Comparison of DAYCENT-simulated and measured nitrous oxide emissions from a corn field.
Comparison of DAYCENT-simulated and measured nitrous oxide emissions from a corn field.
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DAYCENT 模拟和测量的玉米田一氧化二氮排放量的比较。
DOI：
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发表时间：
2008
影响因子：
2.4
通讯作者：
Raymond J. Jones
中科院分区：
文献类型：
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作者：
M. Jarecki;T. Parkin;A. Chan;J. Hatfield;Raymond J. Jones
土壤中N（2）O排放的准确评估需要连续的全年和空间上广泛的监测或使用模拟，以气候，土壤和农业系统输入数据为基础，准确和精确地预测N（2）O通量。DAYCENT是一个生态系统模型，模拟土壤中的N（2）O排放等过程。本研究的目的是比较由DAYCENT模型预测的N（2）O通量与在爱荷华州中部的一个试验玉米田中测量的N（2）O通量。土壤含水量温度和无机氮，模拟DAYCENT与这些变量的实测值进行了比较。现场N（2）O排放量进行了测量，使用四个重复的自动化室在6小时的时间间隔，从一年（DOY）42通过DOY 254的2006年。我们观察到，DAYCENT一般准确地预测土壤温度，除了冬季时，预测的温度往往低于测量值。DAYCENT预测的体积含水量在实验期间的大部分时间普遍低于实测值。DAYCENT模拟的N2 O日排放量与实测通量显著相关，但时间序列分析表明模拟通量与实测通量存在异相。模拟计算的累积N（2）O排放量（3.29 kg N（2）O-N ha（-1））在实测累积N（2）O排放量（4.26 +/- 1.09 kg N（2）O-N ha（-1））的范围内。
Accurate assessment of N(2)O emission from soil requires continuous year-round and spatially extensive monitoring or the use of simulation that accurately and precisely predict N(2)O fluxes based on climatic, soil, and agricultural system input data. DAYCENT is an ecosystem model that simulates, among other processes, N(2)O emissions from soils. The purpose of the study was to compare N(2)O fluxes predicted by the DAYCENT model to measured N(2)O fluxes from an experimental corn field in central Iowa. Soil water content temperature and inorganic N, simulated by DAYCENT were compared to measured values of these variables. Field N(2)O emissions were measured using four replicated automated chambers at 6-h intervals, from day of year (DOY) 42 through DOY 254 of 2006. We observed that DAYCENT generally accurately predicted soil temperature, with the exception of winter when predicted temperatures tended to be lower than measured values. Volumetric water contents predicted by DAYCENT were generally lower than measured values during most of the experimental period. Daily N(2)O emissions simulated by DAYCENT were significantly correlated to field measured fluxes; however, time series analyses indicate that the simulated fluxes were out of phase with the measured fluxes. Cumulative N(2)O emission calculated from the simulations (3.29 kg N(2)O-N ha(-1)) was in range of the measured cumulative N(2)O emission (4.26 +/- 1.09 kg N(2)O-N ha(-1)).