Author:
Barkle G. F.,Stenger R.,Sparling G. P.,Painter D. J.
Abstract
To investigate the microbial turnover of dairy farm effluent (DFE) irrigated
onto soils we applied two loading rates (standard DFE, high DFE) onto a silt
clay loam. Additionally, we investigated the microbial availability of the
soluble DFE fraction compared with that of a glucose plus ammonium solution.
The soil was incubated at 25˚C for up to 244 days. A water-amended
treatment was used as the control. Net carbon mineralisation in the standard
DFE treatment was finished within 13 days and amounted to 29.7 2.4% of
the carbon applied, whereas in the high DFE treatment it continued until the
end of the measurements (Day 50) and reached 48.4 0.5%. DFE application
at the standard rate had only a minor effect on soil microbial biomass, but
the high DFE application supported a higher microbial biomass over a longer
period. Nitrogen immobilisation persisted in the standard DFE treatment
throughout the experiment, while the high DFE treatment shifted to the net
mineralisation phase by Day 113. Approximately 60% of the amended C was
mineralised within 13 days in both the soluble DFE and glucose treatments,
indicating similar microbial availability. Microbial growth, however, occurred
only in the glucose treatment.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
15 articles.
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