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Thursday, 6 October 2016
Understanding drivers of forest diversity and structure in managed landscapes: Secondary forests, plantations, and agroforests in Bangladesh
Published Date 15 April 2016, Vol.366:118–134,doi:10.1016/j.foreco.2016.01.024
Shimona A. Quazi,
Department of Botany, University of Hawai’i at Mānoa, 3190 Maile Way, Honolulu, HI 96822, USA
Received 7 October 2015. Revised 9 January 2016. Accepted 18 January 2016. Available online 16 February 2016.
We compared tree structure, tree diversity, and avian richness in three forest types.
Agroforests had higher canopy tree richness and diversity than secondary forests.
Agroforest had far lower sapling regeneration than secondary forest and plantations.
Bird species richness was highest in secondary forests with high canopy richness.
Agroforests may provide habitat for some, not all, secondary forest species.
Managed forests in protected area landscapes may extend the conservation functions of nature reserves, but studies comparing biodiversity between managed forest types have not examined the underlying factors that drive existing patterns. We used linear mixed effects models to test the effects of a suite of biotic and abiotic factors on structure and diversity across both plants and birds in complex agroforests, mixed plantations, and mature secondary forests of the same age in northeastern Bangladesh. We measured woody species structure and composition in 18 0.01-ha plots in each forest type across three forest ranges, and conducted bird surveys using 216 point count stations located among the vegetation plots. Tree species richness and diversity, and avian richness in agroforests were higher than, or similar to secondary forests. However, saplings in agroforests and plantations had lower densities and fewer species than secondary forests, and both managed forest types had reduced regeneration. Our results indicate that agroforests have higher potential to conserve late secondary forest species than plantations, due to specific management practices that manipulate light. This work provides quantitative evidence for the utility of traditional agroforests as a conservation tool, even under high levels of human disturbance. Inadequate evidence has been a key limitation to conservation policy planning in landscapes with both high biodiversity and high human density. We find that managed traditional agroforests are an underutilized option in the conservation of protected areas in a landscape that is characterized by human use.