Die Stammbastanalyse als Methode zur Beurteilung des Ernährungszustands von Coniferen

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Abstract
Stem phloem analysis as diagnostic tool to evaluate the nutritional status of conifersDuring late fall 1975 needles and stem phloem were sampled from 4–10 trees each on 44 experimental plots, belonging to five trials with fertilizer and sewage sludge application in Scots pine and Norway spruce stands in southern Germany. Treating the nutrient contents of both tissues by means of variance, regression and discriminant analysis gave evidence, that stem phloem analysis can be used effectively to evaluate the supply of those stands with N,P and Ca. Phloem analysis has several advantages as compared with traditional foliar analysis: Technical sampling difficulties in older stands as well as the hazard of dilution effects are smaller and the seasonal variation of nutrient contents seems to be less pronounced. Preliminary phloem threshold levels for N and P deficiency with pine may lie around 0,46 and 0,07%, respectively. There is some indication, that spruce suffers from N deficiency if the nitrogen content of its phloem is below 0,42%.