NDLI: Amino acid abundance and proteolytic potential in North American soils

Content Provider	Springer Nature Link
Author	Hofmockel, Kirsten S. Fierer, ah Colman, Benjamin P. Jackson, Robert B.
Copyright Year	2010
Abstract	Studies of nitrogen (N) cycling have traditionally focused on N mineralization as the primary process limiting plant assimilation of N. Recent evidence has shown that plants may assimilate amino acids (AAs) directly, circumventing the mineralization pathway. However, the general abundance of soil AAs and their relative importance in plant N uptake remains unclear in most ecosystems. We compared the concentrations and potential production rates of AAs and NH4 +, as well as the edaphic factors that influence AA dynamics, in 84 soils across the United States. Across all sites, NH4 + and AA-N comprised similar proportions of the total bioavailable N pool (~20%), with NO3 − being the dominant form of extractable N everywhere but in tundra and boreal forest soils. Potential rates of AA production were at least comparable to those of NH4 + production in all ecosystems, particularly in semi-arid grasslands, where AA production rates were six times greater than for NH4 + (P < 0.01). Potential rates of proteolytic enzyme activity were greatest in bacteria-dominated soils with low NH4 + concentrations, including many grassland soils. Based on research performed under standardized laboratory conditions, our continental-scale analyses suggest that soil AA and NH4 + concentrations are similar in most soils and that AAs may contribute to plant and microbial N demand in most ecosystems, particularly in ecosystems with N-poor soils.
Starting Page	1069
Ending Page	1078
Page Count	10
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	163
Issue Number	4
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil N cycle Proteolysis Ammonium Amino acid Organic N Nitrification Nitrogen mineralization Protein mineralization Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Ecosystem ecology- original paper amino acid abundance and proteolytic potential in north american soils.

ECOSYSTEM ECOLOGY- ORIGINAL PAPER Amino acid abundance and proteolytic potential in North American soils (2009)

Plant species identity and arbuscular mycorrhizal status modulate potential nitrification rates in nitrogen-limited grassland soils

A link between plant diversity, elevated CO2 and soil nitrate

Estimation of field soil nitrogen mineralization and nitrification rates using soil N transformation parameters obtained through laboratory incubation

Does ammonium-based N addition influence nitrification and acidification in humid subtropical soils of China?

Leaching of nitrogen from subtropical soils as affected by nitrification potential and base cations

Linking Carbon Saturation Concepts to Nitrogen Saturation and Retention

Soil denitrification fluxes from three northeastern North American forests across a range of nitrogen deposition

Amino acid abundance and proteolytic potential in North American soils

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Ecosystem ecology- original paper amino acid abundance and proteolytic potential in north american soils.

ECOSYSTEM ECOLOGY- ORIGINAL PAPER Amino acid abundance and proteolytic potential in North American soils (2009)

Plant species identity and arbuscular mycorrhizal status modulate potential nitrification rates in nitrogen-limited grassland soils

A link between plant diversity, elevated CO2 and soil nitrate

Estimation of field soil nitrogen mineralization and nitrification rates using soil N transformation parameters obtained through laboratory incubation

Does ammonium-based N addition influence nitrification and acidification in humid subtropical soils of China?

Leaching of nitrogen from subtropical soils as affected by nitrification potential and base cations

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Soil denitrification fluxes from three northeastern North American forests across a range of nitrogen deposition

Amino acid abundance and proteolytic potential in North American soils