Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9456630 | Environmental Pollution | 2005 | 8 Pages |
Abstract
The emission of NO was parameterized using empirical relationships with landuse type, fertilization rate and soil temperature. Eight landuse types (including four arable lands) were considered. Fertilization rates were distinguished for different regions and crops. A typical summer period of July in 1999 was chosen for detailed calculations. The total NO emission in the July is 141.1 Gg N, with 73.7% from arable lands and 22.0% from grasslands. The highest emission intensity can be more than 40 ng N mâ2 sâ1 in the heavily fertilized North China Plain, and the average of the whole lands is 6.5 ng N mâ2 sâ1. The annual emission was roughly estimated to be 657 Gg N, about 11.7% of the global total (5600 Gg N, reported by IPCC in 2000), and about 12.5% of the anthropogenic origin in China. Our results were compared with some earlier findings, and uncertainties were discussed.
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Authors
Qin'geng Wang, Zhiwei Han, Yoshiro Higano,