| Autor: |
D. J. McKenney, W. I. Findlay, C.F. Drury |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Soil Biology and Biochemistry. 23:751-755 |
| ISSN: |
0038-0717 |
| DOI: |
10.1016/0038-0717(91)90145-a |
| Popis: |
The relationships between denitrification, soil microbial biomass and selected soil properties were investigated in 13 soils which varied in physical and chemical properties. It was hypothesized that estimates of biomass C may be directly related to the background (unamended) denitrification rates. Denitrification potential (with C and NO−3 amendments) was also compared to biomass C and the indigenous soil properties. The background and potential denitrification rates were measured in these soils during 75 h of anacrobiosis. Background denitrification was highly correlated with biomass C. organic C content and moisture content at field capacity (−33 kPa). Soil organic C was also highly correlated with microbial biomass C. Nitrate was not limiting for most soils as in all but two soils the residual NO−3 content following incubation exceeded 10mg N kg−1. Hence. NO−3 concentration was not strongly correlated with the background denitrification rate. The denitrification potential was 5 times greater than background denitrification. In our study, C was the factor limiting denitrification. Further, microbial biomass appeared to be a sensitive indicator of both soil C content and background denitrification. There was no significant relationship between any of the other soil chemical and physical properties measured and the denitrification potential. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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