Sap flux – a real time assessment of health status in Norway spruce

Autor:	Isabella Børja, Valeriy Nadezhdin, Nadezhda Nadezhdina, Jan Cermak, Jan Svĕtlík, Sabine Rosner
Rok vydání:	2016
Předmět:	0106 biological sciences Diagnostic methods biology Flux Forestry Picea abies Forest health biology.organism_classification Felling 010603 evolutionary biology 01 natural sciences Horticulture Botany Environmental science 010606 plant biology & botany
Zdroj:	Scandinavian Journal of Forest Research. 31:450-457
ISSN:	1651-1891 0282-7581
DOI:	10.1080/02827581.2015.1130851
Popis:	Top dieback of Norway spruce (Picea abies), triggered by drought in 2004–2006, has been observed in Southeast Norway and trees died within four years after appearance of the first symptoms. The aim of our study was to use sap flux measurements as a diagnostic method for assessment of tree vitality. We used the heat field deformation method to monitor the sap flux density (SFD) in four pairs of healthy and declining trees in situ. To provide retrospective information on hydraulic performance of the trees we took samples for wood anatomical analysis. After felling the trees we used the modified differential translucence method (MDT) as a proxy for the SFD measurements. Healthy trees had three times higher SFD values as declining trees. In some healthy trees we detected decreasing SFD with time. The MDT method agreed with the SFD measurements. In conclusion, we detected sap flux dysfunction in declining trees and showed that the SFD reduction may occur during a short period, prior to occurrence of an...
Databáze:	OpenAIRE
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