摘要
利用贡嘎山冷杉林1998年和1999年土壤CO2通量对生物地球化学循环模型Forest-DNDC进行校准和验证,通过调整温度和湿度对土壤根呼吸影响的计算公式和对模型参数的本土化,提高了模拟值与真实值之间的吻合程度,尤其是提高了冬季土壤CO2释放模拟的准确性。校准后使土壤CO2日释放量模拟结果的平均误差(e)和相对平均误差(e′)分别下降了3.81 kg/hm2和13.49%,绝对平均误差(M)和相对绝对平均误差(M′)也同时降低;模型效率的Nash-Sutcliffe系数(Me)和冷模拟(利用默认参数)相比,也由0.651提高到0.683。模型验证结果表明,冷杉林土壤CO2释放通量模拟值大体上能够与实际观测值的季节变化和日变化保持一致,在释放的量上也与实际观测值相当。
Calibration and validation for Forest-DNDC was carried out by the fluxes of soil CO2 emission determined in 1998 and 1999 from Abies fabri forest at Gongga Mountain. Simulated fluxes of soil CO2 emission calibrated by changing temperature and humidity in the formula fitted well with values by measurement, especially that in winter. The mean error and the mean relative error of calibrated simulation of soil CO2 emission decreased 3.81 kg/hm^2 and by 13.49% than that of cold simulation as well as the mean and relative mean absolute error. The Nash-Sutcliffe index of model efficiency increased from 0.651 to 0.683. Validation of the model demonstrated that simulated CO2 emission of daily and seasonal change was similar to measured one.
出处
《浙江林业科技》
北大核心
2009年第6期11-16,共6页
Journal of Zhejiang Forestry Science and Technology
基金
国家重点基础研究发展计划资助(2005CB422005)
