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http://dx.doi.org/10.25673/37730
Titel: | Goethite-bound phosphorus in an acidic subsoil is not available to beech (Fagus sylvatica L.) |
Autor(en): | Klotzbücher, Anika Schunck, Florian Klotzbücher, Thimo Kaiser, Klaus Glaser, Bruno Spohn, Marie Widdig, Meike Mikutta, Robert |
Erscheinungsdatum: | 2020 |
Art: | Artikel |
Sprache: | Englisch |
Zusammenfassung: | In forests, where the supply of bioavailable phosphorus (P) from easily weatherable primary minerals is small, plants are thought to recycle P efficiently by uptake of P released from decomposing forest floor material. Yet a share of the P is leached into the subsoil, where it is strongly adsorbed onto the reactive surfaces of pedogenic Fe and Al oxides. This raises the question of whether P leached into subsoil is also recycled. To investigate the mobilization of P bound to hydrous Fe oxides, we conducted a mesocosm experiment in a greenhouse. Beech saplings were grown for 14 months in subsoil material (Bw horizon from the P-poor Lüss beech forest) with added goethite-P adsorption complexes, in either inorganic (orthophosphate) or organic (phytate) form. Four types of control mesocosms were run: soil only and soil mixed with either dissolved orthophosphate or dissolved phytate or goethite. At the end of the experiment, neither total P mass in trees nor P contents in leaves differed between the treatments. According to leaf nutrient contents, plant growth was strongly limited by P in all treatments. Yet total P mass in trees did not increase over the course of the experiment. Thus, despite its P demand, beech was not able to acquire P from goethite surfaces within two vegetation periods. Also P added in dissolved form to the soil before transplanting as well as native soil P were not available. This suggests that, once inorganic and organic P is bound to pedogenic metal oxides in mineral soil, it is not or hardly recycled, which can be an explanation for field data demonstrating quantitatively significant stocks of P in the subsoil of P-deficient forests. |
URI: | https://opendata.uni-halle.de//handle/1981185920/37973 http://dx.doi.org/10.25673/37730 |
Open-Access: | Open-Access-Publikation |
Nutzungslizenz: | (CC BY 4.0) Creative Commons Namensnennung 4.0 International |
Sponsor/Geldgeber: | Publikationsfond MLU |
Journal Titel: | Frontiers in forests and global change |
Verlag: | Frontiers Media |
Verlagsort: | Lausanne |
Band: | 3 |
Heft: | 94 |
Originalveröffentlichung: | 10.3389/ffgc.2020.00094 |
Enthalten in den Sammlungen: | Open Access Publikationen der MLU |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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ffgc-03-00094.pdf | 2.3 MB | Adobe PDF | Öffnen/Anzeigen |