Effects of soil spatial resolution on quantifying CH4 and N2O emissions from rice fields in the Tai Lake region of China by DNDC model
Article first published online: 13 MAY 2011
Copyright 2011 by the American Geophysical Union.
Global Biogeochemical Cycles
Volume 25, Issue 2, June 2011
How to Cite
2011), Effects of soil spatial resolution on quantifying CH4 and N2O emissions from rice fields in the Tai Lake region of China by DNDC model, Global Biogeochem. Cycles, 25, GB2004, doi:10.1029/2010GB003825., , , , , and (
- Issue published online: 13 MAY 2011
- Article first published online: 13 MAY 2011
- Manuscript Accepted: 22 FEB 2011
- Manuscript Revised: 15 FEB 2011
- Manuscript Received: 12 MAR 2010
- effects of soil spatial resolution;
- green house gases;
- DNDC model
 Fourteen grid data sets of different cell resolutions were generated, from 0.5 × 0.5 km to 64 × 64 km, to estimate CH4 and N2O emissions from paddy soils in the Tai Lake region of China using the Denitrification-Decomposition (DNDC) model. The grids were derived from a polygon-based data set (1:50,000 digital soil map/database), which was the most detailed soil database for the region. Comparison of simulated CH4 and N2O concentrations from input of the 14 grid data sets with the original polygon data demonstrated (1) no distinct variability (relative errors <5%) of the results when grid data sets of cell size ≤2 km were used as input for the DNDC model; (2) slight variability (<10%) in the results when grid data sets with cell size in the range of 2 to 8 km were used as input; and (3) distinct variability (>10%) in the results when grid data sets with cell size of >8 km were applied as input. A grid data set with a cell size of 8 km was found to be optimal based on accuracy and computational efficiency of DNDC simulations. The results can be used as a guideline for optimizing field sampling strategies for locations where there is a lack of or insufficient soil data, whereby soil data can be collected through sampling in cell centers of designed grid frames.