Тип публикации: статья из журнала
Год издания: 2019
Идентификатор DOI: 10.3832/ifor2809-011
Ключевые слова: Canopy Position, Drought, Crown Light Gradient, Needle Structure, Picea abies, Transpiration
Аннотация: Several studies have looked at how individual environmental factors influence needle morphology in conifer trees, but interacting effects between drought and canopy position have received little attention. In this study, we characterized morphological responses to experimentally induced drought stress in sun exposed and shaded currПоказать полностьюent-year Norway spruce needles. In the drought plot trees were suffering mild drought stress, with an average soil water potential at 50 cm depth of -0.4 MPa. In general, morphological needle traits had greater values in sun needles in the upper canopy than in shaded needles in the lower canopy. Needle morphology 15 months after the onset of drought was determined by canopy position, as only sun needle morphology was affected by drought. Thus, canopy position was a stronger morphogenic factor determining needle structure than was water availability. The largest influence of mild drought was observed for needle length, projected needle area and total needle area, which all were reduced by similar to 27% relative to control trees. Needle thickness and needle width showed contrasting sensitivity to drought, as drought only affected needle thickness (10% reduction). Needle dry mass, leaf mass per area and needle density were not affected 15 months after the onset of mild drought. Our results highlight the importance of considering canopy position as well as water availability when comparing needle structure or function between conifer species. More knowledge about how different canopy parts of Norway spruce adapt to drought is important to understand forest productivity under changing environmental conditions. Several studies have looked at how individual environmental factors influence needle morphology in conifer trees, but interacting effects between drought and canopy position have received little attention. In this study, we characterized morphological res
Журнал: IFOREST-BIOGEOSCIENCES AND FORESTRY
Выпуск журнала: Vol. 12
Номера страниц: 27-34
ISSN журнала: 19717458
Место издания: POTENZA
Издатель: SISEF-SOC ITALIANA SELVICOLTURA ECOL FORESTALE