Carbon and N turnover in moist sandy soil following short exposure to a range of high soil temperature regimes
Identifieur interne : 003029 ( PascalFrancis/Corpus ); précédent : 003028; suivant : 003030Carbon and N turnover in moist sandy soil following short exposure to a range of high soil temperature regimes
Auteurs : J. Luxh I ; I. R. P. Fillery ; S. Recous ; L. S. JensenSource :
- Australian journal of soil research [ 0004-9573 ] ; 2008.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Laboratory experiments were undertaken to examine the effects of high soil temperatures on N biotransformations in sandy soils. Soils were incubated at 30°, 40°, 50°, and 60°C for 2 days, before all treatments were kept at 30°C for up to 41 days. Another laboratory experiment evaluated the effect of different cycles of exposure to 50° and 30°C, including frequency and duration of exposure to 50°C, to assess the sensitivity of N biotransformations to temporary increases in temperature in the high range. CO2-C production, soil microbial biomass-C, gross N mineralisation, gross N immobilisation, and potential gross nitrification were measured. Gross N mineralisation and CO2-C production increased with temperature (in the range 30°-50°C) and exhibited a Q10-relationship close to 2. Between 50° and 60°C, Q10 was closer to 2.8. The increase in gross N mineralisation and CO2-C production after exposure to 50° and 60°C is attributed to the decomposition of dead microbial biomass by the viable microbial population but this flush in activity was short-lived. Immobilisation rate was always low and remained unaffected by the temperature regime, probably because the growth of the microbial biomass was inhibited at the higher temperatures. This imbalance between gross N mineralisation and immobilisation resulted in rapid increases in mineral N in soil. Two 6-h cycles of 50°C interspersed with 30°C were equally as effective as a single 48-h exposure at stimulating CO2 production. Evidence of uncoupling CO2 production and gross N mineralisation was observed in one study where soil was incubated at 50°C, but this response was not universal. The nitrification process was totally suppressed by exposure to temperature higher than 40°C, probably due to thermal denaturation of enzymes. The relevance of findings to field conditions is discussed.
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Format Inist (serveur)
NO : | PASCAL 09-0081619 INIST |
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ET : | Carbon and N turnover in moist sandy soil following short exposure to a range of high soil temperature regimes |
AU : | LUXHØI (J.); FILLERY (I. R. P.); RECOUS (S.); JENSEN (L. S.) |
AF : | Faculty of Life Sciences, The University of Copenhagen/1871 Frederiksberg/Danemark (1 aut., 4 aut.); INRA, UMR614 FARE/51000 Reims/France (1 aut., 3 aut.); CSIRO, Plant Industry, Private Bag 5, PO Wembley/WA 6913/Australie (2 aut., 3 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Australian journal of soil research; ISSN 0004-9573; Coden ASORAB; Australie; Da. 2008; Vol. 46; No. 8; Pp. 710-718; Bibl. 1 p.1/4 |
LA : | Anglais |
EA : | Laboratory experiments were undertaken to examine the effects of high soil temperatures on N biotransformations in sandy soils. Soils were incubated at 30°, 40°, 50°, and 60°C for 2 days, before all treatments were kept at 30°C for up to 41 days. Another laboratory experiment evaluated the effect of different cycles of exposure to 50° and 30°C, including frequency and duration of exposure to 50°C, to assess the sensitivity of N biotransformations to temporary increases in temperature in the high range. CO2-C production, soil microbial biomass-C, gross N mineralisation, gross N immobilisation, and potential gross nitrification were measured. Gross N mineralisation and CO2-C production increased with temperature (in the range 30°-50°C) and exhibited a Q10-relationship close to 2. Between 50° and 60°C, Q10 was closer to 2.8. The increase in gross N mineralisation and CO2-C production after exposure to 50° and 60°C is attributed to the decomposition of dead microbial biomass by the viable microbial population but this flush in activity was short-lived. Immobilisation rate was always low and remained unaffected by the temperature regime, probably because the growth of the microbial biomass was inhibited at the higher temperatures. This imbalance between gross N mineralisation and immobilisation resulted in rapid increases in mineral N in soil. Two 6-h cycles of 50°C interspersed with 30°C were equally as effective as a single 48-h exposure at stimulating CO2 production. Evidence of uncoupling CO2 production and gross N mineralisation was observed in one study where soil was incubated at 50°C, but this response was not universal. The nitrification process was totally suppressed by exposure to temperature higher than 40°C, probably due to thermal denaturation of enzymes. The relevance of findings to field conditions is discussed. |
CC : | 001E01P03; 002A32B03A2; 226C03 |
FD : | Carbone; Turnover; Humidité sol; Exposition; Haute température; Température sol; Régime thermique; Science terre; Science du sol; Sol sableux; Texture |
FG : | Sol; Non métal; Elément groupe IVA; Propriété hydrique sol; Caractéristique sol; Propriété thermique; Condition thermique; Propriété physique; Environnement physique; Type de sol textural; Type de sol |
ED : | carbon; Turnover; soil moisture; exhibits; high temperature; Soil temperature; thermal regime; Earth science; Soil science; sandy soils; textures |
EG : | soils; Non metal; Group IVA element; Soil water properties; Property of soil; thermal properties; Thermal condition; physical properties; Physical environment |
SD : | Carbono; Turnover; Humedad suelo; Alta temperatura; Temperatura suelo; Ciencia tierra; Ciencia del suelo; Textura |
LO : | INIST-10723.354000184647770090 |
ID : | 09-0081619 |
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Pascal:09-0081619Le document en format XML
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<term>carbon</term>
<term>exhibits</term>
<term>high temperature</term>
<term>sandy soils</term>
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<front><div type="abstract" xml:lang="en">Laboratory experiments were undertaken to examine the effects of high soil temperatures on N biotransformations in sandy soils. Soils were incubated at 30°, 40°, 50°, and 60°C for 2 days, before all treatments were kept at 30°C for up to 41 days. Another laboratory experiment evaluated the effect of different cycles of exposure to 50° and 30°C, including frequency and duration of exposure to 50°C, to assess the sensitivity of N biotransformations to temporary increases in temperature in the high range. CO<sub>2</sub>
-C production, soil microbial biomass-C, gross N mineralisation, gross N immobilisation, and potential gross nitrification were measured. Gross N mineralisation and CO<sub>2</sub>
-C production increased with temperature (in the range 30°-50°C) and exhibited a Q<sub>10</sub>
-relationship close to 2. Between 50° and 60°C, Q<sub>10</sub>
was closer to 2.8. The increase in gross N mineralisation and CO<sub>2</sub>
-C production after exposure to 50° and 60°C is attributed to the decomposition of dead microbial biomass by the viable microbial population but this flush in activity was short-lived. Immobilisation rate was always low and remained unaffected by the temperature regime, probably because the growth of the microbial biomass was inhibited at the higher temperatures. This imbalance between gross N mineralisation and immobilisation resulted in rapid increases in mineral N in soil. Two 6-h cycles of 50°C interspersed with 30°C were equally as effective as a single 48-h exposure at stimulating CO<sub>2</sub>
production. Evidence of uncoupling CO<sub>2</sub>
production and gross N mineralisation was observed in one study where soil was incubated at 50°C, but this response was not universal. The nitrification process was totally suppressed by exposure to temperature higher than 40°C, probably due to thermal denaturation of enzymes. The relevance of findings to field conditions is discussed.</div>
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<s5>28</s5>
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<fC07 i1="01" i2="2" l="SPA"><s0>Suelo</s0>
<s2>NT</s2>
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<s5>33</s5>
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<s2>NC</s2>
<s5>33</s5>
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<fC07 i1="02" i2="X" l="SPA"><s0>No metal</s0>
<s2>NC</s2>
<s5>33</s5>
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<fC07 i1="03" i2="X" l="FRE"><s0>Elément groupe IVA</s0>
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<s5>34</s5>
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<s5>36</s5>
</fC07>
<fC07 i1="05" i2="X" l="SPA"><s0>Característica suelo</s0>
<s5>36</s5>
</fC07>
<fC07 i1="06" i2="2" l="FRE"><s0>Propriété thermique</s0>
<s5>37</s5>
</fC07>
<fC07 i1="06" i2="2" l="ENG"><s0>thermal properties</s0>
<s5>37</s5>
</fC07>
<fC07 i1="06" i2="2" l="SPA"><s0>Propiedad térmica</s0>
<s5>37</s5>
</fC07>
<fC07 i1="07" i2="X" l="FRE"><s0>Condition thermique</s0>
<s5>38</s5>
</fC07>
<fC07 i1="07" i2="X" l="ENG"><s0>Thermal condition</s0>
<s5>38</s5>
</fC07>
<fC07 i1="07" i2="X" l="SPA"><s0>Condición térmica</s0>
<s5>38</s5>
</fC07>
<fC07 i1="08" i2="2" l="FRE"><s0>Propriété physique</s0>
<s5>64</s5>
</fC07>
<fC07 i1="08" i2="2" l="ENG"><s0>physical properties</s0>
<s5>64</s5>
</fC07>
<fC07 i1="08" i2="2" l="SPA"><s0>Propiedad física</s0>
<s5>64</s5>
</fC07>
<fC07 i1="09" i2="X" l="FRE"><s0>Environnement physique</s0>
<s5>65</s5>
</fC07>
<fC07 i1="09" i2="X" l="ENG"><s0>Physical environment</s0>
<s5>65</s5>
</fC07>
<fC07 i1="09" i2="X" l="SPA"><s0>Medio ambiente físico</s0>
<s5>65</s5>
</fC07>
<fC07 i1="10" i2="2" l="FRE"><s0>Type de sol textural</s0>
<s4>INC</s4>
<s5>68</s5>
</fC07>
<fC07 i1="11" i2="2" l="FRE"><s0>Type de sol</s0>
<s4>INC</s4>
<s5>69</s5>
</fC07>
<fN21><s1>061</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
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<server><NO>PASCAL 09-0081619 INIST</NO>
<ET>Carbon and N turnover in moist sandy soil following short exposure to a range of high soil temperature regimes</ET>
<AU>LUXHØI (J.); FILLERY (I. R. P.); RECOUS (S.); JENSEN (L. S.)</AU>
<AF>Faculty of Life Sciences, The University of Copenhagen/1871 Frederiksberg/Danemark (1 aut., 4 aut.); INRA, UMR614 FARE/51000 Reims/France (1 aut., 3 aut.); CSIRO, Plant Industry, Private Bag 5, PO Wembley/WA 6913/Australie (2 aut., 3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Australian journal of soil research; ISSN 0004-9573; Coden ASORAB; Australie; Da. 2008; Vol. 46; No. 8; Pp. 710-718; Bibl. 1 p.1/4</SO>
<LA>Anglais</LA>
<EA>Laboratory experiments were undertaken to examine the effects of high soil temperatures on N biotransformations in sandy soils. Soils were incubated at 30°, 40°, 50°, and 60°C for 2 days, before all treatments were kept at 30°C for up to 41 days. Another laboratory experiment evaluated the effect of different cycles of exposure to 50° and 30°C, including frequency and duration of exposure to 50°C, to assess the sensitivity of N biotransformations to temporary increases in temperature in the high range. CO<sub>2</sub>
-C production, soil microbial biomass-C, gross N mineralisation, gross N immobilisation, and potential gross nitrification were measured. Gross N mineralisation and CO<sub>2</sub>
-C production increased with temperature (in the range 30°-50°C) and exhibited a Q<sub>10</sub>
-relationship close to 2. Between 50° and 60°C, Q<sub>10</sub>
was closer to 2.8. The increase in gross N mineralisation and CO<sub>2</sub>
-C production after exposure to 50° and 60°C is attributed to the decomposition of dead microbial biomass by the viable microbial population but this flush in activity was short-lived. Immobilisation rate was always low and remained unaffected by the temperature regime, probably because the growth of the microbial biomass was inhibited at the higher temperatures. This imbalance between gross N mineralisation and immobilisation resulted in rapid increases in mineral N in soil. Two 6-h cycles of 50°C interspersed with 30°C were equally as effective as a single 48-h exposure at stimulating CO<sub>2</sub>
production. Evidence of uncoupling CO<sub>2</sub>
production and gross N mineralisation was observed in one study where soil was incubated at 50°C, but this response was not universal. The nitrification process was totally suppressed by exposure to temperature higher than 40°C, probably due to thermal denaturation of enzymes. The relevance of findings to field conditions is discussed.</EA>
<CC>001E01P03; 002A32B03A2; 226C03</CC>
<FD>Carbone; Turnover; Humidité sol; Exposition; Haute température; Température sol; Régime thermique; Science terre; Science du sol; Sol sableux; Texture</FD>
<FG>Sol; Non métal; Elément groupe IVA; Propriété hydrique sol; Caractéristique sol; Propriété thermique; Condition thermique; Propriété physique; Environnement physique; Type de sol textural; Type de sol</FG>
<ED>carbon; Turnover; soil moisture; exhibits; high temperature; Soil temperature; thermal regime; Earth science; Soil science; sandy soils; textures</ED>
<EG>soils; Non metal; Group IVA element; Soil water properties; Property of soil; thermal properties; Thermal condition; physical properties; Physical environment</EG>
<SD>Carbono; Turnover; Humedad suelo; Alta temperatura; Temperatura suelo; Ciencia tierra; Ciencia del suelo; Textura</SD>
<LO>INIST-10723.354000184647770090</LO>
<ID>09-0081619</ID>
</server>
</inist>
</record>
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