Examinando por Materia "Forest plantations"

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Características anatómicas y propiedades físicas de la madera de Cedrela odorata L., de 22 años, San Gabán – Perú
(Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas (UNTRM), 2020-12-31) Anquise Ticahuanca, Ruben César; Ccahuana Jihuallanca, Ever Ángel; Portal Cahuana, Leif Armando
El presente estudio tuvo como objetivo general describir las características anatómicas y las propiedades físicas bajo el método no destructivo de los árboles semilleros de Cedrela odorataL., de 22 años en el Anexo Experimental INIASan Gabán – Pampa Alegre. Se colectaron ocho árboles de la especie cedro, seleccionados siguiendo los criterios de la NTPN°251.008: 2012, donde se consideraron aspectos generales, fitosanitarios, y dasométricos, entre otros. Posteriormente, se seleccionaron por cada árbol dos muestras empleando el barreno de Pressler. Se determinaron las 3características macroscópicas, microscópicas, contenido de humedad, las densidades, el peso calculado de 1 my 1 pie tablar al 12% de contenido de humedad. Los resultados acerca de las características anatómicas mostraron diferencias en cuanto al diámetro tangencial de los poros, que fue menor que el promedio (133.20 μm), respecto a la información científica existente sobre anatomía del cedro. Las propiedades físicas mostraron que Cedrela odorataL., a los 22 años se clasifica como madera de densidad básica baja, en comparación con estudios de cedro en bosque natural, donde su clasificación es de densidad básica media.
Impact of light conditions on the early development of Cinchona officinalis
(Universidad Nacional de Colombia, 2024-01-01) Vaca Marquina, Segundo Primitivo; Arteaga Cuba, Marcela Nancy; Tafur Santillan, Segundo Medardo; Huaccha Castillo, Annick Estefany; Fernandez Zarate, Franklin Hitler
Cinchona officinalis, a native plant species known in Peru as the cinchona tree, has civic importance because it represents the plant wealth of this nation and medicinal importance since it was for more than 300 years the only cure for malaria, and is currently threatened. The aim was to determine the effect of light conditions on the percentage of mortality, height increase, and diameter increase of Cinchona officinalis. In the community of La Cascarilla (5°39’48.87 “S 78°54’35.24 “W), two treatments were installed, forest massif (FM) and enrichment bands (EB). For each treatment, three replicates and 16 plants per replicate were used. Monthly evaluations were carried out in which the number of dead plants, plant height, and diameter were recorded. These parameters were correlated with precipitation, temperature, and photoperiod records of the study area. The results showed that mortality in FM was 27.1% higher than that reported in EB, while the increase in height and diameter increment in the FM plot was 45.5 and 25.1% higher than that obtained in EB. In addition, a negative correlation was observed between the percentage of mortality and precipitation (rs=- 0.54), and between the increase in height and diameter increment with the maximum temperature (rs=-0.73 and rs=-0.60, respectively) for the FM treatment, while for the EB treatment, there was a negative correlation between the increase in height and precipitation (rs=-0.55) and a positive correlation between the diameter increment and the minimum temperature (rs=0.53). In general, shaded conditions allow a higher survival rate at the cost of reducing height and diameter increment.