Quantification of nitrate leaching from German forest ecosystems by use of a process oriented biogeochemical model

2011 ◽  
Vol 159 (11) ◽  
pp. 3204-3214 ◽  
Author(s):  
Ralf Kiese ◽  
Christoph Heinzeller ◽  
Christian Werner ◽  
Sandra Wochele ◽  
Rüdiger Grote ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
Forest Ecosystems ◽  
Biogeochemical Model ◽  
Process Oriented

Modeling nitrate leaching with a biogeochemical model modified based on observations in a row-crop field in Iowa

2006 ◽  
Vol 196 (1-2) ◽  
pp. 116-130 ◽  
Author(s):  
Changsheng Li ◽  
Neda Farahbakhshazad ◽  
Dan B. Jaynes ◽  
Dana L. Dinnes ◽  
William Salas ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
Biogeochemical Model ◽  
Row Crop ◽  
Crop Field

scholarly journals An improved process-oriented hydro-biogeochemical model for simulating dynamic fluxes of methane and nitrous oxide in alpine ecosystems with seasonally frozen soils

2021 ◽  
Vol 18 (13) ◽  
pp. 4211-4225
Author(s):  
Wei Zhang ◽  
Zhisheng Yao ◽  
Siqi Li ◽  
Xunhua Zheng ◽  
Han Zhang ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Management Practices ◽  
Biogeochemical Model ◽  
Field Observations ◽  
Alpine Ecosystems ◽  
Catchment Scale ◽  
Climate Zones ◽  
Process Oriented ◽  
Ch4 And N2o ◽  
Seasonally Frozen Regions

Abstract. The hydro-biogeochemical model Catchment Nutrient Management Model – DeNitrification-DeComposition (CNMM-DNDC) was established to simultaneously quantify ecosystem productivity and losses of nitrogen and carbon at the site or catchment scale. As a process-oriented model, this model is expected to be universally applied to different climate zones, soils, land uses and field management practices. This study is one of many efforts to fulfill such an expectation, which was performed to improve the CNMM-DNDC by incorporating a physically based soil thermal module to simulate the soil thermal regime in the presence of freeze–thaw cycles. The modified model was validated with simultaneous field observations in three typical alpine ecosystems (wetlands, meadows and forests) within a catchment located in seasonally frozen regions of the eastern Tibetan Plateau, including observations of soil profile temperature, topsoil moisture, and fluxes of methane (CH4) and nitrous oxide (N2O). The validation showed that the modified CNMM-DNDC was able to simulate the observed seasonal dynamics and magnitudes of the variables in the three typical alpine ecosystems, with index-of-agreement values of 0.91–1.00, 0.49–0.83, 0.57–0.88 and 0.26–0.47, respectively. Consistent with the emissions determined from the field observations, the simulated aggregate emissions of CH4 and N2O were highest for the wetland among three alpine ecosystems, which were dominated by the CH4 emissions. This study indicates the possibility for utilizing the process-oriented model CNMM-DNDC to predict hydro-biogeochemical processes, as well as related gas emissions, in seasonally frozen regions. As the original CNMM-DNDC was previously validated in some unfrozen regions, the modified CNMM-DNDC could be potentially applied to estimate the emissions of CH4 and N2O from various ecosystems under different climate zones at the site or catchment scale.

scholarly journals An improved process-oriented hydro-biogeochemical model for simulating dynamic fluxes of methane and nitrous oxide in alpine ecosystems with seasonally frozen soils

2021 ◽  
Author(s):  
Wei Zhang ◽  
Zhisheng Yao ◽  
Siqi Li ◽  
Xunhua Zheng ◽  
Han Zhang ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Management Practices ◽  
Biogeochemical Model ◽  
Field Observations ◽  
Wetland Degradation ◽  
Alpine Ecosystems ◽  
Catchment Scale ◽  
Field Management ◽  
Process Oriented ◽  
Ch4 And N2o

Abstract. To evaluate the sustainability of terrestrial ecosystems, the hydro-biogeochemical model Catchment Nutrient Management Model – DeNitrification-DeComposition (CNMM-DNDC) was established to simultaneously quantify ecosystem productivity and losses of nitrogen and carbon at the site or catchment scale. As a process-oriented model, this model is expected to be universally applied to different climate zones, soils, land uses and field management practices. This study, as one of many efforts to fulfil such an expectation, was performed to improve the CNMM-DNDC by incorporating a physical-based soil thermal module to simulate the soil thermal regime in the presence of freeze-thaw cycles. The modified model was validated with simultaneous field observations in three typical alpine ecosystems (wetlands, meadows and forests) within a catchment located in the seasonally frozen region of the eastern Tibetan Plateau. Then, the model was further applied to evaluate its performance in simulating the effects of alpine wetland degradation on methane (CH4) and nitrous oxide (N2O) fluxes. The validation showed that the modified CNMM-DNDC was able to simulate the observed seasonal dynamics of soil temperature, moisture, and fluxes of CH4 and N2O in the three typical alpine ecosystems, with index of agreement values of 0.91–1.00, 0.49–0.83, 0.57–0.88 and 0.26–0.47, respectively. Consistent with the emissions determined from the field observations, the simulated aggregate emissions of CH4 and N2O were significantly reduced due to wetland degradation and were dominated by a reduction in CH4 emissions. This study indicates the potential for utilizing the process-oriented model CNMM-DNDC to predict hydro-biogeochemical processes, as well as related gas emissions, in seasonally frozen regions. As the original CNMM-DNDC was previously validated in some unfrozen regions, the modified CNMM-DNDC could be applied to evaluate the sustainability of various ecosystems under different climates, soils and field management practices at the site or catchment scale.

Nitrate leaching in forest ecosystems is related to forest floor CN ratios

1998 ◽  
Vol 102 (1) ◽  
pp. 403-407 ◽  
Author(s):  
P. Gundersen ◽  
I. Callesen ◽  
W. de Vries
Keyword(s):  
Nitrate Leaching ◽  
Forest Floor ◽  
Forest Ecosystems
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