Successional changes in vegetation and litter structure in traditional Lacandon Maya agroforests

摘要

The Lacandon Maya is an indigenous group who live in Chiapas, Mexico. Their traditional lifeways involve swidden, sequential agroforestry management that mimics ecological disturbance and modifies succession. Lacandon farmers use fire to clear small plots for polyculture milpa agroforests, which they subsequently fallow. They actively manage all stages of their agroforests to provide ecosystem services and facilitate site recovery. However, it is unclear whether or how quickly the ecosystem structure of Lacandon agroforests matches that of a mature forest. Therefore, this study quantified canopy cover, basal area, ground cover, and litter layers and depth to empirically evaluate successional trends in vegetation and litter structure. Our results show that the Lacandon agroforest structure typically recovers to mature forest levels, but the speed and nature of this recovery vary by metric. They also indicate Lacandon traditional agroforestry is predicated on nuanced understanding of tropical forest successional dynamics, as illustrated by Lacandon farmers' recognition of successional stages that correspond to patterns in vegetation and leaf litter structure. As such, Lacandon ecological knowledge has the potential to facilitate the restoration of degraded tropical forests in Chiapas, Mexico. However, our findings also demonstrate that shortening fallow periods will undermine the ecological integrity of this traditional agricultural system.