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Data from: Reduced aboveground tree growth associated with higher arbuscular mycorrhizal fungal diversity in tropical forest restoration

Citation

Holste, Ellen K.; Holl, Karen D.; Zahawi, Rakan A.; Kobe, Richard K. (2016), Data from: Reduced aboveground tree growth associated with higher arbuscular mycorrhizal fungal diversity in tropical forest restoration, Dryad, Dataset, https://doi.org/10.7291/D1SQ34

Abstract

Establishing diverse mycorrhizal fungal communities is considered important for forest recovery, yet mycorrhizae may have complex effects on tree growth depending on the composition of fungal species present. In an effort to understand the role of mycorrhizal fungi community in forest restoration in southern Costa Rica, we sampled the arbuscular mycorrhizal fungal (AMF) community across eight sites that were planted with the same species (Inga edulis, Erythrina poeppigiana, Terminalia amazonia, and Vochysia guatemalensis) but varied twofold to fourfold in overall tree growth rates. The AMF community was measured in multiple ways: as percent colonization of host tree roots, by DNA isolation of the fungal species associated with the roots, and through spore density, volume, and identity in both the wet and dry seasons. Consistent with prior tropical restoration research, the majority of fungal species belonged to the genus Glomus and genus Acaulospora, accounting for more than half of the species and relative abundance found on trees roots and over 95% of spore density across all sites. Greater AMF diversity correlated with lower soil organic matter, carbon, and nitrogen concentrations and longer durations of prior pasture use across sites. Contrary to previous literature findings, AMF species diversity and spore densities were inversely related to tree growth, which may have arisen from trees facultatively increasing their associations with AMF in lower soil fertility sites. Changes to AMF community composition also may have led to variation in disturbance susceptibility, host tree nutrient acquisition, and tree growth. These results highlight the potential importance of fungal–tree–soil interactions in forest recovery and suggest that fungal community dynamics could have important implications for tree growth in disturbed soils.

Methods

Arbuscular mycorrhizal fungi (AMF) community data in relation to eight of the sites located near the town of Agua Buena (8° 44′ 36″ N, 82° 58′ 04″ W) and Las Cruces Biological Station (8° 47′ 7″ N, 82° 57′ 32″ W) in Coto Brus county in southern Costa Rica.  The eight sites included BR, SC, SP, AC, HR, OM, BB, and EC (renamed sites 1-8, respectively, in the published article). AMF community data included: percent colonization of host tree roots; identification of the fungal species associated with trees roots through DNA isolation; and spore density, volume, and identity in both the wet and dry seasons. Data also included average soil characteristics per sites (taken from 2012 dataset) and tree growth (as height and diameter at breast height per year) per tree species and site.

Funding

National Science Foundation, Award: NSF‐DEB 0918112