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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Spatial variability of acid sulphate soils in the Plain of Reeds, Mekong delta, Vietnam.
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Spatial variability of acid sulphate soils in the Plain of Reeds, Mekong delta, Vietnam.

机译：越南湄公河三角洲芦苇平原酸性硫酸盐土壤的空间变异性。

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At all scales (delta-wide to individual fields) the acid sulphate soils of the Mekong delta show high spatial variability and closely intertwined soil types. Focusing on the field level in the Plain of Reeds, clear correlations are observed betweensoil physical and chemical characteristics, natural vegetation, groundwater table and microelevation. On locations >85 cm above mean sea level, Typic Sulfaquepts are covered with Ischaemum spp. (grass). Highly organic and hydromorphic Hydraquentic Sulfaquepts are found in at sites <75 cm above mean sea level, where Eleocharis spp. (reeds) are dominant. In between, soils and vegetation present intermediate characteristics. These correlations, the high spatial variability and the soil patterns are explained by soil genesis. Because of longer and stronger evaporation on high locations as compared with low locations, small differences in elevation can lead to important differences in water table level and therefore redox condition. Over long periods, thesedifferences greatly influence soil development and thus, soil types. Hydraquentic Sulfaquepts can be considered at an intermediate stage of development and are expected to develop into Typic Sulfaquepts upon further drainage. Rice growth is strongly influenced by soil characteristics and redox conditions. As a consequence, rice yields are correlated with microelevation. Correlations between elevation, soil characteristics and natural vegetation can facilitate mapping of these highly variable soils. Integration of soil and water variability in the research programmes and use of adapted methods not only increase research efficiency but also make it possible to use this variability to better understand soil genesis and agronomic processes.
机译：湄公河三角洲的酸性硫酸盐土壤在所有规模上（从三角洲到各个田地）都表现出高度的空间变异性和紧密交织的土壤类型。着眼于芦苇平原的田间水平，观察到土壤理化特性，天然植被，地下水位和微海拔之间的明确关联。在高于平均海平面85厘米的位置，典型的Sulfaquepts被Ischaemum spp覆盖。 （草）。在海拔平均高度低于75厘米的Eleocharis spp处发现了高度有机和水溶的拟南芥。 （芦苇）占主导地位。在这两者之间，土壤和植被呈现出中间特征。这些相关性，高空间变异性和土壤模式可以通过土壤成因来解释。由于高处的蒸发量比低处的蒸发量更长且更强，因此海拔高度的细微差异可能会导致地下水位高度差异，从而导致氧化还原条件。长期以来，这些差异极大地影响了土壤发育，进而影响了土壤类型。可能在开发的中间阶段就出现了硫磺化古猿，并有望在进一步排水的情况下发展成典型的硫磺化古猿。水稻生长受到土壤特性和氧化还原条件的强烈影响。结果，水稻产量与微海拔高度相关。海拔，土壤特性与自然植被之间的相关性可以帮助绘制这些高度变化的土壤。将土壤和水的变异性整合到研究计划中，并采用适当的方法，不仅可以提高研究效率，而且可以利用这种变异性更好地了解土壤的起源和农艺过程。

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