Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1029/1999JD900949
Titel (primär) A process-oriented model of N2O and NO emissions from forest soils: 1. Model development
Autor Li, C.S.; Aber, J.; Stange, F.; Butterbach-Bahl, K.; Papen, H.
Quelle Journal of Geophysical Research-Atmospheres
Erscheinungsjahr 2000
Department BOPHY
Band/Volume 105
Heft D4
Seite von 4369
Seite bis 4384
Sprache englisch
Keywords northeastern United States; nitrous oxide production; nitric oxide; Nitrosomonas europaea; nitrifying bacteria; agricultural soils; field measurements; generalized model; gaseous nitrogen; saturated soil
Abstract

To predict emissions of nitrous oxide (N2O) and nitric oxide (NO) from forest soils, we have developed a process-oriented model by integrating several new features with three existing models, PnET, Denitrification-Decomposition (DNDC), and a nitrification model. In the new model, two components were established to predict (1) the effects of ecological drivers (e.g., climate, soil, vegetation, and anthropogenic activity) on soil environmental factors (e.g., temperature, moisture, pH, redox potential, and substrates concentrations), and (2) effects of the soil environmental factors on the biochemical or geochemical reactions which govern NO and N2O production and consumption. The first component consists of three submodels for predicting soil climate, forest growth, and turnover of soil organic matter. The second component contains two submodels for nitrification and denitrification. A kinetic scheme, a so-called “anaerobic balloon,” was developed to calculate the anaerobic status of the soil and divide the soil into aerobic and anaerobic fractions. Nitrification is only allowed to occur in the aerobic fraction, while denitrification occurs only in the anaerobic fraction. The size of the anaerobic balloon is defined by the simulated oxygen partial pressure which is calculated based on oxygen diffusion and consumption rates in the soil. As the balloon swells or shrinks, the model dynamically allocates substrates (e.g., dissolved organic carbon, ammonium, nitrate, etc.) into the aerobic and anaerobic fractions. With this approach, the model is able to predict both nitrification and denitrification in the same soil at the same time. This feature is important for soils where aerobic and anaerobic microsites often exist simultaneously. With the kinetic framework as well as its interacting functions, the PnET-N-DNDC model links ecological drivers to trace gas emissions. Tests for validating the new model are published in a companion paper [Stange et al., this issue].

dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=7398
Li, C.S., Aber, J., Stange, F., Butterbach-Bahl, K., Papen, H. (2000):
A process-oriented model of N2O and NO emissions from forest soils: 1. Model development
J. Geophys. Res.-Atmos. 105 (D4), 4369 - 4384 10.1029/1999JD900949