Leaf Phenological Responses of Juvenile Beech and Oak Provenances to Elevated Phosphorus

Author:

Bačurin Marko1,Bogdan Saša1ORCID,Katičić Bogdan Ida1,Sever Krunoslav1

Affiliation:

1. Forest Genetics, Dendrology and Botany Department, Faculty of Forestry and Wood Technology, University of Zagreb, 10000 Zagreb, Croatia

Abstract

The few studies dealing with leaf phenological responses to elevated nutrients in forest trees have given ambiguous results, i.e., while some reported delayed leaf-out and autumn leaf senescence, others reported advanced leaf phenology caused by increased nutrition. This study aimed to determine the effects of experimentally increased phosphorus (+P treatment) on the leaf phenologies of two juvenile provenances of common beech and sessile oak. Other objectives were to determine whether there were interspecific differences as well as intraspecific variations. Saplings were excavated in two mixed beech–oak stands and transplanted into four wooden boxes filled with a commercial soil substrate. Phosphorus fertilizer was added to two of the boxes, while the remaining boxes served as controls. Both species responded to +P treatment with advanced autumn leaf senescence in the first year of the experiment. Leaf senescence in common beech began significantly earlier, while in both species, the process was accelerated compared to that in the control. In the second year, the leaf senescence response to +P treatment was even more pronounced in both species. The +P effect on leafing phenology was absent in both common beech provenances and in an oak provenance. However, the other oak provenance showed advanced leafing, indicating the existence of intraspecific differences.

Funder

Croatian Science Foundation

Publisher

MDPI AG

Subject

Forestry

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