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Analyse rétrospective de la croissance radiale des chênes de la Forêt Domaniale de la Harth (Haut-Rhin)

Abstract : Oaks from the National Harth Forest have been severely affected from 1992 by the strong forest decline observed in all the Rhin Valley. This observation led the National Forest Office to install an ecological survey network. The present study uses 68 plots dominated by oak species. A previous leaf morphology analysis was performed on 10 oaks per plot to identify precisely the taxonomic status of each tree (Quercus petraea. Quercus robur and Quercus pubescensl. This identification concluded to a surprisingly high proportion of pedunculate oak (39% of the sample of trees and 61% of sessile or pubescent oaks) compared to the dry condition of this forest (Breda et aI., 1998). The retrospective analysis of these 680 oaks started in 1995 by dendrochronology on cores bored to the pith at DBH. In average, small annual ring widths were measured (mean ring width over the 1850-1994 period = 1.5 mm/year) with inter-annual variations in the range of 0.8 to 2.4 mm/year. Radial growth in oaks from the Harth Forest exhibits a period of decline from the last 20 years, but this depletion appears on the studied sample of trees not so negative and not so long than oldest sequences of growth decline like 1854-1874 or 1934-1954. Geographical situation of the plots within the forest induces differences in growth level of oaks. Both radial and high growth, as well in old period (1890-1945) as in recent time (19671994) are significantly lower in oaks from the north than those from the south of the forest. This difference is a consequence of more favourable climatic and site conditions in the south. Pedunculate oak is more affected by the actual reduction of radial growth than the sessile : pedunculate radial growth declines and differ significantly from sessile one since 1972, in both north and south of the Harth. The contribution of site factors in the level of growth is difficult to identify because of confusion of hydric and trophic parameters. The hydric fertility appears nevertheless more discriminant : so high extractable soil water is, so high radial growth is from a long time period (1950). In the opposite, the growth of trees from plots with low extractable water was strongly reduced since 1986. The decline of pedunculate oaks from sessile ones is older on plots with low extractable soil water. Oaks growing on acidicline to neutroacidicline sites have better growth since 1977. On theses sites. with both high trophic and hydric fertility, the decline of pedunculate oaks growth is more important and the gap between the two species is maximum. From management point of view, high competition between trees has a strong negative effect on the radial growth. Finally, the stronger depletion in recent radial growth was observed in coppice with standards stands.
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Submitted on : Sunday, June 7, 2020 - 4:11:25 PM
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  • HAL Id : hal-02843031, version 1
  • PRODINRA : 25989



Nathalie Bréda. Analyse rétrospective de la croissance radiale des chênes de la Forêt Domaniale de la Harth (Haut-Rhin). [Contrat] 1998. ⟨hal-02843031⟩



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