Which process limits the long-term productivity of ancient Andean terraced agricultural systems?

💡 Explanation

When terraced fields are continuously cropped, nutrient depletion occurs because essential elements like nitrogen and phosphorus are removed from the soil with each harvest, decreasing long-term fertility. Therefore, nutrient depletion poses a significant limitation, rather than seismic collapse, waterlogging, or species invasion, which rely on different environmental factors.

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