Competition between Nothofagus obliqua and Pinus ponderosa: effects on their growth and associated ectomycorrhizal communities
DOI:
https://doi.org/10.30550/j.lil/2093Keywords:
Competition, diversity, invasion, mycorrhizas, restorationAbstract
Plant competition can significantly influence plant growth and their symbiotic associations, which is particularly important in both ecological restoration and invasion processes. This study evaluated the effect of competition between Nothofagus obliqua and Pinus ponderosa on plant growth, colonization by ectomycorrhizal fungi, and the taxonomic and functional diversity of these symbionts growing in soils of native forest and pine plantation. The results showed that the growth of both species was greater in native forest soils, likely due to their higher nutrient content. However, contrary to expectations, the effect of competition was neutral or even positive, particularly for N. obliqua. These findings suggest a coexistence facilitated by differences in resource use strategies. Regarding mycorrhizas, each species exhibited higher colonization levels in soils previously dominated by its own species. Despite this, both soils showed distinctive taxonomic and functional compositions, with plantation soils exhibiting overall higher diversity. However, melanized fungi, crucial for coping with water stress, were absent in this soil. Our results highlight the invasive potential of P. ponderosa and the suitability of N. obliqua for restoring environments converted into pine plantations. Furthermore, these findings emphasize the importance of considering symbiotic fungal communities in such efforts, suggesting that mycorrhizal inoculum could be key to maximizing restoration success in degraded soils.
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