Relating soil organic matter composition to soil water repellency for soil biopore surfaces different in history from two Bt horizons of a Haplic Luvisol
Relating soil organic matter composition to soil water repellency for soil biopore surfaces different in history from two Bt horizons of a Haplic Luvisol
复制标题
将土壤有机质组成与历史上与 Haplic Luvisol 的两个 Bt 层不同的土壤生物孔表面的土壤防水性联系起来
DOI：
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
R. Horn
中科院分区：
文献类型：
--
作者：
C. Haas;H. Gerke;R. Ellerbrock;P. Hallett;R. Horn
以其高潜在防水性而闻名的有机物（OM）在生物孔壁上的沉积可以增强通过这些孔的优先流动。在这项研究中，OM组成确定漫反射红外傅里叶变换（DRIFT）光谱法与土壤斥水性（SWR）确定的座滴法，威廉板法，和吸附试验。我们假设化学组成（就潜在润湿性指数而言; a）与物理性质（即，接触角），（B）取决于生物孔壁的历史，以及（C）与大块土壤基质不同。因此，主要目的是确定与DRIFT光谱和SWR结构化土壤中确定的OM组成之间的关系。实验是在生物孔隙及其周围的土壤基质上进行的，这些生物孔隙及其周围的土壤基质是从具有3种不同生物孔隙历史（即，根通道、潜穴和根通道短期被寄生虫定殖）。在完整的生物孔表面的所有测量结果表明，与周围基质相比，生物孔壁表面的SWR更大，并且显示出更高比例的疏水官能团。用DRIFT光谱测定的OM组成与接触角（座滴法）相关（R2 > .7），这与润湿性降低的土壤的吸水性和Wilhelmy板法的结果一致。短期定植的蚯蚓洞穴表面的疏水性与亲水性组分（A/B）的比例在所有研究的生物孔表面中变化最大，这取决于土壤深度。对于该深度的生物孔表面，经常观察到>90°的接触角。研究结果还表明，蚯蚓可以通过破坏团聚体来降低土壤的SWR。
The deposition of organic matter (OM), which is known for its high potential water repellency, on biopore walls can enhance preferential flow through these pores. In this study, OM composition determined with diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was related to soil water repellency (SWR) determined with sessile drop method, Wilhelmy plate method, and sorptivity tests. We hypothesized that the chemical composition (in terms of potential wettability index; a) is related to the physical properties (i.e., contact angle) of biopore walls, (b) depends on the history of the biopore, and (c) differs from the bulk soil matrix. Thus, the main objective was to identify the relation between OM composition determined with DRIFT spectroscopy and SWR in structured soils. The experiments were carried out on biopores and their surrounding soil matrices, excavated from 2 depths of a haplic Luvisol, with 3 different biopore histories (i.e., root channels, earthworm burrows, and root channels that were short‐term colonized by an earthworm). All measurements at intact biopore surfaces indicated a larger SWR at the surface of biopore walls as compared with the surrounding matrices and showed a higher proportion of hydrophobic functional groups. The OM composition determined with DRIFT spectroscopy correlated (R2 > .7) with contact angles (sessile drop method) that is in line with results of both water sorptivity and Wilhelmy plate method for soils with reduced wettability. The surfaces of short‐term colonized earthworm burrows had the most varying hydrophobic to hydrophilic components (A/B)‐ratio of all investigated biopore surfaces depending on soil depth. For biopore surfaces at this depth, contact angles >90° were frequently observed. The results also indicate that earthworms can lower SWR by aggregate disruption.
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影响因子：
4.2
作者：
Ellerbrock
通讯作者：
Ellerbrock
影响因子：
2.3
作者：
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2.5
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6.5
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Kuzyakov, Yakov
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6.6
作者：
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