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Plastic responses in tree architecture to different light intensity habitats: a case of Chinese cork oak

100%

Hu X., Zhang W., Zhou J.

Polish Journal of Ecology

2016

tom 64

nr 4

The capacity of plants to occupy different habitats is made possible by the plastic responses of their presenting in heterogeneous habitats. Light directly influences the plastic responses of plant architectural traits. We measured five years-old saplings of Chinese cork oak growing in different light intensity habitats (forest edge, forest gap and understory). A suite of architectural and leaf morphological attributes indicated a pronounced ability of Chinese cork oak to adapt to shade. Under low light intensity habitats, Chinese cork oak had a significant tendency to invest more in crown growth, characterized by the highest crown area, the lowest crown length ratio and the largest angle of the inclination of the main stem to the vertical. It expressed marked plagiotropic growth in shade indicating a horizontal light-foraging strategy. In addition, Chinese cork oak significantly exhibited the highest specific leaf area and the lowest total leaf area under low light intensity habitats. In shade, they showed some plasticity in displaying most of their leaf area at the top of the crown to minimize self-shading and to enhance light interception. This differentiation can be defined as a plastic phenomenon, likely related to the higher efficiency of light interception and absorption by saplings.

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The reproductive capacity of spider mites (Acari: Tetranychidae) population in single and multi-leader apple tree crowns of Elstar and Jonagold cvs

67%

Sosna I., Kelm M., Lenort M., Kadlubiec W.

Acta Scientiarum Polonorum. Hortorum Cultus

2014

tom 13

nr 5

The present study aimed at finding techniques alternative to chemical control, capable of reducing spider mite density. The experiment was carried out in 7 single-leader and 3 multi-leader training systems. The pest density was compared across the systems and between apple cultivars Elstar and Jonagold showing variable crown densities and trichome cover of leaves. The spider mite mobile stages were more abundant in singleleaders crowns, whereas more eggs were laid in multi-leader crowns. Nevertheless, the egg and the youngest stages survival was reduced in multi-leader crowns probably by the more intensive solar radiation reducing the air RH. The lowest pest abundance was found in the crowns of the V-Gćttingen system, and in the similar, stretched Tatura trellis 2-leader system. These types of crowns should be therefore recommended for integrated and organic apple production.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Hortorum Cultus

1 Polish Journal of Ecology

1 Hu X.

1 Kadlubiec W.

1 Kelm M.

1 Lenort M.

1 Sosna I.

1 Zhang W.

1 Zhou J.

1 2016

1 2014

Wyniki wyszukiwania

Plastic responses in tree architecture to different light intensity habitats: a case of Chinese cork oak

The reproductive capacity of spider mites (Acari: Tetranychidae) population in single and multi-leader apple tree crowns of Elstar and Jonagold cvs