Artigo Revisado por pares

Climate Influences on the Radial Growth of Centrolobium microchaete, a Valuable Timber Species from the Tropical Dry Forests in Bolivia

2010; Wiley; Volume: 43; Issue: 1 Linguagem: Espanhol

10.1111/j.1744-7429.2010.00653.x

ISSN

1744-7429

Autores

Lidio López, Ricardo Villalba,

Tópico(s)

Forest ecology and management

Resumo

In this study, we use tree-ring records to determine the climate factors controlling the growth of Centrolobium microchaete, a high-value timber species from the tropical dry Chiquitano forest in Bolivia. We present the first tree-ring chronologies from C. microchaete for Concepción and Santa Mónica, Bolivia. Statistical analyses show that the chronologies are of good quality and have a significant common signal between trees. The growth of C. microchaete is strongly influenced by climatic conditions during late spring–early summer. Abundant precipitations concurrent with below-average temperatures during this period of the year favor tree growth. Climate variations in late spring–early summer explain >40 percent of the total variance in C. microchaete tree growth during the interval 1943–2005. Minor differences in tree responses to climate recorded between the two stands may reflect differences in the extent of the dry season and in soil water capacity between sites. Although the chronologies cover the past 180 yr, adding samples from older individuals would permit the extension of these records further back in time. The strong climate dependency of tree growth suggests that predicted future climate changes in the region could have a significant influence on C. microchaete tree growth during the 21st century. En este estudio se emplean los anillos de los árboles para determinar los factores climáticos que controlan el crecimiento de Centrolobium microchaete, una especie de alto valor maderable proveniente de los bosques tropicales secos de la Chiquitanía en Bolivia. Se presentan las primeras cronologías de anillos de árboles de C. microchaete para las localidades de Concepción y Santa Mónica, Bolivia. Los análisis estadísticos muestran que las cronologías son de buena calidad y contienen una importante señal común entre árboles. El crecimiento de C. microchaete está fuertemente influenciada por las condiciones climáticas durante primavera-verano. Abundantes precipitaciones en conjunto con temperaturas por debajo del valor medio durante este período del año favorecen el crecimiento radial de los árboles. Las variaciones climáticas a finales de la primavera-comienzos del verano explican más del 40% de la varianza total en crecimiento de los árboles C. microchaete durante el intervalo 1943–2005. Pequeñas diferencias en las respuestas de los árboles al clima registradas entre los dos rodales pueden reflejar diferencias en la extensión de la estación seca y en la capacidad de retención de agua por el suelo entre ambos sitios. Aunque las cronologías solo cubren los últimos 180 años, la incorporación de muestras provenientes de individuos de edad avanzada permitirá extender estos registros dendrocronológicos más atrás en el tiempo. La fuerte dependencia climática del crecimiento de los árboles indica que los futuros cambios climáticos predichos para la región podrían tener una influencia significativa en el crecimiento de los ejemplares de C. microchaete durante el siglo 21. TABLE S1. Meteorological stations used in this study. FIGURE S1. Biogeographic provinces in Bolivia, South America. The Cerrado biogeography province (Navarro & Maldonado 2004) is delimited by a continuous thick black line, and the two biogeographical sectors (Chiquitano and Santa Cruz) within the Cerrado province separated by a dashed line. The four botanical districts in the Chiquitano sector are identified by their respective names. Location of the sampling sites (▴): 1. Concepción, 2. Santa Mónica. FIGURE S2. Climatic diagrams for the Guarayos and Concepción meteorological stations, Santa Cruz, Bolivia. The Concepción diagram is based on precipitation and temperature records from the interval 1943–2006. The precipitation and temperature records for Guarayos are from the intervals 1947–2006 and 1950–2006, respectively. The sources for the meteorological data are indicated in Table S1. Please note: Wiley-Blackwell is not responsible for the content or functionality of any supporting materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

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