来评估和计算在零耕种（ZT）和常规条件下通过长期实验（〜30 years）收集的未扰动土壤样品中孔隙网络的形状，大小和连通性巴西东南部Botucatu的耕作（CT）系统。在这两个系统中，单个大孔（> 1000 mm 3 ）通常会造成很大一部分的大孔隙，其中CT占91％，ZT占97％。与CT（14.3％）相比，ZT的大孔率更高（19.7％）。然而，CT的平均孔数几乎是ZT的两倍。在这两种处理中，最大的贡献来自形状非常复杂的孔，其次是三轴和非圆形。孔隙连通性分析表明，ZT下的土壤比CT下的土壤更紧密。根据连通性结果，CT下的土壤曲折度值大于ZT。这项研究的结果表明，长期采用ZT会导致较高的大孔隙度和孔隙连通性，这可能对养分循环，根系生长，土壤气体通量和水动力学产生积极影响。

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