Autor: Cater, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Shoot morphology and leaf gas exchange of Fagus sylvatica as a function of light in Slovenian natural beech forests
Autorzy:: Cater, M.
Powiązania:: https://bibliotekanauki.pl/articles/41573.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: shoot
plant morphology
leaf
gas exchange
Fagus sylvatica
light
Slovenia
natural beech forest
beech forest
plant growth
Opis:: Five plots with young beech trees of the same age (13–15 years) were established to study the threshold, where plagiotropic growth becomes evident as the consequence of the reduced light intensity. Trees were equally distributed along the light gradient and were divided according to light conditions (Indirect Site Factor, ISF) into three groups of stand conditions: close canopy stand (ISF<20), edge (2025). Morphological and physiological responses of young beech were studied between managed and old growth forest and between different forest complexes (Pohorje and Kocevje region) on natural beech sites. Criteria for the plagiotrophic growth was the relation between tree length and tree height (l/h) under various light conditions. Under controlled conditions (temperature, flow and CO2 concentration, RH, light intensity) light saturation curves of leaf net photosynthesis were measured on same trees to compare both responses between different light categories and different plots within comparable light conditions. Our study confirmed different thresholds for morphologic response between two forest complexes as well as between old growth and managed forest. Results were in accordance with physiological responses: the value of limiting light for a plagiotropic response was lower in Kocevje (17% ISF) than on Pohorje (25% ISF).
Źródło:: Dendrobiology; 2010, 64
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Comparison of four methods for estimating relative solar radiation in managed and old-growth silver fir-beech forest
Autorzy:: Rozenbergar, D.
Kolar, U.
Cater, M.
Diaci, J.
Powiązania:: https://bibliotekanauki.pl/articles/41259.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: solar radiation
old-growth silver fir forest
beech forest
forest
light condition
forestry
hemispheric photography
Opis:: Methods based on the principle of hemispherical canopy projection, including hemispherical photography (digital andfilm), sensors like LAI 2000 (zenith cutoff anle 74,1°) andstable horizontoscope, represent less accurate, yet significantly less expensive andtime-consuming techniques for radiation measurements comparedto long-term measurement with a network of photosynthetically active radiation (PAR) sensors. With measurements taken at a single point in time they can provide reliable estimates of relative diffuse andd irect solar radiation andcan also be usedto estimate the light climate in different times of the year. The four above mentioned methods for solar radiation estimation were applied at the same points in gaps and under adjacent canopies in unevenaged, mixed Dinaric fir-beech and pure beech montane forests. Locations covereda range of radiation andstandstructure conditions. Data analyses showedgoodreliability of all four methods over the whole range (2–80%) of radiation conditions. The most comparable results come from LAI 2000 andfilm hemispherical photography (all R > 0.90). Digital hemispherical photography is an accurate andreliable (R = 0.89) replacement for film hemispherical photography, but the higher values estimatedfor direct radiation should be taken into account. Compared to the other three methods, the stable horizontoscope gives less accurate results, especially under canopies with poorly defined gaps. Our study showed that all four methods tested are suitable for estimating the solar radiation climate in gaps and stands with heterogeneous vertical structures, andhave potential value as a tool in decision making when practicing silviculture.
Źródło:: Dendrobiology; 2011, 65
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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