Affiliations: Institute of Geographic Sciences and Natural Resources
Research, Chinese Academy of Sciences, Beijing 100101, China; E-mail:
dongys@dls, iog. ac. cn | Max-Planck Institute of Chemistry, Division of
Atmospheric Chemistry, P. O. Box 3060, 55020 Mainz, Germany | Department of Geography, Mainz University, 55099
Mainz, Germany
Abstract: An enclosed chamber technique was used to measure N_2O emissions
from intensively agricultural soils of the North China Plain during the periods
of 1995-1996 and 1997-1998, to reflect distinct components of winter wheat and
summer maize growing seasons. The results showed that the continuous
application of fertilizer in agricultural soils increased N_2O emissions by a
factor of 24. 1-28.1, the calculated annual chemical N fertilizer-transformed
N_2O-N emissions was 0.67%. Our results indicated that the application of
organic manure also had a significant influence on soil N_2O emissions, which
combined with the use of chemical N increased about 20% in a year. It was
calculated that there were about 0.11% N of organic manure transformed as
N_2O-N. Annual mean N_2O emission from our study area of fertilized soils was
estimated to be 57.1 µgN_2O/(m² · h). A weak correlation was
also found between. N_2O emissions and soil available nitrogen content NH^+_4
.
Keywords: N_2O, emissions, the North China Plain, agricultural soils, chemical nitrogen, organic manure
