Which environmental consequence decreased long-term chinampa field productivity within the Valley of Mexico?

💡 Explanation

When populated regions expanded, increased waste runoff led to intensified eutrophication in chinampa canals, because nutrient overload encourages excessive algae growth, depleting oxygen and harming crops. Therefore, eutrophication lowered productivity, rather than salinization, desertification, or volcanic deposition which were less relevant in well-managed chinampa systems.

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