A MODEL OF NITROUS-OXIDE EVOLUTION FROM SOIL DRIVEN BY RAINFALL EVENTS .1. MODEL STRUCTURE AND SENSITIVITY
A MODEL OF NITROUS-OXIDE EVOLUTION FROM SOIL DRIVEN BY RAINFALL EVENTS .1. MODEL STRUCTURE AND SENSITIVITY
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DOI：
10.1029/92jd00509
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发表时间：
1992-06-20
影响因子：
4.4
通讯作者：
FROLKING, TA
中科院分区：
文献类型：
--
作者：
LI, CS;FROLKING, S;FROLKING, TA
本文介绍了一个降雨事件驱动的，面向过程的模拟模式，DNDC，一氧化二氮（N2 O），二氧化碳（CO2）和二氮（N2）的演变从农业土壤。该模型包括三个子模型：热水力，分解，反硝化。基本的气候数据驱动该模型产生动态土壤温度和湿度分布以及有氧-厌氧条件的变化。其他输入数据包括土壤质地和生物化学特性以及农业实践。在降雨事件之间，有机质的分解和其他氧化反应（包括硝化）占主导地位，总有机碳，可溶性碳和硝酸盐的水平不断变化。在降雨过程中，反硝化作用占主导地位，并产生N2 O和N2。N2 O和N2的日排放量计算在每个降雨事件和累积排放量的气体确定包括硝化N2 O排放以及。敏感性分析表明，降雨模式强烈影响N2 O排放量从土壤中，但可溶性碳和硝酸盐可以限制因素N2 O的演变过程中反硝化。在一年的敏感性模拟中，温度、降水、有机碳、粘粒含量和pH的变化对反硝化速率和N2 O排放量有显著影响。DNDC对外部参数变化的响应与文献报道的现场和实验结果一致。
This paper describes a rain-event driven, process-oriented simulation model, DNDC, for the evolution of nitrous oxide (N2O), carbon dioxide (CO2), and dinitrogen (N2) from agricultural soils. The model consists of three submodels: thermal-hydraulic, decomposition, and denitrification. Basic climate data drive the model to produce dynamic soil temperature and moisture profiles and shifts of aerobic-anaerobic conditions. Additional input data include soil texture and biochemical properties as well as agricultural practices. Between rainfall events the decomposition of organic matter and other oxidation reactions (including nitrification) dominate, and the levels of total organic carbon, soluble carbon, and nitrate change continuously. During rainfall events, denitrification dominates and produces N2O and N2. Daily emissions of N2O and N2 are computed during each rainfall event and cumulative emissions of the gases are determined by including nitrification N2O emissions as well. Sensitivity analyses reveal that rainfall patterns strongly influence N2O emissions from soils but that soluble carbon and nitrate can be limiting factors for N2O evolution during denitrification. During a year sensitivity simulation, variations ia temperature, precipitation, organic C, clay content, and pH had significant effects on denitrification rates and N2O emissions. The responses of DNDC to changes of external parameters are consistent with field and experimental results reported in the literature.