Journal
FOREST ECOLOGY AND MANAGEMENT
Volume 295, Issue -, Pages 97-108Publisher
ELSEVIER
DOI: 10.1016/j.foreco.2012.12.049
Keywords
Crown structure; Allometry; Competition reduction; Stress gradient hypothesis; Optimal partitioning theory; Mixing effects
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Funding
- German Science Foundation (Deutsche Forschungsgemeinschaft) as a part of the Collaborative Research Centre 607 [Sonderforschungsbereich SFB 607]
- Bavarian State Ministry for Nutrition, Agriculture and Forestry [W 07]
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The question how tree species allometry in mixed stands differs from pure stands is approached by analyzing how crown morphology of European beech (Fagus sylvatica L.) behaves in intra- versus interspecific neighborhoods. Based on long-term experimental plots with individual tree records on tree allometry and competition, our results revealed that (i) in pure stands crown allometry of beech is far from constant, but closely related to intraspecific competition, (ii) in mixed stands crown allometry of beech is considerably modified by competition reduction when growing in the vicinity of spruce, oak or pine, and (iii) crown extension due to competition reduction by interspecific neighbors increases with site fertility. Implications for the allometric theory, the stress-gradient hypothesis and a general understanding/conceptual model for mixing reactions are discussed. (C) 2013 Elsevier B.V. All rights reserved.
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