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Stabilization of soil organic matter by earthworms is connected with physical protection rather than with chemical changes of organic matter

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F17%3A43895741" target="_blank" >RIV/60076658:12310/17:43895741 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/60077344:_____/17:00474994 RIV/00216208:11310/17:10359864

  • Výsledek na webu

    <a href="https://ac.els-cdn.com/S0016706116308163/1-s2.0-S0016706116308163-main.pdf?_tid=c3fd1326-f918-11e7-a3f5-00000aab0f6c&acdnat=1515927222_2eb57f3c216cf8928c58756821fc03e7" target="_blank" >https://ac.els-cdn.com/S0016706116308163/1-s2.0-S0016706116308163-main.pdf?_tid=c3fd1326-f918-11e7-a3f5-00000aab0f6c&acdnat=1515927222_2eb57f3c216cf8928c58756821fc03e7</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.geoderma.2016.11.017" target="_blank" >10.1016/j.geoderma.2016.11.017</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Stabilization of soil organic matter by earthworms is connected with physical protection rather than with chemical changes of organic matter

  • Popis výsledku v původním jazyce

    Earthworms are important drivers for the formation of soil structure and play a key role in soil organic matter (SOM) dynamics. Our previous long-term (126 weeks) laboratory experiment showed that carbon (C) loss declined through time in soil when litter was mixed and consumed by earthworms (Lumbricus rubellus). Eventually, the C loss was lower than in treatments where litter was mechanically mixed into soil with exclusion of earthworms. However, it is not clear if the solely physical manipulation of soil or biological activity of earthworms lead to different SOM quality, which would result in a distinction in C loss and consequently C sequestration. Thus, we differentiated between physical (mechanical mixing) and earthworm effects on SOM composition. Two types of soil were used in the experiment: clay and sand, and these were incubated with alder (Alnus glutinosa) and willow (Salix caprea) litter, respectively. The combination of soils and litter types corresponds to the natural combinations at the sampling sites. To explain underlying mechanisms of a lower C loss in the earthworm vs. mechanically mixed treatment, we separated SOM fractions in order to gain pools defined in the Rothamsted model. Chemical differences between initial litter and the active and slow pool of SOM obtained by fractionation were studied. No significant differences between the earthworm and mechanically mixed treatment were found in C, nitrogen (N), and phenol contents, composition of major chemical groups of litter studied by solid-state C-13 NMR spectroscopy, and composition of aromatic components of SOM studied by analytical pyrolysis (Py GC/MS). This lack of differences in chemical composition suggests that greater SOM sequestration in the earthworm treatment is likely to be connected with physical protection of SOM inside cast aggregates rather than with chemical changes in SOM mediated by earthworms.

  • Název v anglickém jazyce

    Stabilization of soil organic matter by earthworms is connected with physical protection rather than with chemical changes of organic matter

  • Popis výsledku anglicky

    Earthworms are important drivers for the formation of soil structure and play a key role in soil organic matter (SOM) dynamics. Our previous long-term (126 weeks) laboratory experiment showed that carbon (C) loss declined through time in soil when litter was mixed and consumed by earthworms (Lumbricus rubellus). Eventually, the C loss was lower than in treatments where litter was mechanically mixed into soil with exclusion of earthworms. However, it is not clear if the solely physical manipulation of soil or biological activity of earthworms lead to different SOM quality, which would result in a distinction in C loss and consequently C sequestration. Thus, we differentiated between physical (mechanical mixing) and earthworm effects on SOM composition. Two types of soil were used in the experiment: clay and sand, and these were incubated with alder (Alnus glutinosa) and willow (Salix caprea) litter, respectively. The combination of soils and litter types corresponds to the natural combinations at the sampling sites. To explain underlying mechanisms of a lower C loss in the earthworm vs. mechanically mixed treatment, we separated SOM fractions in order to gain pools defined in the Rothamsted model. Chemical differences between initial litter and the active and slow pool of SOM obtained by fractionation were studied. No significant differences between the earthworm and mechanically mixed treatment were found in C, nitrogen (N), and phenol contents, composition of major chemical groups of litter studied by solid-state C-13 NMR spectroscopy, and composition of aromatic components of SOM studied by analytical pyrolysis (Py GC/MS). This lack of differences in chemical composition suggests that greater SOM sequestration in the earthworm treatment is likely to be connected with physical protection of SOM inside cast aggregates rather than with chemical changes in SOM mediated by earthworms.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    40104 - Soil science

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/GAP504%2F12%2F1288" target="_blank" >GAP504/12/1288: Úloha funkčních vlastností listů rostlin při akumaulaci půdní organické hmoty během primární sukcese</a><br>

  • Návaznosti

    S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2017

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Geoderma

  • ISSN

    0016-7061

  • e-ISSN

  • Svazek periodika

    289

  • Číslo periodika v rámci svazku

    MAR 1 2017

  • Stát vydavatele periodika

    NL - Nizozemsko

  • Počet stran výsledku

    7

  • Strana od-do

    29-35

  • Kód UT WoS článku

    000392771300004

  • EID výsledku v databázi Scopus