2003
DOI: 10.1051/forest:2003012
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Needle longevity, shoot growth and branching frequency in relation to site fertility and within-canopy light conditions in Pinus sylvestris

Abstract: -Changes in needle morphology, average needle age, shoot length growth, and branching frequency in response to seasonal average integrated quantum flux density (Q int ) were investigated in Pinus sylvestris L. in a fertile site (old-field) and an infertile site (raised bog). In the fertile site, the trees were 30 years old with a dominant height of 17-21 m, and with average ± SD nitrogen content (% of dry mass) of 1.53 ± 0.11 in the current-year needles. In the infertile site, 50 to 100-yr-old trees were 1-2 m… Show more

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Cited by 67 publications
(54 citation statements)
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“…These results, while confirming previous observations on the same species [6,24,25,31], indicate no major difference in the plasticity of response to light -at the crown, shoot and needle level -between Norway spruce and silver fir saplings.…”
supporting
confidence: 82%
See 1 more Smart Citation
“…These results, while confirming previous observations on the same species [6,24,25,31], indicate no major difference in the plasticity of response to light -at the crown, shoot and needle level -between Norway spruce and silver fir saplings.…”
supporting
confidence: 82%
“…However, the relationships between light and growth or morphological parameters are far to be fully understood. Other than to be species-specific, for a certain species these relationships may vary among climatic regions [34] and may be greatly affected by the interaction with other factors 270 G. Grassi, R. Giannini such nutrient availability, sapling size and competition [8,10,16,25,[31][32][33]. This complexity becomes especially relevant in uneven-aged managed forests, where the high structural fragmentation of the canopy and the clustering pattern of natural regeneration [15] lead to a high spatial variability of light in the understory and of competition between saplings.…”
Section: Introductionmentioning
confidence: 99%
“…High shoot formation and growth at the top of the crown has previously been shown and associated with good light conditions (e.g. Mäkinen 1999;Goulet et al 2000;Takenaka 2000;Kaitaniemi and Ruohomäki 2003;Niinemets and Lukjanova 2003) and hydraulic preference (Goulet et al 2000;Nikinmaa et al 2003). The strongest growing shoot individuals are situated under better light conditions, i.e.…”
Section: Crown Architecture and Competition Intensitymentioning
confidence: 99%
“…Similarly, branch number per crown length was highest with Siberian larch and lowest with silver birch as neighbors. Potential differences in light interception between birch and larch as neighbors could explain the flexible adjustment of shoot length, because pine shoots respond positively to irradiance levels, especially at fertile sites (Niinemets and Lukjanova, 2003).…”
Section: Discussionmentioning
confidence: 99%