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To what extent do ageing and soil properties influence Amynthas khami cast properties? Evidence from a small watershed in northern Vietnam
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsoil.2020.103792
N. Bottinelli , J.L. Maeght , V.N. Tran Le , C. Boonchamni , T.T. Doan , T.M. Tran , H. Aroui Boukbida , L. Smaili , P. Jouquet

Abstract Understanding the variables explaining earthworm cast properties remains a key challenge in soil ecology. For this purpose, this study aimed to determine the relationships between the physical and chemical properties of earthworm casts and those of their surrounding soil environment. Surface earthworm casts (recently emitted or degraded) produced by the anecic earthworm Amynthas khami (Thai 1984) and adjacent topsoil aggregates without traces of earthworm activity were sampled in 50 different locations covering a small watershed in northern Vietnam. We determined the organic carbon content, the spectral signatures of aggregates and the humic index of organic matter via mid-infrared spectroscopy and analysis of pH, hydrophobicity, wet aggregate stability and bulk density of soil aggregates. While the physical properties of casts were not related to those of topsoil aggregates, correlations were measured between cast and topsoil aggregate chemical properties. The values of hydrophobicity, pH, bulk density and organic carbon were higher in casts than in topsoil aggregates, whereas the humic index values were lower in casts than in topsoil aggregates. No difference was measured between recent and degraded casts, with the exception of their spectral signatures. Interestingly, the effect of A. khami was more important in soils presenting a lower organic carbon content or higher humic index, whereas its influence on soil pH was constant (i.e., the same regardless of the pH of the topsoil). In conclusion, this study suggests a discrepancy between the impact of A. khami on soil physical and chemical properties. The results also show that the spatial variability of cast physical properties cannot be related with that of topsoil environment physical properties.

中文翻译:

老化和土壤特性在多大程度上影响 Amynthas khami 铸造特性?来自越南北部一个小流域的证据

摘要 理解解释蚯蚓粪特性的变量仍然是土壤生态学中的一个关键挑战。为此,本研究旨在确定蚯蚓粪的物理和化学特性与其周围土壤环境的物理和化学特性之间的关系。在覆盖越南北部一个小流域的 50 个不同地点,对由厌食蚯蚓 Amynthas khami(泰国 1984 年)和相邻表土聚集体产生的表面蚯蚓粪(最近排放或降解)进行采样,没有蚯蚓活动的痕迹。我们通过中红外光谱和土壤团聚体的 pH、疏水性、湿团聚体稳定性和容重分析确定了有机碳含量、团聚体的光谱特征和有机质的腐殖质指数。虽然铸件的物理性质与表土骨料的物理性质无关,但测量了铸件和表土骨料化学性质之间的相关性。浇铸中的疏水性、pH、堆积密度和有机碳值高于表土聚集体,而腐殖质指数值在浇铸中低于表土聚集体。除了它们的光谱特征外,在近期和退化的铸件之间没有测量到差异。有趣的是,在有机碳含量较低或腐殖质指数较高的土壤中,A. khami 的影响更为重要,而其对土壤 pH 值的影响是恒定的(即,无论表土的 pH 值如何,都相同)。总之,这项研究表明 A. khami 对土壤物理和化学特性的影响之间存在差异。
更新日期:2021-02-01
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