English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. At the early stages of pedogenesis, the dynamics of phosphorus (P)in soils are controlled by microbial communities, the physicochemicalproperties of the soil and the environmental conditions. While variousmicroorganisms involved in carrying out biogeochemical processes have beenidentified, little is known about the actual contribution of microbialprocesses, such as organic P hydrolysis and microbial P turnover, to Pcycling. We thus focused on processes driven by microbes and how they affectthe size and cycling of organic and inorganic soil P pools along a soilchronosequence in the Chamser Kangri glacier forefield (Western Himalayas).The rapid retreat of the glacier allowed us to study the early stages ofsoil formation under a cold arid climate. Biological P transformations werestudied with the help of the isotopic composition of oxygen (O) in phosphate(δ18OP) coupled to sequential P fractionation performed onsoil samples (0–5 cm depth) from four sites of different age spanning 0 to100–150 years. The P bound to Ca, i.e., 1 M HCl-extractable P,still represented 95 % of the total P stock after approximately 100 years of soildevelopment. Its isotopic composition was similar to the parent material atthe most developed site. Primary phosphate minerals, possibly apatite,mostly comprised this pool. The δ18OP of the available Pand the NaOH-extractable inorganic P instead differed from that of theparent material, suggesting that these pools underwent biological turnover.The δ18OP of the available P was mostly controlled by themicrobial P, suggesting fast exchanges occurred between these two poolspossibly fostered by repeated freezing–thawing and drying–rewetting cycles.The release of P from organic P becomes increasingly important with soilage, constituting one-third of the P flux to available P at the oldest site.Accordingly, the lighter isotopic composition of the P bound to Fe and Aloxides at the oldest site indicated that this pool contained phosphatereleased by organic P mineralization. Compared to previous studies on earlypedogenesis under alpine or cold climate, our findings suggest a much slowerdecrease of the P-bearing primary minerals during the first 100 years ofsoil development under extreme conditions. However, they provide evidencethat, by driving short-term P dynamics, microbes play an important role incontrolling the redistribution of primary P into inorganic and organic soilP pools.

Phosphorus dynamics during early soil development in a cold desert: insights from oxygen isotopes in phosphate