Millimetre‐scale distribution of organic matter composition at intact biopore and crack surfaces
Millimetre‐scale distribution of organic matter composition at intact biopore and crack surfaces
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完整生物孔和裂缝表面有机质成分的毫米级分布
DOI：
10.1111/ejss.12098
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发表时间：
2013
影响因子：
4.2
通讯作者：
Ellerbrock
中科院分区：
文献类型：
--
作者：
Ellerbrock
结构地层以生物孔和收缩裂缝为特征，可能是渗流的优先通道。裂缝和生物孔的表面可能被粘土-有机物质包裹。利用中红外漫反射红外傅立叶变换（DRIFT）光谱在毫米尺度上研究了这种结构表面上空间分布的有机质（OM）组成。对完整的蚯蚓洞、根槽等生物孔和9个地下层的裂缝面进行了分析。样品分别来自耕地和森林的芦笋、芦笋、芦笋和cambisol，分别来自黄土、土壤、泥岩和石灰岩。为了更好地比较不同土壤，对DRIFT信号强度进行了粒径效应校正。用烷基（C - h）和羰基（C=O）官能团的比值（C - h /C=O）表征了OM的潜在润湿性（PWI）。生物孔表面的PWI大于裂缝表面和土壤基质，表明OM在生物孔表面的潜在润湿性较小。根系通道表面有机质的毫米尺度空间变异性特别大。与其他土壤类型相比，来自土壤衍生的luvisol样品具有较小的PWI（比来自黄土衍生的luvisol具有更大的潜在润湿性）。耕地露维醇裂缝表面的平均PWI小于森林露维醇样品。结果表明，完整结构表面OM性质的空间分布可能对描述优先流动过程中的吸附和传质过程具有重要意义。
Structured subsoil horizons are characterized by biopores and shrinkage cracks, which may serve as preferential flow paths. The surfaces of cracks and biopores may be coated by clay‐organic material. The spatially‐distributed organic matter (OM) composition at such structural surfaces was studied at the millimetre scale using diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy in the mid‐infrared range (MIR). Intact biopores such as earthworm burrows and root channels, and crack surfaces of nine subsoil horizons were analysed. The samples were from arable and forest Luvisols, one Regosol, one Stagnosol and Cambisols developed from loess, till, mudstone and limestone. For better comparison between soils, the DRIFT signal intensities were corrected for the particle‐size effects. The OM was characterized by the ratio between alkyl‐ (C–H) and carbonyl (C=O) functional groups (C–H/C=O), which represent an index of the potential wettability (PWI) of the OM. The PWI was larger for biopores than for crack surfaces and the soil matrix, indicating a smaller potential wettability of OM at biopore surfaces. The millimetre‐scale spatial variability of OM was especially large for the surfaces of root channels. Samples from till‐derived Luvisols had smaller PWI (with greater potential wettability than surfaces from loess‐derived Luvisols) than other soil types. The mean PWI of the arable Luvisol crack surfaces was less than that of the forest Luvisol samples. The results suggest that the spatial distribution of OM properties at intact structural surfaces may be important for describing sorption and mass transfer processes during preferential flow.
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影响因子：
2.9
作者：
Kaiser, M.;Ellerbrock, R. H.;Gerke, H. H.
通讯作者：
Gerke, H. H.
影响因子：
2.8
作者：
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通讯作者：
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影响因子：
2.9
作者：
M. Leue;H. Gerke;R. Ellerbrock
通讯作者：
R. Ellerbrock
影响因子：
2.8
作者：
Leue, Martin;Ellerbrock, Ruth H.;Gerke, Horst H.
通讯作者：
Gerke, Horst H.
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影响因子：
2.9
作者：
M. Leue;R. Ellerbrock;D. Bänninger;H. Gerke
通讯作者：
H. Gerke