Assessing hydrological connectivity inside a soil by fast-field-cycling nuclear magnetic resonance relaxometry and its link to sediment delivery processes
Assessing hydrological connectivity inside a soil by fast-field-cycling nuclear magnetic resonance relaxometry and its link to sediment delivery processes
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DOI：
10.1007/s12665-017-6861-9
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发表时间：
2017-08
影响因子：
2.8
通讯作者：
P. Conte;C. Di Stefano;V. Ferro;V. Laudicina;E. Palazzolo
中科院分区：
文献类型：
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作者：
P. Conte;C. Di Stefano;V. Ferro;V. Laudicina;E. Palazzolo
连通性是一个通用概念，用于表示涉及环境系统要素之间物质转移的过程。“土壤内部的水文连通性”这一表述在这里被用来表示土壤内部的空间格局（即，结构连接性）与物理和化学过程相互作用（即，功能连通性）以便确定地下流（即，水转移），从而解释了由于地表径流（即，土壤颗粒转移）可能受到影响。本文探讨了土壤（HCS）内部的水文连通性及其在地块尺度上的泥沙输送过程的联系。在三个不同长度的地块的上游和下游端取样的土壤与每个地块末端的储罐中的沉积物一起收集。所有样品都通过传统的土壤分析进行分析（即，织构、具有衰减全反射、C和N元素含量的傅里叶变换红外光谱）和快场循环（FFC）核磁共振（NMR）弛豫测定法。结果表明，选择性侵蚀现象和泥沙输运是负责的沉积物样品中的粒度均匀性相比，上游和下游端土壤。此外，虽然结构连接是更有效的上游端土壤样品，功能连接出现更有效的下游端和沉积物样品。需要进一步的研究，以定量评估FFC NMR弛豫HCS评价。
Connectivity is a general concept used to represent the processes involving a transfer of matter among the elements of an environmental system. The expression “hydrological connectivity inside the soil” has been used here to indicate how spatial patterns inside the soil (i.e., the structural connectivity) interact with physical and chemical processes (i.e., the functional connectivity) in order to determine the subsurface flow (i.e., the water transfer), thereby explaining how sediment transport due to surface runoff (i.e., the soil particle transfer) can be affected. This paper explores the hydrological connectivity inside the soil (HCS) and its link to sediment delivery processes at the plot scale. Soils sampled at the upstream- and downstream-end of three different length plots were collected together with sediments from the storage tanks at the end of each plot. All the samples were analyzed by traditional soil analyses (i.e., texture, Fourier transform infrared spectroscopy with attenuated total reflectance, C and N elemental contents) and fast-field-cycling (FFC) nuclear magnetic resonance (NMR) relaxometry. Results revealed that selective erosion phenomena and sediment transport are responsible for the particle size homogeneity in the sediment samples as compared to the upstream- and downstream-end soils. Moreover, while structural connectivity is more efficient in the upstream-end soil samples, functional connectivity appeared more efficient in the downstream-end and sediment samples. Further studies are needed in order to quantitatively assess FFC NMR relaxometry for HCS evaluation.