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2 Polish Journal of Ecology

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Variation and correlations of leaf traits of two Taxus species with different shade tolerance along the light gradient

Liu W., Li S., Su L., Su J.

Polish Journal of Ecology

2013

Vol. 61, nr 2

329--339

The variations in leaf traits of Taxus species in different light conditions are still poorly understood. We sampled leaves of Taxus yunnanensis W. C. Chang L. K. Fu and Taxus chinensis var. mairei (Lemée and Lév.) W. C. Cheng and L. K. Fu along an illumination gradient (full daylight, 40–60% full daylight, <10% full daylight), and analyzed how seven leaf traits and their correlations changed under different light conditions. The leaf trait that showed the greatest variation was specific leaf area (SLA) for T. yunnanensis, followed by leaf dry mass (LM) for both taxa. The smallest variation was in leaf width (LW) for both taxa. Plasticities of all leaf traits in both taxa were higher than 50%, and those of leaf area (LA), LM and SLA were greater than 80%. The light gradient was positively correlated with leaf length (LL), LM, leaf dry matter content (LDMC), and leaf length to width ratio (LWR). LW and SLA were negatively correlated with the light gradient. Analyses of relationships among leaf traits showed that LM of T. yunnanensis, T. chinensis var. mairei and both taxa was positively correlated with LL, LW, LA, LDMC, and LWR, and negatively correlated with SLA under all light conditions. We concluded that leaf traits and their relationships were affected by light conditions.

Interaction between canopy tree species and European yew Taxus baccata (Taxaceae)

Iszkuło G., Boratyński A.

Polish Journal of Ecology

2004

Vol. 52, nr 4

523-531

The aim of the study was an examination of the thesis, that canopy tree genera (species) can have positive or negative influence on the germination of seeds and growth of seedlings and saplings of Taxus baccata. The species population spontaneously formed in the Kórnik Arboreum (W Poland) during last decades was the field of investigations. All yew individuals (including seedlings) were positioned and measured on two plots (area 1900 and 2000 m^2) permanently marked in the field. The crown ranges of canopy trees and tree-like yews were measured and projected on the maps. The numbers of seedlings, saplings and tree-like yews under canopies of particular tree genera were compared. The seeds of T. baccata germinated under canopies of all species, most abundantly under the canopy of Pseudotsuga and Abies, but also under mother trees. Seedlings older than 2 years were also most numerous under the canopy of conifferous trees, while the saplings under the canopy of broadleaved trees. The greatest numbers of tree-like individuals were found under Tilia and Carpinus species.