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1 Online-Ressource (25 Seiten)
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Content:
Abstract: Phosphorus availability may shape plant–microorganism–soil interactions in forest ecosystems. Our aim was to quantify the interactions between soil P availability and P nutrition strategies of European beech (Fagus sylvatica) forests. We assumed that plants and microorganisms of P-rich forests carry over mineral-bound P into the biogeochemical P cycle (acquiring strategy). In contrast, P-poor ecosystems establish tight P cycles to sustain their P demand (recycling strategy). We tested if this conceptual model on supply-controlled P nutrition strategies was consistent with data from five European beech forest ecosystems with different parent materials (geosequence), covering a wide range of total soil P stocks (160–900 g P m−2; 〈1 m depth). We analyzed numerous soil chemical and biological properties. Especially P-rich beech ecosystems accumulated P in topsoil horizons in moderately labile forms. Forest floor turnover rates decreased with decreasing total P stocks (from 1/5 to 1/40 per year) while ratios between organic carbon and organic phosphorus (C:Porg) increased from 110 to 984 (A horizons). High proportions of fine-root biomass in forest floors seemed to favor tight P recycling. Phosphorus in fine-root biomass increased relative to microbial P with decreasing P stocks. Concomitantly, phosphodiesterase activity decreased, which might explain increasing proportions of diester-P remaining in the soil organic matter. With decreasing P supply indicator values for P acquisition decreased and those for recycling increased, implying adjustment of plant–microorganism–soil feedbacks to soil P availability. Intense recycling improves the P use efficiency of beech forests
Note:
Aus: source_journal_id: (ISSN) 1573-515X ### source_journal_page: 5-29 ### source_journal_place: Dordrecht [u.a.] ### source_journal_publisher: Springer Science + Business Media B.V. ### source_journal_title: Biogeochemistry ### source_journal_volume: 136 ### source_journal_year: 2017 ###
Language:
English
DOI:
10.1007/s10533-017-0375-0
URN:
urn:nbn:de:bsz:25-freidok-1747998
URL:
Volltext
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URL:
https://nbn-resolving.org/urn:nbn:de:bsz:25-freidok-1747998
URL:
https://d-nb.info/1224191374/34
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