Impact of microbial activity on the leaching of soluble N forms in soil

The hydrological transport of low-molecular weight organic nitrogen (LMWON) compounds has received little attention in the literature, particularly relative to inorganic nitrogen (N), with less attention given to the decoupling of the carbon (C) and N cycles following rainfall events. We determined...

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Bibliographic Details
Published in:Biology and fertility of soils 2018, Vol.54 (1), p.21-25
Main Authors: Carswell, A. M., Hill, P. W., Jones, D. L., Blackwell, M. S. A., Johnes, P. J., Dixon, E. R., Chadwick, D. R.
Format: Article
Language:English
Subjects:
Agriculture
Amino acids
Bacterial leaching
Biological activity
Biomedical and Life Sciences
Biota
Carbon cycle
Cycles
Decoupling
Hydrology
Leaching
Life Sciences
Loam
Loam soils
Microbial activity
Molecular weight
Nitrogen
Nitrogen isotopes
Organic nitrogen
Rain
Rainfall
Short Communication
Simulated rainfall
Soil
Soil microorganisms
Soil profiles
Soil Science & Conservation
Soil surfaces
Soils
Transport
Urea
Vertical advection
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Summary:The hydrological transport of low-molecular weight organic nitrogen (LMWON) compounds has received little attention in the literature, particularly relative to inorganic nitrogen (N), with less attention given to the decoupling of the carbon (C) and N cycles following rainfall events. We determined the impacts of the soil biota on the transport of N compounds in a loam soil, using 15 N and 13 C to trace the vertical transport of 15 N 13 C-urea, 15 N 13 C-amino acids, 15 NO 3 , and 15 NH 4 through the soil profile, following simulated rainfall events. This research has demonstrated that biotic assimilation leads to rapid decoupling of the C and N cycles during leaching, with C transport limited to the soil surface (
ISSN:0178-2762
1432-0789
DOI:10.1007/s00374-017-1250-9