Julián Rodríguez-Souilla, María V. Lencinas, Juan M. Cellini, Jimena E. Chaves, Fidel A. Roig, Pablo L. Peri, Guillermo J. Martínez Pastur
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引用次数: 1
Key Message
Seed fall and leaf litter production are linked by a source–sink limitation relationship in unharvested areas. The magnitude of these relationships varied differently according to the retention levels over the years-after-harvesting.
Abstract
Seed fall and leaf litter influence forest regeneration, nutrient cycling, and other key ecological processes closely related to forest management. In Patagonian forests, variation of both managed and unmanaged forests over the years can influence their resilience, where the sustainability implications of harvesting are not fully understood. The aim was to analyse the relationship between seed fall and leaf litter in variable retention harvesting and unmanaged Nothofagus pumilio forests in the medium term. Seed production (S) and leaf litter (LL) in primary unmanaged forests and three retention types were measured over the years after harvesting (YAH). Two indexes (SI, LLI) were calculated based on basal area for both S and LL. Due to harvesting, forest structure varied between retention levels. Both seed production and leaf litter decreased in managed forests, but statistical differences were not found when comparing SI. In addition, LLI was higher in the harvested areas. Forest harvesting progressively showed an increase in LLI values over the YAH, but SI maintained similar values. For all forest types, LLI presented higher values for years with low SI, and this could be linked with a source–sink limitation relationship. Finally, managed forests provide higher values of LLI for similar values of SI, contributed mainly by unmanaged areas. Seed fall and leaf litter production evidenced alterations in the medium term after harvesting. These findings have important implications for the adjustment of forest management practices, and for the understanding of the regulation and support of ecosystem service provision.
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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