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

Scientia Agricola

Elizabeth J. Avramides²  Matina Christou²  David L. Jones¹ 

[1] ,National Agricultural Research Foundation Soil Science Institute of Athens Athens,Greece

关键词: DOC;    DON;    microbial activity;    mineralization;    nitrate;    storage;    DOC;    DON;    atividade microbiana;    mineralização;    nitrato;    armazenamento;   

DOI  :  10.1590/S0103-90162009000100019

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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