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Nutrient addition affects net and gross mineralization of phosphorus in the organic layer of a tropical montane forest

Titelangaben

Dietrich, Karla ; Spohn, Marie ; Villamagua, Miguel ; Oelmann, Yvonne:
Nutrient addition affects net and gross mineralization of phosphorus in the organic layer of a tropical montane forest.
In: Biogeochemistry. Bd. 136 (2017) Heft 2 . - S. 223-236.
ISSN 1573-515X
DOI: https://doi.org/10.1007/s10533-017-0392-z

Abstract

In tropical ecosystems with highly weathered soils, transformation of organic phosphorus (P) to bioavailable inorganic P plays a crucial role for the nutrition oforganisms. In these ecosystems, P is suspected to be growth-limiting and might therefore be affected by atmospheric nutrient depositions occurring even in remote areas, such as montane rainforests. We assessed effects of P and nitrogen (N) addition on net and gross P mineralization rates, and microbial P immobilization in the organic layer along an altitudinal gradient of a tropical montane rainforest in Ecuador.Net P mineralization rates amounted to 1.8 ± 0.9 (at 1000 m a.s.l.), 3.7 ± 0.6 (at 2000 m) and 2.0 ± 0.4 (at 3000 m) mg P kg-1 d-1. Altitudinal differences led to an increased microbial P immobilization at 1000 m, compensating for a higher gross Pmineralization. P addition increased net P mineralization rates at 2000 m and 3000 m,suggesting a higher P demand at 1000 m. At higher altitudes, P likely was released as a by-product during organic matter decomposition. Gross P mineralization, determined by means of the isotopic dilution approach, could not be calculated for control and N treatments due to rapid microbial P immobilization. For P (+N) treatments, gross Pmineralization rates were lowest at the 1000 m site towards the end of the long-term incubation period. Atmospheric P deposition in the tropics might lead to P fertilization effects through direct input as well as through acceleration of P release from organic matter, thereby increasing P availability for organisms.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER142956
Institutionen der Universität: Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 05 Jan 2018 09:52
Letzte Änderung: 17 Apr 2018 09:24
URI: https://eref.uni-bayreuth.de/id/eprint/41166