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首页> 外文期刊>Applied and environmental soil science >Spatial Variability of the Physicochemical Properties of Soils from Seasonally Flooded Forest Fragments on a Tropical Plain
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Spatial Variability of the Physicochemical Properties of Soils from Seasonally Flooded Forest Fragments on a Tropical Plain

机译：在热带平原上季节性淹水森林碎片土壤物理化学特性的空间变异性

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Flooded ecosystems are conditioned to seasonal floods that promote specific soil conditions, such as low oxygen, hydromorphism, and peculiar chemical reactions. These environments are dependent on flood pulses that determine specific ecological conditions. Ipucas are seasonally flooded discontinuous forest patches that occur exclusively in the Araguaia Plain in Central Brazil. They are located 0.40 to 1.20 m lower than the surrounding plain, which promotes an accumulation of rainwater for five to six months of the year, being entirely or partially dry during the dry season. The aim of this study was to evaluate the horizontal (centre and edge) and vertical (depths: 0-0.20 m and 0.20-0.40 m) variability of physicochemical parameters in Ipucas soils, attempting to establish the importance of flood pulses and the leaching of surrounding areas in soil formation and composition. Samples were collected during the dry season in three Ipucas of similar size and circularity using a Dutch auger. The results reveal that flood pulses promote the deposition of sediments eroded from the surrounding plain, homogenizing the characteristics of the surface soil, from the edge to the centre of the Ipucas. However, biogeochemical processes, also linked to temporary flooding, account for the differences between the surface and deeper soil horizons because anoxic conditions during flooding promote chemical reactions characteristic of anaerobic environments, modifying the pH and organic matter content, in addition to the gleying of soils subjected to flooding, which are then covered by sediments after the dry season. Finally, Ipucas soils are susceptible to anthropic changes and are dependent on seasonal flood pulses.
机译：被淹没的生态系统被调节到季节性洪水，促进特定的土壤条件，例如低氧气，湿形式和特殊的化学反应。这些环境取决于确定特定生态条件的洪水脉冲。 Ipucas是季节性淹没的不连续的森林补丁，其在巴西中部的Araguaia平原中出现。它们比周围平原低0.40至1.20米，促进了今年五到六个月的雨水的积累，在干燥的季节完全或部分干燥。本研究的目的是评估Ipucas土壤中物理化学参数的水平（中央和边缘）和垂直（深度：0-0.20 m和0.20-0.40米），试图确定洪水脉冲和浸出的重要性土壤形成和组成的周边地区。使用荷兰语螺旋钻，在三种类似尺寸和圆形的三种型上的干燥季节收集样品。结果表明，洪水脉冲促进了沉积物沉积从周围平原侵蚀，均质地均化表面土壤的特性，从灰尘的边缘到中心。然而，生物地球化学过程，也与临时洪水相关联，占地表和更深的土壤视野之间的差异，因为血液促进过程中的缺氧条件促进了厌氧环境的化学反应，修改了pH和有机物质含量，除了土壤的歌味受到洪水，然后在干燥的季节后被沉积物覆盖。最后，Ipucas土壤易受人体变化的影响，依赖于季节性洪水脉冲。

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