<i>Comparing a Simple Carbon Nitrogen Model with Complex RZWQM Model</i>

2019 ◽  
Author(s):  
Anupam Bhar ◽  
Ratnesh Kumar ◽  
Robert W Malone
Keyword(s):  
Nitrogen Model

DRAINMOD-N, A NITROGEN MODEL FOR ARTIFICIALLY DRAINED SOIL

1997 ◽  
Vol 40 (4) ◽  
pp. 1067-1075 ◽  
Author(s):  
M. A. Brevé ◽  
R. W. Skaggs ◽  
J. E. Parsons ◽  
J. W. Gilliam
Keyword(s):  
Nitrogen Model

scholarly journals Development of a forest carbon and nitrogen model: Pilot application for a Pinus densiflora forest in Central Korea

2019 ◽  
Vol 15 (4) ◽  
pp. 202-209 ◽  
Author(s):  
Hyungsub Kim ◽  
Seongjun Kim ◽  
Jongyeol Lee ◽  
Hanna Chang ◽  
Yujin Roh ◽  
...  
Keyword(s):  
Pinus Densiflora ◽  
Forest Carbon ◽  
Carbon And Nitrogen ◽  
Nitrogen Model ◽  
Pinus Densiflora Forest

scholarly journals Adaptation of the Integrated Nitrogen Model for Catchments (INCA) to seasonally snow-covered catchments

2004 ◽  
Vol 8 (4) ◽  
pp. 695-705 ◽  
Author(s):  
K. Rankinen ◽  
Ø. Kaste ◽  
D. Butterfield
Keyword(s):  
Correction Factor ◽  
Snow Accumulation ◽  
Scale Model ◽  
Snow Pack ◽  
Climate Effect ◽  
N Transformation ◽  
Nitrogen Model ◽  
Degree Day ◽  
Wide Range ◽  
Soil Temperatures

Abstract. Testing of the Integrated Nitrogen model for Catchments (INCA) in a wide range of ecosystem types across Europe has shown that the model underestimates N transformation processes to a large extent in northern catchments of Finland and Norway in winter and spring. It is found, and generally assumed, that microbial activity in soils proceeds at low rates at northern latitudes during winter, even at sub-zero temperatures. The INCA model was modified to improve the simulation of N transformation rates in northern catchments, characterised by cold climates and extensive snow accumulation and insulation in winter, by introducing an empirical function to simulate soil temperatures below the seasonal snow pack, and a degree-day model to calculate the depth of the snow pack. The proposed snow-correction factor improved the simulation of soil temperatures at Finnish and Norwegian field sites in winter, although soil temperature was still underestimated during periods with a thin snow cover. Finally, a comparison between the modified INCA version (v.1.7) and the former version (v.1.6) was made at the Simojoki river basin in northern Finland and at Dalelva Brook in northern Norway. The new modules did not imply any significant changes in simulated NO3- concentration levels in the streams but improved the timing of simulated higher concentrations. The inclusion of a modified temperature response function and an empirical snow-correction factor improved the flexibility and applicability of the model for climate effect studies. Keywords: inorganic N leaching, degree-day snow model, snow pack, catchment scale model

scholarly journals WANDA, a regional dynamic nitrogen model (With Aggregated Nitrogen DynAmics) for nitrate leaching from forests

2004 ◽  
Vol 8 (4) ◽  
pp. 803-812 ◽  
Author(s):  
A. Tietema
Keyword(s):  
Nitrate Leaching ◽  
Regional Scale ◽  
C:N Ratio ◽  
Nitrogen Dynamics ◽  
Organic Layer ◽  
Water Fluxes ◽  
Forest Stands ◽  
Natural Ecosystems ◽  
Nitrogen Model ◽  
Nitrate Concentrations

Abstract. Nitrate concentrations in recently infiltrated groundwater in forested areas in the Netherlands are slowly increasing towards the EU limit of 50 mg NO3 l–1. The origin of this nitrate is thought to be leaching from nitrogen (N) saturated semi-natural ecosystems in these areas. To simulate nitrate leaching on a regional scale, the empirical model WANDA (a regional nitrogen model With Aggregated Nitrogen DynAmics) is introduced. The model is built around the concept that in forests the C:N ratio of the organic layer is indicative of the amount of nitrate leaving the system in drainage. WANDA was tested on a regional dataset of an infiltration area of 10 km2. This infiltration area consisted of 350 forest stands draining to the catchment "Edese Bos" used by a drinking water company. In 75 of the 350 forest stands the C:N ratio of the organic layer was measured. In 30 of these 75 stands, the nitrate concentrations below the rooting zone were measured. A hydrological model calculated water fluxes. The C:N ratio of the 75 stands ranged from 15.7 to 31.3 g C g–1 N. Scots pine stands had the highest C:N ratios in the organic layer. Nitrate concentrations varied in the 30 stands from 0.6 to 70 mg NO3 l–1. The nitrate concentrations in the Douglas fir stands were higher, and in the beech stands lower, than those observed in the locations with other tree species. WANDA predicted nitrate concentrations well, but improvements are required to simulate nitrate fluxes. The simulation of the water fluxes in WANDA is probably where more focussed modelling effort is now required. Keywords: nitrogen, nitrate, forest, model, WANDA, C:N ratio, organic layer

Multi-site identification of a distributed hydrological nitrogen model using Bayesian uncertainty analysis

2015 ◽  
Vol 529 ◽  
pp. 940-950 ◽  
Author(s):  
Sanyuan Jiang ◽  
Seifeddine Jomaa ◽  
Olaf Büttner ◽  
Günter Meon ◽  
Michael Rode
Keyword(s):  
Uncertainty Analysis ◽  
Nitrogen Model ◽  
Bayesian Uncertainty Analysis ◽  
Site Identification

Characterization of Surface Electrostatic Potentials of some (5,5) and (n,1) Carbon and Boron/Nitrogen Model Nanotubes

Nano Letters ◽  
2003 ◽  
Vol 3 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Zenaida Peralta-Inga ◽  
Pat Lane ◽  
Jane S. Murray ◽  
Sylke Boyd ◽  
M. Edward Grice ◽  
...  
Keyword(s):  
Electrostatic Potentials ◽  
Nitrogen Model ◽  
Surface Electrostatic Potentials ◽  
Boron Nitrogen

CABALA: a linked carbon, water and nitrogen model of forest growth for silvicultural decision support

2004 ◽  
Vol 193 (1-2) ◽  
pp. 251-282 ◽  
Author(s):  
Michael Battaglia ◽  
Peter Sands ◽  
Don White ◽  
Daryl Mummery
Keyword(s):  
Decision Support ◽  
Forest Growth ◽  
Nitrogen Model
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