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Quantifying Nitrous Oxide Emissions from Chinese Grasslands with a Process-based Model : Volume 7, Issue 2 (05/03/2010)

By Zhang, F.

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Book Id: WPLBN0004005432
Format Type: PDF Article :
File Size: Pages 32
Reproduction Date: 2015

Title: Quantifying Nitrous Oxide Emissions from Chinese Grasslands with a Process-based Model : Volume 7, Issue 2 (05/03/2010)  
Author: Zhang, F.
Volume: Vol. 7, Issue 2
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Li, C. B., Zhang, F., Qi, J., Li, F. M., & Li, C. S. (2010). Quantifying Nitrous Oxide Emissions from Chinese Grasslands with a Process-based Model : Volume 7, Issue 2 (05/03/2010). Retrieved from http://read.schoollibrary.com/


Description
Description: Key Laboratory of Arid and Grassland Agro-Ecology (MOE), Lanzhou University, Lanzhou, Gansu, 730000, China. As one of the largest land cover types, grassland can potentially play an important role in the ecosystem services of natural resources in China. Nitrous oxide (N2O) is a major greenhouse gas emitted from grasslands. Current N2O inventory at regional or national level in China relies on the emission factor method, and is based on limited measurements. To improve inventory accuracy and capture the spatial variability of the N2O emissions under the diverse climate, soil and management conditions across China, we adopted an approach that uses a process-based biogeochemical model, DeNitrification-DeComposition (DNDC) in this study, to map the N2O emissions from China's grasslands. The DNDC was linked to a GIS database of spatially distributed information of climate, soil, vegetation and management at county-level for all grasslands in China. Daily weather data from 2000–2007 based on the national network of 670 meteorological stations were utilized in the model simulations. The results were validated against observations from several grasslands in China and from other countries. The modelled results showed a clear geographic pattern of N2O emissions from China's grasslands. A high-emission strip was found that stretched from northeast to central China, along the eastern boundary of the temperate grassland region adjacent to the major agricultural regions. The grasslands in the western mountain regions, however, emitted much less N2O. The regional average of N2O emission rates was 0.23, 0.11 and 0.39 kg N ha−1y−1 for the temperate, montane and tropical/subtropical grasslands, respectively. The national N2O emission was 76.5 Gg N from the 337 million ha of grasslands in China. The modelled results were in good agreement with observations (R2=0.64 for 11 datasets), suggesting that the process-based model can be used to capture the spatial dynamics of N2O emissions as an effective alternative to statistical method currently used in China.

Summary
Quantifying nitrous oxide emissions from Chinese grasslands with a process-based model

Excerpt
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