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Effects of drought and N-fertilization on N cycling in two grassland soils

Changes in frequency and intensity of drought events are anticipated in many areas of the world. In pasture, drought effects on soil nitrogen (N) cycling are spatially and temporally heterogeneous due to N redistribution by grazers. We studied soil N cycling responses to simulated summer drought and... Full description

Journal Title: Oecologia 2013-03-01, Vol.171 (3), p.705-720
Main Author: Hartmann, Adrian A
Other Authors: Barnard, Romain L , Marhan, Sven , Niklaus, Pascal A
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Berlin/Heidelberg: Springer
ID: ISSN: 0029-8549
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recordid: cdi_hal_primary_oai_HAL_hal_02652033v1
title: Effects of drought and N-fertilization on N cycling in two grassland soils
format: Article
creator:
  • Hartmann, Adrian A
  • Barnard, Romain L
  • Marhan, Sven
  • Niklaus, Pascal A
subjects:
  • 570 Life sciences
  • 590 Animals (Zoology)
  • Acid soils
  • Agricultural soils
  • Agrology
  • Animals
  • Archaea - genetics
  • beverages
  • biology
  • Biomedical and Life Sciences
  • Cattle
  • Climate
  • Climate Change
  • Denitrification
  • Drought
  • Droughts
  • Ecology
  • Ecosystem
  • Environmental Sciences
  • Environmental Studies
  • Fertilizers
  • food
  • Forest soils
  • fungi
  • Genes, Bacterial
  • Grassland soils
  • Hydrology/Water Resources
  • Institute of Evolutionary Biology
  • Life Sciences
  • Nitrification
  • Nitrogen - metabolism
  • Nitrogen Cycle
  • Plant Sciences
  • Plants
  • Soil - chemistry
  • Soil Microbiology
  • Soil water
  • SPECIAL TOPIC: IN HONOR OF CHRISTIAN KÖRNER
  • Urine
  • Urine - chemistry
  • Vegetal Biology
ispartof: Oecologia, 2013-03-01, Vol.171 (3), p.705-720
description: Changes in frequency and intensity of drought events are anticipated in many areas of the world. In pasture, drought effects on soil nitrogen (N) cycling are spatially and temporally heterogeneous due to N redistribution by grazers. We studied soil N cycling responses to simulated summer drought and N deposition by grazers in a 3-year field experiment replicated in two grasslands differing in climate and management. Cattle urine and NH 4 NO 3 application increased soil NH 4 + and NO 3 - concentrations, and more so under drought due to reduced plant uptake and reduced nitrification and denitrification. Drought effects were, however, reflected to a minor extent only in potential nitrification, denitrifying enzyme activity (DEA), and the abundance of functional genes characteristic of nitrifying (bacterial and archaeal amoA) and denitrifying (narG, nirS, nirK, nosZ) micro-organisms. N 2 O emissions, however, were much reduced under drought, suggesting that this effect was driven by environmental limitations rather than by changes in the activity potential or the size of the respective microbial communities. Cattle urine stimulated nitrification and, to a lesser extent, also DEA, but more so in the absence of drought. In contrast, NH 4 NO 3 reduced the activity of nitrifiers and denitrifiers due to top-soil acidification. In summary, our data demonstrate that complex interactions between drought, mineral N availability, soil acidification, and plant nutrient uptake control soil N cycling and associated N 2 O emissions. These interactive effects differed between processes of the soil N cycle, suggesting that the spatial heterogeneity in pastures needs to be taken into account when predicting changes in N cycling and associated N 2 O emissions in a changing climate.
language: eng
source:
identifier: ISSN: 0029-8549
fulltext: no_fulltext
issn:
  • 0029-8549
  • 1432-1939
url: Link


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titleEffects of drought and N-fertilization on N cycling in two grassland soils
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descriptionChanges in frequency and intensity of drought events are anticipated in many areas of the world. In pasture, drought effects on soil nitrogen (N) cycling are spatially and temporally heterogeneous due to N redistribution by grazers. We studied soil N cycling responses to simulated summer drought and N deposition by grazers in a 3-year field experiment replicated in two grasslands differing in climate and management. Cattle urine and NH 4 NO 3 application increased soil NH 4 + and NO 3 - concentrations, and more so under drought due to reduced plant uptake and reduced nitrification and denitrification. Drought effects were, however, reflected to a minor extent only in potential nitrification, denitrifying enzyme activity (DEA), and the abundance of functional genes characteristic of nitrifying (bacterial and archaeal amoA) and denitrifying (narG, nirS, nirK, nosZ) micro-organisms. N 2 O emissions, however, were much reduced under drought, suggesting that this effect was driven by environmental limitations rather than by changes in the activity potential or the size of the respective microbial communities. Cattle urine stimulated nitrification and, to a lesser extent, also DEA, but more so in the absence of drought. In contrast, NH 4 NO 3 reduced the activity of nitrifiers and denitrifiers due to top-soil acidification. In summary, our data demonstrate that complex interactions between drought, mineral N availability, soil acidification, and plant nutrient uptake control soil N cycling and associated N 2 O emissions. These interactive effects differed between processes of the soil N cycle, suggesting that the spatial heterogeneity in pastures needs to be taken into account when predicting changes in N cycling and associated N 2 O emissions in a changing climate.
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subject570 Life sciences ; 590 Animals (Zoology) ; Acid soils ; Agricultural soils ; Agrology ; Animals ; Archaea - genetics ; beverages ; biology ; Biomedical and Life Sciences ; Cattle ; Climate ; Climate Change ; Denitrification ; Drought ; Droughts ; Ecology ; Ecosystem ; Environmental Sciences ; Environmental Studies ; Fertilizers ; food ; Forest soils ; fungi ; Genes, Bacterial ; Grassland soils ; Hydrology/Water Resources ; Institute of Evolutionary Biology ; Life Sciences ; Nitrification ; Nitrogen - metabolism ; Nitrogen Cycle ; Plant Sciences ; Plants ; Soil - chemistry ; Soil Microbiology ; Soil water ; SPECIAL TOPIC: IN HONOR OF CHRISTIAN KÖRNER ; Urine ; Urine - chemistry ; Vegetal Biology
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descriptionChanges in frequency and intensity of drought events are anticipated in many areas of the world. In pasture, drought effects on soil nitrogen (N) cycling are spatially and temporally heterogeneous due to N redistribution by grazers. We studied soil N cycling responses to simulated summer drought and N deposition by grazers in a 3-year field experiment replicated in two grasslands differing in climate and management. Cattle urine and NH 4 NO 3 application increased soil NH 4 + and NO 3 - concentrations, and more so under drought due to reduced plant uptake and reduced nitrification and denitrification. Drought effects were, however, reflected to a minor extent only in potential nitrification, denitrifying enzyme activity (DEA), and the abundance of functional genes characteristic of nitrifying (bacterial and archaeal amoA) and denitrifying (narG, nirS, nirK, nosZ) micro-organisms. N 2 O emissions, however, were much reduced under drought, suggesting that this effect was driven by environmental limitations rather than by changes in the activity potential or the size of the respective microbial communities. Cattle urine stimulated nitrification and, to a lesser extent, also DEA, but more so in the absence of drought. In contrast, NH 4 NO 3 reduced the activity of nitrifiers and denitrifiers due to top-soil acidification. In summary, our data demonstrate that complex interactions between drought, mineral N availability, soil acidification, and plant nutrient uptake control soil N cycling and associated N 2 O emissions. These interactive effects differed between processes of the soil N cycle, suggesting that the spatial heterogeneity in pastures needs to be taken into account when predicting changes in N cycling and associated N 2 O emissions in a changing climate.
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abstractChanges in frequency and intensity of drought events are anticipated in many areas of the world. In pasture, drought effects on soil nitrogen (N) cycling are spatially and temporally heterogeneous due to N redistribution by grazers. We studied soil N cycling responses to simulated summer drought and N deposition by grazers in a 3-year field experiment replicated in two grasslands differing in climate and management. Cattle urine and NH 4 NO 3 application increased soil NH 4 + and NO 3 - concentrations, and more so under drought due to reduced plant uptake and reduced nitrification and denitrification. Drought effects were, however, reflected to a minor extent only in potential nitrification, denitrifying enzyme activity (DEA), and the abundance of functional genes characteristic of nitrifying (bacterial and archaeal amoA) and denitrifying (narG, nirS, nirK, nosZ) micro-organisms. N 2 O emissions, however, were much reduced under drought, suggesting that this effect was driven by environmental limitations rather than by changes in the activity potential or the size of the respective microbial communities. Cattle urine stimulated nitrification and, to a lesser extent, also DEA, but more so in the absence of drought. In contrast, NH 4 NO 3 reduced the activity of nitrifiers and denitrifiers due to top-soil acidification. In summary, our data demonstrate that complex interactions between drought, mineral N availability, soil acidification, and plant nutrient uptake control soil N cycling and associated N 2 O emissions. These interactive effects differed between processes of the soil N cycle, suggesting that the spatial heterogeneity in pastures needs to be taken into account when predicting changes in N cycling and associated N 2 O emissions in a changing climate.
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