English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Following the turnover of soil bioavailable phosphate in mediterranean savanna by oxygen stable isotopes

MPS-Authors
/persons/resource/persons62486

Migliavacca,  Mirco
Biosphere-Atmosphere Interactions and Experimentation, Dr. M. Migliavacca, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

/persons/resource/persons62545

Schrumpf,  Marion
Soil and Ecosystem Processes, Dr. M. Schrumpf, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;
Soil Processes, Dr. Marion Schrumpf, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

/persons/resource/persons62524

Reichstein,  Markus
Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

/persons/resource/persons228951

Hilman,  Boaz
Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;

External Ressource
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
Citation

Weiner, T., Gross, A., Moreno, G., Migliavacca, M., Schrumpf, M., Reichstein, M., et al. (2018). Following the turnover of soil bioavailable phosphate in mediterranean savanna by oxygen stable isotopes. Journal of Geophysical Research: Biogeosciences, 123(6), 1850-1862. doi:10.1029/2017JG004086.


Cite as: http://hdl.handle.net/21.11116/0000-0002-4658-D
Abstract
Soil phosphate oxygen isotope analysis (δ18OP) emerges as an effective method to trace the cycling of phosphorus (P) in soils. This study uses δ18OP measurements to learn how the nutrient status (P and N) affects the biological turnover rates of P in the soil of a Mediterranean holm oak Savanna. Such ecosystems cover >3 × 106 ha at the Iberian Peninsula. The analysis was part of a large-scale nutrient manipulation experiment, where N and P were added. We followed the changes in δ18O values of soil bioavailable P during incubation of soils with a pulse of P and in addition measured the δ18OP in soil sampled at the site. In the incubations, the δ18OP values changed from the original value of the added P and approached a steady state of 16.3‰, which is 3.8‰higher than the isotopic equilibrium with water. The steady state was higher with 18O-enriched incubation media water. The change in δ18OP values was more pronounced under trees, indicating a faster microbial P turnover rate. Incubation of soils fertilized with either P or N showed faster P turnover rate than control, implying N and P colimitation. Soil samples from P-fertilized plots displayed higher δ18OP than the fertilizer, rather than the expected decrease toward steady-state values, found at the control and N plots. The microbial P turnover rates during incubations were slower than the rates reported for lowland tropical forest with lower bioavailable P concentrations but resemble ecosystems with similar concentrations.