Resilience of soil microbial activity and of amino acid dynamics to the removal of plant carbon inputs during winter

Many temperate agricultural soils have prolonged periods in the winter when plant carbon inputs to the soil are low. Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we sho...

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Veröffentlicht in:Scientia agricola 2009-01, Vol.66 (1), p.132-135
Hauptverfasser: Avramides, Elizabeth J.(National Agricultural Research Foundation Soil Science Institute of Athens), Christou, Matina(National Agricultural Research Foundation Soil Science Institute of Athens), Jones, David L.(Bangor University School of the Environment and Natural Resources Environment Centre Wales)
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container_title Scientia agricola
container_volume 66
creator Avramides, Elizabeth J.(National Agricultural Research Foundation Soil Science Institute of Athens)
Christou, Matina(National Agricultural Research Foundation Soil Science Institute of Athens)
Jones, David L.(Bangor University School of the Environment and Natural Resources Environment Centre Wales)
description Many temperate agricultural soils have prolonged periods in the winter when plant carbon inputs to the soil are low. Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we showed that the concentration of dissolved organic carbon and nitrogen in soil solution slowly declined alongside heterotrophic soil respiration. Measurements of free amino acid concentrations and turnover indicated that the amino acid pool in soil was rapidly depleted but readily replenished throughout the four-month period. This indicates that the soil contained intrinsic reserves of labile C that was capable of supporting the soil microbial community in times of reduced plant C inputs. Muitos solos agrícolas de regiões temperadas passam por períodos prolongados de inverno, nos quais a adição de carbono de plantas é muito reduzida. Foi utilizado um solo mantido à baixas temperaturas e na ausência de plantas para simular condições de uma cultura de uva durante o inverno. Em quatro meses de simulação mostrou-se que as concentrações de carbono orgânico e de nitrogênio dissolvidos na solução de solo declinaram lentamente em paralelo à respiração heterotrófica do solo. Medidas de concentração de renovação de amino ácidos livres indicaram que a reserva do solo em aminoácidos foi rapidamente esgotada, mas prontamente reabastecida durante o período de quatro meses. Isto indica que o solo possuía reservas intrínsecas de carbono lábil que foi capaz de sustentar a comunidade microbiana em tempos de adição reduzida de carbono de planta.
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Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we showed that the concentration of dissolved organic carbon and nitrogen in soil solution slowly declined alongside heterotrophic soil respiration. Measurements of free amino acid concentrations and turnover indicated that the amino acid pool in soil was rapidly depleted but readily replenished throughout the four-month period. This indicates that the soil contained intrinsic reserves of labile C that was capable of supporting the soil microbial community in times of reduced plant C inputs. Muitos solos agrícolas de regiões temperadas passam por períodos prolongados de inverno, nos quais a adição de carbono de plantas é muito reduzida. Foi utilizado um solo mantido à baixas temperaturas e na ausência de plantas para simular condições de uma cultura de uva durante o inverno. 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(Piracicaba, Braz.)</addtitle><date>2009-01-01</date><risdate>2009</risdate><volume>66</volume><issue>1</issue><spage>132</spage><epage>135</epage><pages>132-135</pages><issn>0103-9016</issn><issn>1678-992X</issn><eissn>1678-992X</eissn><eissn>0103-9016</eissn><abstract>Many temperate agricultural soils have prolonged periods in the winter when plant carbon inputs to the soil are low. Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we showed that the concentration of dissolved organic carbon and nitrogen in soil solution slowly declined alongside heterotrophic soil respiration. Measurements of free amino acid concentrations and turnover indicated that the amino acid pool in soil was rapidly depleted but readily replenished throughout the four-month period. 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subjects AGRICULTURE, MULTIDISCIPLINARY
armazenamento
atividade microbiana
DOC
DON
microbial activity
mineralization
mineralização
nitrate
nitrato
storage
title Resilience of soil microbial activity and of amino acid dynamics to the removal of plant carbon inputs during winter
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