The uncoupling of secondary growth, cone and litter production by intradecadal climatic variability in a Mediterranean scots pine forest
| Autor: | y Jose Antonio Rodríguez, Fernando Valladares, Celia Martínez-Alonso, J. Julio Camarero, Manuel López Arias, Milagros Serrano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Mediterranean climate
Canopy Time series Chronological cluster Precipitation Management Monitoring Policy and Law Biology Litterfall Nutrient Arbol Nature and Landscape Conservation computer.programming_language geography Temperatures geography.geographical_feature_category Ecology Scots pine Temperature Forestry Pinus sylvestris Plant litter biology.organism_classification Old-growth forest Tree-ring width Agronomy Retranslocation Litter computer |
| Zdroj: | Repositorio de Resultados de Investigación del INIA Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria INIA Digital.CSIC. Repositorio Institucional del CSIC instname INIA: Repositorio de Resultados de Investigación del INIA |
| Popis: | 11 páginas, 7 figuras, 3 tablas. The relationships between climate variability and canopy dynamics (monthly litter production), chemical composition of the litter, secondary growth and female-cone production were studied in an old growth Scots pine (Pinus sylvestris) forest over the 1993–2003 period. The forest was located at a Mediterranean mountain site (Valsaín, Segovia, central Spain). The temporally explicit relationships between the mentioned variables were explored by chronological cluster of their time series. Mean air temperature significantly influenced litter production and its seasonal and intradecadal patterns. Seasonal patterns of litter N and P content were negatively correlated with litter production, exhibiting minima of 5.3 g kg−1 (N) and 0.5 g kg−1 (P) by the end of the summer and maxima of 15 g kg−1 (N) and 1.2 g kg−1 (P) during winter; these results are interpreted as retranslocation before needle shedding in summer and loss of green needles in winter respectively. In general the driest and hottest years (1994 and 1995) were associated with significantly decreased secondary growth in the next year, an increased cone production, and an increased nutrient loss due to the combined effect of an increased litter production and an increased nutrient concentration of the litter. Climatic changes during the early stages of cone formation that take place during the spring led to alterations in masting and in the tri-annual process of cone production. Since each parameter studied was differentially affected by climatic variability, the overall effect of the short-term climatic changes experienced by the Scots pine forest studied was an uncoupling of litter production, secondary growth, and reproduction. This study was made possible by an INIA doctoral fellowship to CMA and was supported by INIA-8149 PROECOFOREST, INIA-SC93-142 and INIA-SC97–067 projects. JJC acknowledges funding by an Aragon I + D contract. |
| Databáze: | OpenAIRE |
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