CAJ | 학술논문

利用贡嘎山冷杉林1998年和1999年土壤CO_2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CO_2释放模拟的准确性.校准后使土壤CO_2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/hm~2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CO_2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.
이용공알산랭삼림1998년화1999년토양CO_2통량대생물지구화학순배모형Forest-DNDC진행교준화험증,통과조정온도화습도대토양근호흡영향적계산공식화대모형삼수적본토화,제고료모의치여진실치지간적문합정도,우기시제고료동계토양CO_2석방모의적준학성.교준후사토양CO_2일석방량모의결과적평균오차((-e))화상대평균오차((-e)')분별하강료3.81 kg/hm~2화13.49%,절대평균오차(M)화상대절대평균오차(M')야동시강저;모형효솔적Nash-Sutcliffe계수(Me)화랭모의(이용묵인삼수)상비,야유0.651제고도0.683.모형험증결과표명,랭삼림토양CO_2석방통량모의치대체상능구여실제관측치적계절변화화일변화보지일치,재석방적량상야여실제관측치상당.
Calibration and validation for Forest-DNDC was carried out by the fluxes of soil CO_2 emission determined in 1998 and 1999 from Abies fabri forest at Gongga Mountain. Simulated fluxes of soil CO_2 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 CO_2 emission decreased 3.81kg/hm~2 and by 13.49%. than that of cold simulation as well as the mean and relative mean absolute error. The Nash-Suteliffe index of model efficiency increased from 0.651 to 0.683. Validation of the model demonstrated that simulated CO_2 emission of daily and seasonal change was similar to measured one.