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Response of the fine root system in a Norway spruce stand to 13 years of reduced atmospheric nitrogen and acidity input

Title data

Zang, Ulrich ; Lamersdorf, Norbert ; Borken, Werner:
Response of the fine root system in a Norway spruce stand to 13 years of reduced atmospheric nitrogen and acidity input.
In: Plant and Soil. Vol. 339 (2011) Issue 1 . - pp. 435-445.
ISSN 1573-5036
DOI: https://doi.org/10.1007/s11104-010-0598-5

Abstract in another language

Atmospheric inputs of acids and nitrogen (N) have altered growth and vitality of forests for decades, but there is a lack of understanding concerning the response of these forests to reduced deposition. We studied fine root parameters of a Norway spruce stand treated with reduced input (clean rain) for 13 years. Fine roots of the clean rainplot had smaller N and Al contents, however, fine roots in the subsoil were still subjected to soil acidity and Al toxicity as indicated by a fine root Ca/Al ratio of less than 0.5. The treatment effect was most pronounced in the organic layer of the clean rain plot where fine root biomass increased by 66% and the live/dead ratio of fine roots increased by more than 100%. The elevated live/dead ratio was attributed to reduced mortality and faster decomposition of fine root litter. The latter was supported by a positive elationship between live/dead ratio and manganese content of fine roots. In contrast to the organic layer, fine root biomass was not different in the mineral soil. However, at 20–40 cm fine root diameter was greater and specific root tip density was smaller than in the topsoil likely because of strong N limitation as indicated by a C/N ratio of >50. Based on these morphological changes we postulate differing functional properties of fine roots in the organic layer and mineral soil below 20 cm depth. Further, our results suggest that Picea abies is able to adapt morphology and functional traits of its root system following reduced N availability.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER82724
Keywords: Solling roof project; Norway spruce; Atmospheric deposition; Fine roots; Re-establishment
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:32
Last Modified: 11 Sep 2015 06:32
URI: https://eref.uni-bayreuth.de/id/eprint/19076