Which risk increased during pre-Columbian chinampa cultivation when canals experienced excessive nutrient loading?

💡 Explanation

When excessive nutrients enter chinampa canals, anaerobic digestion increases because bacteria decompose organic matter in oxygen-deprived conditions, generating methane. Therefore increased methane production results, rather than intrusion, fixation, or leaching, each requiring distinct environmental conditions and geochemical processes.

• Which outcome arises from the presence of decaying organic matter within a pre-Columbian chinampa system?
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