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Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils
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| Zeitschriftentitel: | Global Biogeochemical Cycles |
|---|---|
| Personen und Körperschaften: | , , |
| In: | Global Biogeochemical Cycles, 21, 2007, 4 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Koch, Oliver Tscherko, Dagmar Kandeler, Ellen Koch, Oliver Tscherko, Dagmar Kandeler, Ellen |
|---|---|
| author |
Koch, Oliver Tscherko, Dagmar Kandeler, Ellen |
| spellingShingle |
Koch, Oliver Tscherko, Dagmar Kandeler, Ellen Global Biogeochemical Cycles Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils Atmospheric Science General Environmental Science Environmental Chemistry Global and Planetary Change |
| author_sort |
koch, oliver |
| spelling |
Koch, Oliver Tscherko, Dagmar Kandeler, Ellen 0886-6236 1944-9224 American Geophysical Union (AGU) Atmospheric Science General Environmental Science Environmental Chemistry Global and Planetary Change http://dx.doi.org/10.1029/2007gb002983 <jats:p>Investigations focusing on the temperature sensitivity of microbial activity and nutrient turnover in soils improve our understanding of potential effects of global warming. This study investigates the temperature sensitivity of C mineralization, N mineralization, and potential enzyme activities involved in the C and N cycle (tyrosine amino‐peptidase, leucine amino‐peptidase, ß‐glucosidase, ß‐xylosidase, <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase). Four different study sites in the Austrian alpine zone were selected, and soils were sampled in three seasons (summer, autumn, and winter). A simple first‐order exponential equation was used to calculate constant <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values for the C and N mineralization over the investigated temperature range (0–30°C). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of the C mineralization (average 2.0) for all study sites were significantly higher than for the N mineralization (average 1.7). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of both activities were significantly negatively related to a soil organic matter quality index calculated by the ratios of respiration to the organic soil carbon and mineralized N to the total soil nitrogen. The chemical soil properties or microbial biomass did not affect the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of C and N mineralization. Moreover, the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values showed no distinct pattern according to sampling date, indicating that the substrate quality and other factors are more important. Using a flexible model function, the analysis of relative temperature sensitivity (<jats:italic>RTS</jats:italic>) showed that the temperature sensitivity of activities increased with decreasing temperature. The C and N mineralization and potential amino‐peptidase activities (tyrosine and leucine) showed an almost constant temperature dependence over 0–30°C. In contrast, ß‐glucosidase, ß‐xylosidase, and <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase showed a distinctive increase in temperature sensitivity with decreasing temperature. Low temperature at the winter sampling date caused a greater increase in the <jats:italic>RTS</jats:italic> of all microbial activities than for the autumn and summer sampling dates. Our results indicate (1) a disproportion of the <jats:italic>RTS</jats:italic> for potential enzyme activities of the C and N cycle and (2) a disproportion of the <jats:italic>RTS</jats:italic> for easily degradable C compounds (ß‐glucose, ß‐xylose) compared with the C mineralization of soil organic matter. Thus temperature may play an important role in regulating the decay of different soil organic matter fractions due to differences in the relative temperature sensitivities of enzyme activities.</jats:p> Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils Global Biogeochemical Cycles |
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10.1029/2007gb002983 |
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| title |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_unstemmed |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_full |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_fullStr |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_full_unstemmed |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_short |
Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_sort |
temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| topic |
Atmospheric Science General Environmental Science Environmental Chemistry Global and Planetary Change |
| url |
http://dx.doi.org/10.1029/2007gb002983 |
| publishDate |
2007 |
| physical |
|
| description |
<jats:p>Investigations focusing on the temperature sensitivity of microbial activity and nutrient turnover in soils improve our understanding of potential effects of global warming. This study investigates the temperature sensitivity of C mineralization, N mineralization, and potential enzyme activities involved in the C and N cycle (tyrosine amino‐peptidase, leucine amino‐peptidase, ß‐glucosidase, ß‐xylosidase, <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase). Four different study sites in the Austrian alpine zone were selected, and soils were sampled in three seasons (summer, autumn, and winter). A simple first‐order exponential equation was used to calculate constant <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values for the C and N mineralization over the investigated temperature range (0–30°C). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of the C mineralization (average 2.0) for all study sites were significantly higher than for the N mineralization (average 1.7). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of both activities were significantly negatively related to a soil organic matter quality index calculated by the ratios of respiration to the organic soil carbon and mineralized N to the total soil nitrogen. The chemical soil properties or microbial biomass did not affect the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of C and N mineralization. Moreover, the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values showed no distinct pattern according to sampling date, indicating that the substrate quality and other factors are more important. Using a flexible model function, the analysis of relative temperature sensitivity (<jats:italic>RTS</jats:italic>) showed that the temperature sensitivity of activities increased with decreasing temperature. The C and N mineralization and potential amino‐peptidase activities (tyrosine and leucine) showed an almost constant temperature dependence over 0–30°C. In contrast, ß‐glucosidase, ß‐xylosidase, and <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase showed a distinctive increase in temperature sensitivity with decreasing temperature. Low temperature at the winter sampling date caused a greater increase in the <jats:italic>RTS</jats:italic> of all microbial activities than for the autumn and summer sampling dates. Our results indicate (1) a disproportion of the <jats:italic>RTS</jats:italic> for potential enzyme activities of the C and N cycle and (2) a disproportion of the <jats:italic>RTS</jats:italic> for easily degradable C compounds (ß‐glucose, ß‐xylose) compared with the C mineralization of soil organic matter. Thus temperature may play an important role in regulating the decay of different soil organic matter fractions due to differences in the relative temperature sensitivities of enzyme activities.</jats:p> |
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| description | <jats:p>Investigations focusing on the temperature sensitivity of microbial activity and nutrient turnover in soils improve our understanding of potential effects of global warming. This study investigates the temperature sensitivity of C mineralization, N mineralization, and potential enzyme activities involved in the C and N cycle (tyrosine amino‐peptidase, leucine amino‐peptidase, ß‐glucosidase, ß‐xylosidase, <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase). Four different study sites in the Austrian alpine zone were selected, and soils were sampled in three seasons (summer, autumn, and winter). A simple first‐order exponential equation was used to calculate constant <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values for the C and N mineralization over the investigated temperature range (0–30°C). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of the C mineralization (average 2.0) for all study sites were significantly higher than for the N mineralization (average 1.7). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of both activities were significantly negatively related to a soil organic matter quality index calculated by the ratios of respiration to the organic soil carbon and mineralized N to the total soil nitrogen. The chemical soil properties or microbial biomass did not affect the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of C and N mineralization. Moreover, the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values showed no distinct pattern according to sampling date, indicating that the substrate quality and other factors are more important. Using a flexible model function, the analysis of relative temperature sensitivity (<jats:italic>RTS</jats:italic>) showed that the temperature sensitivity of activities increased with decreasing temperature. The C and N mineralization and potential amino‐peptidase activities (tyrosine and leucine) showed an almost constant temperature dependence over 0–30°C. In contrast, ß‐glucosidase, ß‐xylosidase, and <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase showed a distinctive increase in temperature sensitivity with decreasing temperature. Low temperature at the winter sampling date caused a greater increase in the <jats:italic>RTS</jats:italic> of all microbial activities than for the autumn and summer sampling dates. Our results indicate (1) a disproportion of the <jats:italic>RTS</jats:italic> for potential enzyme activities of the C and N cycle and (2) a disproportion of the <jats:italic>RTS</jats:italic> for easily degradable C compounds (ß‐glucose, ß‐xylose) compared with the C mineralization of soil organic matter. Thus temperature may play an important role in regulating the decay of different soil organic matter fractions due to differences in the relative temperature sensitivities of enzyme activities.</jats:p> |
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| imprint_str_mv | American Geophysical Union (AGU), 2007 |
| institution | DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1 |
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| spelling | Koch, Oliver Tscherko, Dagmar Kandeler, Ellen 0886-6236 1944-9224 American Geophysical Union (AGU) Atmospheric Science General Environmental Science Environmental Chemistry Global and Planetary Change http://dx.doi.org/10.1029/2007gb002983 <jats:p>Investigations focusing on the temperature sensitivity of microbial activity and nutrient turnover in soils improve our understanding of potential effects of global warming. This study investigates the temperature sensitivity of C mineralization, N mineralization, and potential enzyme activities involved in the C and N cycle (tyrosine amino‐peptidase, leucine amino‐peptidase, ß‐glucosidase, ß‐xylosidase, <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase). Four different study sites in the Austrian alpine zone were selected, and soils were sampled in three seasons (summer, autumn, and winter). A simple first‐order exponential equation was used to calculate constant <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values for the C and N mineralization over the investigated temperature range (0–30°C). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of the C mineralization (average 2.0) for all study sites were significantly higher than for the N mineralization (average 1.7). The <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of both activities were significantly negatively related to a soil organic matter quality index calculated by the ratios of respiration to the organic soil carbon and mineralized N to the total soil nitrogen. The chemical soil properties or microbial biomass did not affect the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values of C and N mineralization. Moreover, the <jats:italic>Q</jats:italic><jats:sub>10</jats:sub> values showed no distinct pattern according to sampling date, indicating that the substrate quality and other factors are more important. Using a flexible model function, the analysis of relative temperature sensitivity (<jats:italic>RTS</jats:italic>) showed that the temperature sensitivity of activities increased with decreasing temperature. The C and N mineralization and potential amino‐peptidase activities (tyrosine and leucine) showed an almost constant temperature dependence over 0–30°C. In contrast, ß‐glucosidase, ß‐xylosidase, and <jats:italic>N</jats:italic>‐acetyl‐ß‐glucosaminidase showed a distinctive increase in temperature sensitivity with decreasing temperature. Low temperature at the winter sampling date caused a greater increase in the <jats:italic>RTS</jats:italic> of all microbial activities than for the autumn and summer sampling dates. Our results indicate (1) a disproportion of the <jats:italic>RTS</jats:italic> for potential enzyme activities of the C and N cycle and (2) a disproportion of the <jats:italic>RTS</jats:italic> for easily degradable C compounds (ß‐glucose, ß‐xylose) compared with the C mineralization of soil organic matter. Thus temperature may play an important role in regulating the decay of different soil organic matter fractions due to differences in the relative temperature sensitivities of enzyme activities.</jats:p> Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils Global Biogeochemical Cycles |
| spellingShingle | Koch, Oliver, Tscherko, Dagmar, Kandeler, Ellen, Global Biogeochemical Cycles, Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils, Atmospheric Science, General Environmental Science, Environmental Chemistry, Global and Planetary Change |
| title | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_full | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_fullStr | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_full_unstemmed | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_short | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_sort | temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| title_unstemmed | Temperature sensitivity of microbial respiration, nitrogen mineralization, and potential soil enzyme activities in organic alpine soils |
| topic | Atmospheric Science, General Environmental Science, Environmental Chemistry, Global and Planetary Change |
| url | http://dx.doi.org/10.1029/2007gb002983 |