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Heat units for describing carbon mineralization and predicting net nitrogen mineralization



Heat units for describing carbon mineralization and predicting net nitrogen mineralization



Soil Science Society of America journal 52(5): 1346-1350



Rate constants that describe C and N mineralization vary due to the changing complexity of the C compounds decomposed. Both economic and environmental concerns point to the importance of predicting net N mineralization from plant materials whose decomposition is initially characterized by net N immobilization. This study was conducted to examine the potential of the heat unit concept for describing C mineralization and for predicting the onset of net N mineralization from soil amended with an organic material. Rates of 0 and 59 g kg-1 papermill sludge were added to a soil and incubated ay 5, 10, 15, 20, 25, and 30 degrees C at constant water content in the laboratory. Carbon mineralization rates varied with temperature and apparent substrate complexity, but a nearly identical amount of C (4.7 to 5.3 g kg-1 soil) was mineralized before the beginning of net N mineralization. The cumulative heat input resulting in that amount of evolved C was within the same range (600 to 684 degree days) for the 10 to 25 degrees C treatments. The number of degree days accumulated until commencement of net N mineralization was also similar for these four temperature treatments. Field microplots were established with 0 and 59 g kg-1 papermill sludge amendment rates. Commencement of net N mineralization in the field occurred at approximately 649 degree days, a value in close agreement with laboratory study results. These data suggest the heat unit concept may be useful for collectively describing mineralization of C fractions with contrasting decomposability, it may allow prediction of the onset of net N mineralization, and it may also serve as a method lot linking laboratory and field studies of such biological processes as those studied here.

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Accession: 001850181

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DOI: 10.2136/sssaj1988.03615995005200050026x


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