Relieving substrate limitation-soil moisture and temperature determine gross N transformation rates
(2005) In Oikos 111(1). p.81-90- Abstract
- A field experiment was designed with the objective to reveal the interactions between soil moisture, temperature, total, dissolved, and phosphate buffer extractable C and N, and microbial activity in the control of in situ gross N mineralization and immobilization rates in a deciduous forest. We had three alternative hypotheses to explain variations of the gross N transformations: 1) microorganisms are C limited, 2) microorganisms are N limited, or 3) neither C nor N limit the microorganisms but moisture and temperature conditions. Each hypothesis had specific criteria to be fulfilled for its acceptance. The results demonstrated that gross N transformation rates were more dependent on and variable with soil moisture and temperature than... (More)
- A field experiment was designed with the objective to reveal the interactions between soil moisture, temperature, total, dissolved, and phosphate buffer extractable C and N, and microbial activity in the control of in situ gross N mineralization and immobilization rates in a deciduous forest. We had three alternative hypotheses to explain variations of the gross N transformations: 1) microorganisms are C limited, 2) microorganisms are N limited, or 3) neither C nor N limit the microorganisms but moisture and temperature conditions. Each hypothesis had specific criteria to be fulfilled for its acceptance. The results demonstrated that gross N transformation rates were more dependent on and variable with soil moisture and temperature than the size of the different C and N pools. The immobilization of N was dependent on the gross mineralization rate, suggesting that the production of enzymes for mineralization of organic N and the immobilization of N from the surrounding soil is disconfirmed when the intracellular N content of the microorganisms is sufficiently high. If the microorganisms are starved for N, enzyme systems involved in both the assimilation and mineralization of N are activated. The mean in situ gross N mineralization rate was two orders of magnitude higher than the natural N deposition in the area and the N addition in the NITREX experiments, meaning that a reduction in the gross N mineralization rate of about 1% would be enough to compensate for the addition of inorganic N. This decrease would hardly be detectable given the great spatial and temporal variability of N transformation rates. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/147050
- author
- Bengtson, Per LU ; Falkengren-Grerup, Ursula LU and Bengtsson, Göran LU
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Oikos
- volume
- 111
- issue
- 1
- pages
- 81 - 90
- publisher
- Wiley-Blackwell
- external identifiers
-
- wos:000231864900009
- scopus:26444603035
- ISSN
- 1600-0706
- DOI
- 10.1111/j.0030-1299.2005.13800.x
- language
- English
- LU publication?
- yes
- id
- 5a4f3b76-c23a-4b93-ba61-639313756b2e (old id 147050)
- date added to LUP
- 2016-04-01 11:54:01
- date last changed
- 2022-04-20 23:30:54
@article{5a4f3b76-c23a-4b93-ba61-639313756b2e,
abstract = {{A field experiment was designed with the objective to reveal the interactions between soil moisture, temperature, total, dissolved, and phosphate buffer extractable C and N, and microbial activity in the control of in situ gross N mineralization and immobilization rates in a deciduous forest. We had three alternative hypotheses to explain variations of the gross N transformations: 1) microorganisms are C limited, 2) microorganisms are N limited, or 3) neither C nor N limit the microorganisms but moisture and temperature conditions. Each hypothesis had specific criteria to be fulfilled for its acceptance. The results demonstrated that gross N transformation rates were more dependent on and variable with soil moisture and temperature than the size of the different C and N pools. The immobilization of N was dependent on the gross mineralization rate, suggesting that the production of enzymes for mineralization of organic N and the immobilization of N from the surrounding soil is disconfirmed when the intracellular N content of the microorganisms is sufficiently high. If the microorganisms are starved for N, enzyme systems involved in both the assimilation and mineralization of N are activated. The mean in situ gross N mineralization rate was two orders of magnitude higher than the natural N deposition in the area and the N addition in the NITREX experiments, meaning that a reduction in the gross N mineralization rate of about 1% would be enough to compensate for the addition of inorganic N. This decrease would hardly be detectable given the great spatial and temporal variability of N transformation rates.}},
author = {{Bengtson, Per and Falkengren-Grerup, Ursula and Bengtsson, Göran}},
issn = {{1600-0706}},
language = {{eng}},
number = {{1}},
pages = {{81--90}},
publisher = {{Wiley-Blackwell}},
series = {{Oikos}},
title = {{Relieving substrate limitation-soil moisture and temperature determine gross N transformation rates}},
url = {{http://dx.doi.org/10.1111/j.0030-1299.2005.13800.x}},
doi = {{10.1111/j.0030-1299.2005.13800.x}},
volume = {{111}},
year = {{2005}},
}