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Improved representa...
Improved representation of phosphorus exchange on soil mineral surfaces reduces estimates of phosphorus limitation in temperate forest ecosystems
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- Yu, Lin (author)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science,Max Planck Institute for Biogeochemistry
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- Caldararu, Silvia (author)
- Trinity College Dublin,Max Planck Institute for Biogeochemistry
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- Ahrens, Bernhard (author)
- Max Planck Institute for Biogeochemistry
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- Wutzler, Thomas (author)
- Max Planck Institute for Biogeochemistry
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- Schrumpf, Marion (author)
- Max Planck Institute for Biogeochemistry
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- Helfenstein, Julian (author)
- Agroscope,Wageningen University
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- Pistocchi, Chiara (author)
- Agricultural research for develompent (CIRAD) Centre de Recherche de Montpellier
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- Zaehle, Sönke (author)
- Max Planck Institute for Biogeochemistry
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(creator_code:org_t)
- 2023-01-06
- 2023
- English.
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In: Biogeosciences. - : Copernicus GmbH. - 1726-4170 .- 1726-4189. ; 20:1, s. 57-73
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Abstract
Subject headings
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- Phosphorus (P) availability affects the response of terrestrial ecosystems to environmental and climate change (e.g., elevated CO2), yet the magnitude of this effect remains uncertain. This uncertainty arises mainly from a lack of quantitative understanding of the soil biological and geochemical P cycling processes, particularly the P exchange with soil mineral surfaces, which is often described by a Langmuir sorption isotherm. We first conducted a literature review on P sorption experiments and terrestrial biosphere models (TBMs) using a Langmuir isotherm. We then developed a new algorithm to describe the inorganic P exchange between soil solution and soil matrix based on the double-surface Langmuir isotherm and extracted empirical equations to calculate the sorption capacity and Langmuir coefficient. We finally tested the conventional and new models of P sorption at five beech forest sites in Germany along a soil P stock gradient using the QUINCY (QUantifying Interactions between terrestrial Nutrient CYcles and the climate system) TBM. We found that the conventional (single-surface) Langmuir isotherm approach in most TBMs largely differed from P sorption experiments regarding the sorption capacities and Langmuir coefficients, and it simulated an overly low soil P-buffering capacity. Conversely, the double-surface Langmuir isotherm approach adequately reproduced the observed patterns of soil inorganic P pools. The better representation of inorganic P cycling using the double-surface Langmuir approach also improved simulated foliar N and P concentrations as well as the patterns of gross primary production and vegetation carbon across the soil P gradient. The novel model generally reduces the estimates of P limitation compared with the conventional model, particularly at the low-P site, as the model constraint of slow inorganic P exchange on plant productivity is reduced.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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