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Temporal Trends of Phosphorus Cycling in a Tropical Montane Forest in Ecuador During 14 Years

Wilcke, Wolfgang ; Velescu, Andre ; Leimer, Sophia ; Bigalke, Moritz ; Boy, Jens ; Valarezo, Carlos (2019)
Temporal Trends of Phosphorus Cycling in a Tropical Montane Forest in Ecuador During 14 Years.
In: Journal of Geophysical Research: Biogeosciences, 124 (5)
doi: 10.1029/2018JG004942
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Increased bioavailability of P can have a negative impact on plant biodiversity. In an approximately 9-ha catchment under N + P-limited megadiverse tropical montane forest in Ecuador, we budgeted all major P fluxes and determined whether the P fluxes changed from 1999 to 2013. Furthermore, we assessed which external drivers (rainfall, total P and acid deposition) caused this potential change. Mean (±SD) annual P deposition (bulk+dry) was 240 ± 270 mg/m2, with the SD reflecting the interannual variation. The annual P flux to the soil via throughfall+stemflow+litterfall was 1,400 ± 170 mg/m2 of which 18 ± 9.2% was leached to below the organic layer. The mineral soil retained 80 ± 12% of the P leached from the organic layer. The mean annual P weathering rate was 79 ± 63 mg/m2. The sum of P fluxes was approximately 5 times larger above than below the mineral soil surface, illustrating that P was tightly cycled in the biological part of the forest. The mean annual canopy budget was negative (−120 ± 280 mg/m2); that is, P was leached from the canopy. Throughfall was the largest source of dissolved P. The P catchment budget (total deposition-streamflow) was positive (200 ± 270 mg/m2); that is, P was retained, mainly in the soil organic layer. From 1999 to 2013, P fluxes with throughfall, stemflow, and streamflow increased significantly. The strongest driver of the P budgets of the canopy and the catchment was total P deposition. Our results demonstrate that mainly biological processes retained deposited P in the vegetation and the organic layer enhancing the internal P cycle.

Typ des Eintrags: Artikel
Erschienen: 2019
Autor(en): Wilcke, Wolfgang ; Velescu, Andre ; Leimer, Sophia ; Bigalke, Moritz ; Boy, Jens ; Valarezo, Carlos
Art des Eintrags: Bibliographie
Titel: Temporal Trends of Phosphorus Cycling in a Tropical Montane Forest in Ecuador During 14 Years
Sprache: Englisch
Publikationsjahr: 2019
Verlag: Wiley
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Geophysical Research: Biogeosciences
Jahrgang/Volume einer Zeitschrift: 124
(Heft-)Nummer: 5
DOI: 10.1029/2018JG004942
Kurzbeschreibung (Abstract):

Increased bioavailability of P can have a negative impact on plant biodiversity. In an approximately 9-ha catchment under N + P-limited megadiverse tropical montane forest in Ecuador, we budgeted all major P fluxes and determined whether the P fluxes changed from 1999 to 2013. Furthermore, we assessed which external drivers (rainfall, total P and acid deposition) caused this potential change. Mean (±SD) annual P deposition (bulk+dry) was 240 ± 270 mg/m2, with the SD reflecting the interannual variation. The annual P flux to the soil via throughfall+stemflow+litterfall was 1,400 ± 170 mg/m2 of which 18 ± 9.2% was leached to below the organic layer. The mineral soil retained 80 ± 12% of the P leached from the organic layer. The mean annual P weathering rate was 79 ± 63 mg/m2. The sum of P fluxes was approximately 5 times larger above than below the mineral soil surface, illustrating that P was tightly cycled in the biological part of the forest. The mean annual canopy budget was negative (−120 ± 280 mg/m2); that is, P was leached from the canopy. Throughfall was the largest source of dissolved P. The P catchment budget (total deposition-streamflow) was positive (200 ± 270 mg/m2); that is, P was retained, mainly in the soil organic layer. From 1999 to 2013, P fluxes with throughfall, stemflow, and streamflow increased significantly. The strongest driver of the P budgets of the canopy and the catchment was total P deposition. Our results demonstrate that mainly biological processes retained deposited P in the vegetation and the organic layer enhancing the internal P cycle.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Bodenmineralogie und Bodenchemie
Hinterlegungsdatum: 08 Dez 2022 11:39
Letzte Änderung: 08 Dez 2022 11:39
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