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FOR 536 P5: Quantification and biogeochemical modeling of C and N turnover processes and biosphere-atmosphere exchange of C and N compounds
Project
Project code: DFG FOR 536
Contract period: 01.01.2004
- 01.01.2016
Purpose of research: Basic research
Quantification and biogeochemical modelling of C and N turnover processes and biosphere-atmosphere exchange of C and N compounds
Biogeochemistry, C and N turnover processes in steppe ecosystems used for pasture
PD Dr. Klaus Butterbach-Bahl
Dr. Nicolas Brüggemann
PhD student Benjamin Wolf
Prof. Dr. Xunhua Zheng
Prof. Dr. Yao Huang
Prof. Dr. Yuesi Wang
Field measurements in MAGIM II will be restricted to obtain a full year dataset of N2O, CH4 and CO2 exchange for the sites ungrazed 1999 and winter-grazed. In addition manual flux measurements over an entire year will be performed at the new measuring site Stipa grandis (ungrazed 1979 and local grazing practice). Furthermore, manual measurements of N2O, CH4 and CO2 in nitrogen fertilization and irrigation experiments will be conducted to simulate the effects of a) management regime change (i.e. low dose nitrogen fertilization of grasslands), and b) inter-annual variation in precipitation. To obtain test sets of trace gas fluxes on a regional scale and to further identify grazing intensity effects on biosphere-atmosphere exchange soil cores will be taken across the landscape and at the grazing experiment of P3/P4 for detailed parameterization experiments (e.g. effect of moisture and temperature on Butterbach-Bahl, Brüggemann, Zheng, Wang & Huang 4 production/consumption/turnover rates of C and N compounds). To obtain a regional set of CO2/H2O fluxes for model testing ultralight flights with onboard EC measurements of CO2/H2O fluxes will be performed. The main focus of the project will be on the regionalization of biosphere-atmosphere exchange of C and N trace gases using the GIS coupled framework MOBILE with the embedded modules originating from DNDC and DayCENT. This will require further model development and intensive testing on site (site measurements) as well as on regional (regional soil sampling, ultralight aircraft experiment) scales. It also requires the integration of MOBILE in the MAGIM modelling framework, since other models within MAGIM, i.e. SWAT and CMF (regional hydrology models, P7), sward production model FOPROQ and sheep model (P3/ P4) and SAMT (GIS-coupled wind erosion model, P9), are delivering important driving and initialization parameters (e.g. SWAT regional soil moisture, or input parameters such as annual C/N erosion/deposition via wind and water erosion). The MAGIM integrated modeling approach will be used to test different scenarios of steppe management with regard to biosphere-atmosphere exchange and feedbacks on C and N stocks in soils.
Section overview
Subjects
- Soil science
Collaborative Project
Funding programme
Excutive institution
Institute for Meteorology and Climate Research Atmospheric Environmental Research (IMK-IFU)
