Which soil consequence occurred initially when pre-Columbian chinampa agriculture was established in shallow lake environments?

💡 Explanation

When constructing chinampas, the shallow lake environment results in continuously waterlogged soils, where anaerobic decomposition elevated soil the organic matter as faster decomposition does not occur because soil organisms respire more effectively with readily available free oxygen. Therefore elevated soil organic matter results rather than soil salinity, reduced nitrogen fixation or decreased phosphorus availability which require different environmental conditions or agricultural practices.

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