Assessing turnover of microbial biomass phosphorus: Combination of an isotopic dilution method with a mass balance model

Microbial biomass phosphorus (P) can play an important role in P cycling and availability to plants by acting as a source (remineralization) or sink (immobilization) of phosphate ions (iP). To assess the role of the microbial P pools, both the dynamics (i.e. the turnover) and the size of the microbi...

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Vydáno v:Soil biology & biochemistry Ročník 42; číslo 12; s. 2231 - 2240
Hlavní autoři: Achat, David L., Morel, Christian, Bakker, Mark R., Augusto, Laurent, Pellerin, Sylvain, Gallet-Budynek, Anne, Gonzalez, Maya
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier Ltd 01.12.2010
Elsevier
Témata:
Agricultural sciences
Agronomy. Soil science and plant productions
Biochemistry and biology
biogeochemical cycles
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
Forest ecosystem
forest soils
forest trees
France
Fundamental and applied biological sciences. Psychology
immobilization in soil
Isotopic dilution method
Life Sciences
Mass balance model
Microbial biomass
Microbiology
mineralization
nutrient availability
nutrient uptake
P availability
P cycling
phosphates
Phosphorus
Physics, chemistry, biochemistry and biology of agricultural and forest soils
plant nutrition
simulation models
soil microorganisms
soil organic matter
Soil science
Soil study
temperate forests
temporal variation
Turnover
France
P cycling
Isotopic dilution method
P availability
Forest ecosystem
Turnover
Phosphorus
Microbial biomass
Mass balance model
Forests
Forest zone
Available nutrient
Isotope dilution
Modeling
Ecosystem
Soil science
Material balance
PHOSPHORUS
MICROBIAL BIOMASS
MASS BALANCE MODEL
TURNOVER
P AVAILABILITY
FOREST ECOSYSTEM
ISOTOPIC DILUTION METHOD
P CYCLING
ISSN:0038-0717, 1879-3428
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Shrnutí:Microbial biomass phosphorus (P) can play an important role in P cycling and availability to plants by acting as a source (remineralization) or sink (immobilization) of phosphate ions (iP). To assess the role of the microbial P pools, both the dynamics (i.e. the turnover) and the size of the microbial P pools were studied in forest soils. Combining an isotopic dilution method with a modelling approach, we showed the existence of two pools of microbial P with different dynamics and therefore of different importance in soil P availability and cycling. In particular, we showed that the largest pool of microbial P (80%) had a fast turnover (nine days). Microbial P increased with an increase in soil organic matter and represented up to 53% of total P in contrasting forest soils. By combining these results with the turnover times of microbial P obtained in the modelling study, we evaluated that 8.5–17.3 kg P ha −1 of microbial P could turn over in a few days. This suggests that microbial biomass P is a potentially significant source of available iP, and that micro-organisms can play a major role in P cycling in the forest studied here. However, microbial biomass can also be in competition with the trees since most of the remineralized P could be immobilized again in the microbial turnover.
Bibliografie:http://dx.doi.org/10.1016/j.soilbio.2010.08.023
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0038-0717
1879-3428
DOI:10.1016/j.soilbio.2010.08.023