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Formation of soil phosphorus fractions along a climate and vegetation gradient in the Coastal Cordillera of Chile

Title data

Brucker, Emanuel ; Spohn, Marie:
Formation of soil phosphorus fractions along a climate and vegetation gradient in the Coastal Cordillera of Chile.
In: Catena. Vol. 180 (September 2019) . - pp. 203-211.
ISSN 0341-8162
DOI: https://doi.org/10.1016/j.catena.2019.04.022

Abstract in another language

Despite the importance of hosphorus (P) for ecosystems, the effect of climate and vegetation on the formation of P fractions is not well understood. Therefore, we explored the formation of soil P fractions along a climosequencecovering an arid, semi-arid, Mediterranean and humid site in the Coastal Cordillera of Chile. We determined Hedley P fractions (water extractable P, labile P, secondary mineral P, apatite P and residual P) as well as total organic P (TOP) in two soils on each of the four study sites. We calculated apatite dissolution rates based on the soil production rate and the soil P fractions, which has never been done before, according to our knowledge.Apatite P was the dominant P fraction in the soils at the arid and the semiarid site, and it decreased from the arid to the humid site by 96%. Residual P and secondary mineral P dominated at the humid site. The increase inplant available P along the climosequence went along with an increase in TOP. Apatite was strongly positively correlated with soil pH across all soils. The apatite dissolution rate increased with mean annual precipitationfrom 0 to 34mgPm⁠−2 yr⁠−1, leading to an increase in plant available P (sum of water extractable P and labile P) along the climosequence from the arid to the humid site. In conclusion, our study shows that the extent to which apatite in soil is dissolved, and the apatite dissolution rate strongly increase with precipitation, leading to anincrease in the concentrations of secondary soil P fractions (secondary mineral P, labile P and TOP) along the climosequence.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER151091
Keywords: Nutrients; Climate sequence; Apatite weathering; Biogenic weathering; Soil turnover time
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology > Chair Soil Ecology - Univ.-Prof. Dr. Eva Lehndorff
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Date Deposited: 24 Jan 2020 08:13
Last Modified: 24 Jan 2020 08:13
URI: https://eref.uni-bayreuth.de/id/eprint/53801