Availability of soil phosphorus: In-situ monitoring using ion-exchange resins.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F20%3A00560163" target="_blank" >RIV/60077344:_____/20:00560163 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0333171" target="_blank" >https://hdl.handle.net/11104/0333171</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Availability of soil phosphorus: In-situ monitoring using ion-exchange resins.

Popis výsledku v původním jazyce

Understanding the controls over soil phosphorus (P) dynamics is crucial for identifying the possibility of ecosystem P limitation and, concurrently, for predicting risks of P losses and water eutrophication. To estimate the availability of soil P to soil biota, various extraction methods are used. Their principal disadvantage is the release of even stable and/or poorly defined soil P fractions leading to an overestimation of P availability. This imperfection is minimized using iron-based ion exchangers (IER) that continually remove phosphate from the soil solution. We tested the suitability of Fe-oxide nanoparticles based IER (Layne, USA) for measuring P availability in the field (Tahovská et al. 2016). Then, we used it to measure P dynamics in the soils of the two mountain catchments differing in their bedrocks (P-poor mica-schist., P-rich granite), and their P adsorbing abilities and exports to watercourses in ten consecutive years (Tahovská et al. 2018). Both catchments demonstrated substantial P retention (>95% of P inputs in deposition), with soil available P largely exceeding terrestrial P exports. Using ion-exchange resins, we observed higher soil P availability in the granitic catchment, which was positively related to terrestrial P export and negatively to soil P adsorbing ability. We determined the main factors affecting soil P availability dynamics in both catchments using quantitative data of long-term environmental and edaphic variables (GLMs with gamma distribution and log link function followed by a stepwise linear regression). Soil P availability was mainly controlled by the abiotic factors (throughfall chemistry, precipitation amount, litter C:P). Nevertheless, we assume that microbial processes can also drive high losses of P in the granitic catchment since the decomposition rate was the most influential variable of available P there. In conclusion, we advocate this method as a powerful predictor of P availability and P losses from various soils. It is particularly valuable in cases when site-specific conditions disqualify the use of lysimeters or estimation of terrestrial P exports using mass budget studies.

Název v anglickém jazyce

Availability of soil phosphorus: In-situ monitoring using ion-exchange resins.

Popis výsledku anglicky

Understanding the controls over soil phosphorus (P) dynamics is crucial for identifying the possibility of ecosystem P limitation and, concurrently, for predicting risks of P losses and water eutrophication. To estimate the availability of soil P to soil biota, various extraction methods are used. Their principal disadvantage is the release of even stable and/or poorly defined soil P fractions leading to an overestimation of P availability. This imperfection is minimized using iron-based ion exchangers (IER) that continually remove phosphate from the soil solution. We tested the suitability of Fe-oxide nanoparticles based IER (Layne, USA) for measuring P availability in the field (Tahovská et al. 2016). Then, we used it to measure P dynamics in the soils of the two mountain catchments differing in their bedrocks (P-poor mica-schist., P-rich granite), and their P adsorbing abilities and exports to watercourses in ten consecutive years (Tahovská et al. 2018). Both catchments demonstrated substantial P retention (>95% of P inputs in deposition), with soil available P largely exceeding terrestrial P exports. Using ion-exchange resins, we observed higher soil P availability in the granitic catchment, which was positively related to terrestrial P export and negatively to soil P adsorbing ability. We determined the main factors affecting soil P availability dynamics in both catchments using quantitative data of long-term environmental and edaphic variables (GLMs with gamma distribution and log link function followed by a stepwise linear regression). Soil P availability was mainly controlled by the abiotic factors (throughfall chemistry, precipitation amount, litter C:P). Nevertheless, we assume that microbial processes can also drive high losses of P in the granitic catchment since the decomposition rate was the most influential variable of available P there. In conclusion, we advocate this method as a powerful predictor of P availability and P losses from various soils. It is particularly valuable in cases when site-specific conditions disqualify the use of lysimeters or estimation of terrestrial P exports using mass budget studies.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

<a href="/cs/project/GA19-16605S" target="_blank" >GA19-16605S: Mezioborová studie cyklu prvků v horských jezerech a jejich lesních povodích zmlazujících se po odumření stromového patra</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů