Abstract
Changes in mass and chemical composition of Pinus sylvestris senescent needles were studied over a 5 year period in Mediterranean (MF) and Continental forests (CF) in the Pyrenees under varying levels of thinning (P0: reference, no thinning; P20: removal of 20% basal area, P30: removal of 30% basal area). Decomposition rates were higher in MF (k = 0.423 year−1) than in CF (k = 0.245 year−1). However, the maximum decomposition limit was higher in MF (87.9%) compared to CF (78.1%). The relative importance and timing of rainfall, and cellulose and lignin abundance on the decomposition process was similar among both sites. However, air temperature and degree-days only affected CF (the colder site) during the initial stages of decomposition, while litter moisture was significant only in MF (the drier site) in the latter stages of decomposition. Nutrient and carbon dynamics showed temporal patterns similar to those reported in higher latitudes (except for Ca), however, indicators of N mineralization such as C/N and lignin/N at the study sites were lower than values reported in the literature. Decreases in decomposition rates after thinning were higher in MF than in CF, indicating that this ecosystem could, in the short term, be more sensitive to human intervention. Thinning had similar temporary qualitative effects at both sites, slowing decomposition, increasing N and P immobilization and decreasing Ca immobilization. However, quantitative effects of thinning were site dependent in that the magnitude of nutrient immobilization was higher in CF. A conceptual model is presented to explain effects of thinning on litter N dynamics. These temporary changes are not trivial as nutrient immobilization and accumulated organic matter losses over a thinning cycle may affect tree growth particularly during short rotations and intensive fast-growing plantations. Under similar nutrient availability conditions, sites where nutrient release occurs faster may show higher post-thinning tree growth rates.
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Acknowledgments
Thanks are due to the Government of Navarre for financial support and setting up the experimental plots. Special thanks to Fernando Puertas, Carmen Traver and Ana Iriarte for assistance at several stages of this work. Juan A. Blanco had financial support from a fellowship granted by the Spanish Ministry of Science and Technology. We thank Susana García, Pablo Pujol and staff at SAI for chemical analyses. Thanks are also due to Gary M. Lovett and two anonymous reviewers whose comments helped to greatly improve this paper. Last but not least, we thank Tanya Seebacher for her English grammar review.
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Blanco, J.A., Imbert, J.B. & Castillo, F.J. Thinning affects Pinus sylvestris needle decomposition rates and chemistry differently depending on site conditions. Biogeochemistry 106, 397–414 (2011). https://doi.org/10.1007/s10533-010-9518-2
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DOI: https://doi.org/10.1007/s10533-010-9518-2