DOI: 10.1029/2017JG004086
Scopus记录号: 2-s2.0-85049856903
论文题名: Following the Turnover of Soil Bioavailable Phosphate in Mediterranean Savanna by Oxygen Stable Isotopes
作者: Weiner T. ; Gross A. ; Moreno G. ; Migliavacca M. ; Schrumpf M. ; Reichstein M. ; Hilman B. ; Carrara A. ; Angert A.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1850
结束页码: 1862
语种: 英语
英文关键词: bioavailable phosphate
; Mediterranean savanna
; oxygen stable isotopes
; phosphate microbial turnover
; phosphorus
; soil P
Scopus关键词: bioavailability
; deciduous tree
; fertilizer
; microbial activity
; oxygen isotope
; phosphate
; phosphorus
; savanna
; soil nutrient
; stable isotope
; steady-state equilibrium
; tropical forest
; turnover
; Iberian Peninsula
; Mediterranean Region
英文摘要: 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113737
Appears in Collections: 气候减缓与适应
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作者单位: The Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Now at Department of Geography and Environmental Development, Ben Gurion University of the Negev, Beer Sheva, Israel; Forest Research Group, Universidad de Extremadura, Plasencia, Extremadura, Spain; Now at Biogeochemical Integration Department, Max Planck Institute for Biogeochemistry, Jena, Thuringia, Germany; Fundacion CEAM C/Charles Darwin, Paterna, Valencia, Spain
Recommended Citation:
Weiner T.,Gross A.,Moreno G.,et al. Following the Turnover of Soil Bioavailable Phosphate in Mediterranean Savanna by Oxygen Stable Isotopes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)