NDLI: Substrate acidity, nutritional status and growth of young Norway spruce(Picea abies [L.] Karst.) trèes in subalpine regions of the Bavarian Forest (Bavaria, Germany) as influenced by repeated NH4NO3 application

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Substrate acidity, nutritional status and growth of young Norway spruce(Picea abies [L.] Karst.) trèes in subalpine regions of the Bavarian Forest (Bavaria, Germany) as influenced by repeated NH4NO3 application — results of a container experiment

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Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 117

Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 116

Substrate acidity, nutritional status and growth of young Norway spruce(Picea abies [L.] Karst.) trèes in subalpine regions of the Bavarian Forest (Bavaria, Germany) as influenced by repeated NH4NO3 application — results of a container experiment

Content Provider	Springer Nature Link
Author	Wölfle, Claudia Häberle, Karl Heinz Kölling, Christian Rehfuess, K. E.
Copyright Year	2000
Abstract	Junge Klon-Fichten, die in großvolumigen (40 L.) Containern in humusarmen, Aluminium-gesättigeten Unterböden einer Podsol-Braunerde aus Granit wurzelten, wurden in 1300 und 1150 m ü.NN am Dreisessel/Bayerischer Wald vier Jahr lang mit dreifach gestaffelten Ammoniumnitratgaben gedüngt (N+, N++, N+++). Als Kontrolle diente eine Variante, bei der die schwächste N-Stufe mit einer MgSO4-Düngung gekoppelt war (N+Mg+).Wiederholte reine N-Düngung reduzierte die Gehalte des Substrats an NH4Cl-austauschbarem Mg, die Mg-Sättigung der Austauscher, die Mg-Gehalte in den Nadeln und Wurzeln und löste typische Mg-Mangelsymptome an älteren Nadeln aus. Demgegenüber waren die Fichten des Versuchsglieds N+Mg+ ausgewogen ernährt. Die Biomasseproduktion (Nadeln, Sproßachsen und verschiedene Wurzelfraktionen) wurden durch die Behandlungen jedoch nicht beeinflußt.Offenbar reichte unter den rauhen Klimabedingungen der Hochlagen während der eigentlichen Düngungsphase schon die niedrigste N-Gabe für ein befriedigendes Wachstum aus. Auch in den beiden Varianten mit der höchsten N-Düngung und mit hoher Al-Aktivität im Boden waren keine morphologischen Schäden an Fein- und Feinstwurzeln zu beobachten.Bezüglich der Ursachen der sog. Hochlagenerkrankung der Fichte auf sauren Böden wird aus den Versuchsergebnissen gefolgert, daß sowohl Al-Toxizität strictu sensu als auch kräftiger Zuwachsanstieg als Folge verbesserter N-Ernährung und daraus resultierender Mg-Mangel (Verdünnungseffekt) ausgeschlossen werden können. Entscheidender prädisponierender Faktor ist die natürliche Mg (Ca)-Armut des Substrats, die anthropogen sowohl durch die Effekte hoher Säureeinträge aus der Atmosphäre als auch durch große Nährstoffentzüge mit der Biomasseernte verschärft sein kann.Clonal Norway spruce seedlings were cultivated at 1300 and 1150 m a.s.l. in the Inner Bavarian Forest in large (40 L) containers filled with very acid subsoil material low in humus and highly saturated with aluminum, originating from a dystric cambisol derived from granite. They were fertilized for 4 years with 3 doses of NH4NO3 (N+, N++, N+++). The control treatment was a combination of NH4NO3 and MgSO4 (N+Mg+).Repeated fertilization with N alone decreased the exchangeable Mg concentrations and the Mg saturation of the soil as well as the Mg levels in needles and roots and induced typical symptoms of Mg deficiency, whereas the N+Mg+ treatment showed balanced nutrition. The biomass production of needles, shoot axes and root fractions, however, was not affected by the treatments. Obviously the lowest N dose (during the period of fertilization) was sufficient to support optimum growth under the harsh climatic conditions at high elevation. Even in the two treatments with very high application of N and considerable activity of Al in the soil no morphological damage to the fine and finest roots could be detected.With regard to the causes of the “Norway spruce disease on acid soils at high altitudes” these experimental results lead to the conclusion that Al toxicity in the strict sense can be ruled out. The same holds true for the growth acceleration under discussion as induced by improved N nutrition, along with Mg deficiency (dilution effect). The decisive predisposing factor of this disease type is the natural scarcity of Mg (Ca) in the referring soils, with may be aggravated by both the atmospheric input of acids and increased Mg export via biomass harvest.
Starting Page	114
Ending Page	127
Page Count	14
File Format	PDF
ISSN	00158003
Journal	Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number	119
Issue Number	1-6
e-ISSN	14390337
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	biomass production forest decline magnesium deficiency root damage soil acidification Forestry Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Forestry

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Substrate acidity, nutritional status and growth of young Norway spruce(Picea abies [L.] Karst.) trèes in subalpine regions of the Bavarian Forest (Bavaria, Germany) as influenced by repeated NH4NO3 application — results of a container experiment

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