Growth, biomass, carbon and nutrient pools in Gmelina arborea established in pure and mixed forest stand production systems in Mexico
2022
Ruiz-Blandon, Bayron Alexander | Salcedo-Pérez, Eduardo | Rodríguez-Macías, Ramón | Hernández-Álvarez, Efrén | Campo, Julio | Merino, Agustín
Melina (Gmelina arborea) is a fast-growing tree species that is widely used throughout the world for various purposes. The aims of this research were to evaluate the biomass production and C and nutrient pools in G. arborea established in a 15-year-old pure stand (PS) and a mixed stand (MS) in the State of Nayarit, Mexico. Three sampling plots of 1000 m² were established in each type of stand. The diameter and height of the trees were measured and used to calculate biomass. Forest floor and mineral soil were also sampled. G. arborea represented 40% of the total tree volume in the MS but exhibited a larger diameter (12%) and basal area (11%) per tree in this stand. The productivity in the MS was 27% higher, having mineral soil with a better pH and C:N ratio than in the PS. The MS also contained 44.1% more biomass and 20.3% more C storage than the PS. The forest floor mass (1.3 Mg ha⁻¹) and C (1 Mg ha⁻¹) and N (0.3 Mg ha⁻¹) pools in the MS were higher than in the PS. The mineral soil of both forest stands stored similar C pools. Overall (tree biomass + forest floor + mineral soil), the MS stored more N (13.0%), P (41.7%), K (25.1%), Fe (76.8%), Cu (41.5%) and Zn (38.7%). The arrangement and silvicultural management of stands directly affects dendrometric, biomass production, and C and nutrient pools, but the mineral soil contribution to nutrient buffering will depend on its quality and properties.
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