Details
| Original language | English |
|---|---|
| Pages (from-to) | 1370-1386 |
| Number of pages | 17 |
| Journal | Journal of Geophysical Research: Biogeosciences |
| Volume | 124 |
| Issue number | 5 |
| Publication status | Published - 30 May 2019 |
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/m 2, with the SD reflecting the interannual variation. The annual P flux to the soil via throughfall+stemflow+litterfall was 1,400 ± 170 mg/m 2 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/m 2. 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/m 2); 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/m 2); 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.
Keywords
- catchment budget, litterfall, phosphorus fluxes, temporal trends, weathering rates
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Agricultural and Biological Sciences(all)
- Forestry
- Agricultural and Biological Sciences(all)
- Soil Science
- Earth and Planetary Sciences(all)
- Atmospheric Science
- Earth and Planetary Sciences(all)
- Palaeontology
- Environmental Science(all)
- Ecology
- Environmental Science(all)
- Water Science and Technology
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In: Journal of Geophysical Research: Biogeosciences, Vol. 124, No. 5, 30.05.2019, p. 1370-1386.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Temporal Trends of Phosphorus Cycling in a Tropical Montane Forest in Ecuador During 14 Years
AU - Wilcke, Wolfgang
AU - Velescu, Andre
AU - Leimer, Sophia
AU - Bigalke, Moritz
AU - Boy, Jens
AU - Valarezo, Carlos
N1 - Funding information: We thank E. Beck, K. Müller? Hohenstein, M. Richter, and W. Zech for coinitiating the long?term study; K. Fleischbein, R. Goller, M. Meyer? Grünefeldt, M. Sequeira, H. Wullaert, S. Yasin, and numerous undergraduate students for data acquisition during parts of the observation period; W. Schädler for providing RFA data of rock macro element concentrations; the Ecuadorian Environmental Ministry for the research permits; and Naturaleza y Cultura Internacional (NCI) in Loja for providing the study area and the research station and the Deutsche Forschungsgemeinschaft (DFG) for funding (FOR402 and FOR816). The original data are included in the supporting information.
PY - 2019/5/30
Y1 - 2019/5/30
N2 - 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/m 2, with the SD reflecting the interannual variation. The annual P flux to the soil via throughfall+stemflow+litterfall was 1,400 ± 170 mg/m 2 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/m 2. 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/m 2); 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/m 2); 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.
AB - 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/m 2, with the SD reflecting the interannual variation. The annual P flux to the soil via throughfall+stemflow+litterfall was 1,400 ± 170 mg/m 2 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/m 2. 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/m 2); 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/m 2); 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.
KW - catchment budget
KW - litterfall
KW - phosphorus fluxes
KW - temporal trends
KW - weathering rates
UR - http://www.scopus.com/inward/record.url?scp=85066472148&partnerID=8YFLogxK
U2 - 10.1029/2018jg004942
DO - 10.1029/2018jg004942
M3 - Article
VL - 124
SP - 1370
EP - 1386
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
SN - 2169-8953
IS - 5
ER -