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| Titel |
A chronosequence approach to study stand age effects on total nitrogen as well as exchangeable K, Ca and Mg in the soils in view of increased energetic utilization of Quercus dominated forests in northeastern Austria |
| VerfasserIn |
Shuai Yan, Viktor J. Bruckman, Gerhard Glatzel, Eduard Hochbichler |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048436
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| Zusammenfassung |
| The recent IUFRO World Congress Seoul Resolution of August 2010 lists bio-energy as one
of the six key thematic areas of scientific research and international collaboration. In view
of growing interest in woody biomass as a source of renewable and sustainable
energy in northeastern Austria, a better understanding of soil properties is needed to
assess the capacity of the soils for sustainable forest productivity for this region.
This study focuses on exchangeable K, Ca and Mg pools of soils in order to learn
more on the temporal dynamics of plant nutrients as a basis for sustainable biomass
harvesting in Quercus dominated forests in northeastern Austria. We (i) quantified
nitrogen and the exchangeable cations K, Ca, Mg as well as CEC in the soils of
our study area, (ii) identified the effects of stand age on exchangeable cations and
(iii) estimated macronutrients pool of N, K, Ca, and Mg in aboveground biomass.
Three soil types (according to WRB: eutric cambisol, calcic chernozem and haplic
luvisol) were considered representative for the area and sampled. Nine permanent
Quercus petraea dominated plots were selected for our study. Soil pH, nitrogen and
exchangeable K, Ca and Mg, were determined in five geometric soil horizons. Aboveground
biomass was sampled by harvesting. In our study area, the nutrient pools in the
top 50 cm of the soil were (kg.ha-1): N 3640 – 7210, K 883 - 1510, Ca 1630 –
13630 and Mg 320 - 1850. The chronosequence approach was used to study how
stand age influences the pools of exchangeable cations in cambisols and luvisols of
Quercus dominated stands. Our study showed that the nutrient pools in the mineral soil
are sufficient to support the tree growth; stand age had no significant influence on
mineral nutrient levels in the soil. The levels of nutrients in particular exchangeable
cations in our study areas are reasonably high and do not indicate the necessity for
additional fertilization under current silvicultural practices and biomass extraction
rates.
Key words: Quercus; biomass; chronosequence approach; soil properties; exchangeable
cations |
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