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A Process-based Model of N2O Emission from a Rice-Winter Wheat Rotation Agro-Ecosystem： Structure, Validation and Sensitivity

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In order to numerically simulate daily nitrous oxide （N2O） emission from a rice-winter wheat rotation cropping system, a process-based site model was developed （referred to as IAP-N-GAS） to track the movement and transformation of several forms of nitrogen in the agro-eeosystem, which is affected by climate, soil, crop growth and management practices. The simulation of daily N2O fluxes, along with key daily environmental variables, was validated with three-year observations conducted in East China. The validation demonstrated that the model simulated well daily solar radiation, soil temperature and moisture, and also captured the dynamics and magnitude of accumulated rice aboveground biomass and mineral nitrogen in the soil. The simulated daily N2O emissions over all three years investigated were generally in good agreement with field observations. Particularly well simulated were the peak N2O emissions induced by fertilizations, rainfall events or mid-season drainages. The model simulation also represented closely the inter-annuM variation in N2O emission. These validations imply that the model has the capability to capture the general characteristics of N2O emission from a typical rice-wheat rotation agro-ecosystem. Sensitivity analyses revealed that the simulated N2O emission is most sensitive to the fertilizer application rate and the soil organic matter content, but it is much less sensitive to variations in soil pH and texture, temperature, precipitation and crop residue incorporation rate under local conditions.

Nitrous oxide （N2O）, modeling, N cycling, rice-wheat rotation

周再兴、郑循华、谢宝华、韩圣慧、刘春岩

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The State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

一氧化二氮排放 农业生态系统 轮作系统 冬小麦 验证 基础 稻谷 灵敏度

Chinese Academy of SciencesChinese Academy of SciencesChinese Academy of Sciences国家自然科学基金国家自然科学基金European Union （NitroEurope IP 017841） and the Hel

KZCX2-YW- 204KSCX3-SW-440KZCX1-SW-014042501040331014

2010

大气科学进展(英文版)
中国科学院大气物理研究所

大气科学进展(英文版)

CSTPCDCSCDSCI
影响因子：0.741
ISSN：0256-1530
年,卷(期)：2010.(1)
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