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利用位于河南省济源市的华北低丘山地30年生栓皮栎—侧柏—刺槐人工混交林2009年主要生长季节(5～9月)湍流通量及空气结构参数等观测数据,确定迭代法为该下垫面条件下大孔径闪烁仪(LAS)测算显热通量的计算法,测算白天大气非稳定层结状况下的显热通量(HLAS)。并采用通量印痕模型,对LAS法通量源区内由2台涡度相关系统观测得到的显热通量进行订正,得到源区内总显热通量值(HfEC)。分析LAS法与涡度相关法的显热通量测算或测定值的相关性,结果表明:HLAS与HfEC的线性相关系数可达0.93。说明在分析通量印痕和通量源区的基础上,采用LAS法测算低丘山地人工混交林显热通量具有较好的可行性。
Using the observed data of turbulent flux and air structure parameters of 30-year-old Quercus variabilis-Platycladus orientalis-Robinia pseudoacacia plantation in North China hilly area in Jiyuan City of Henan Province in 2009, Under the condition of underlying surface, large aperture scintillator (LAS) was used to calculate the sensible heat flux, and the sensible heat flux (HLAS) under daytime unstable atmosphere stratification was calculated. In addition, the sensible heat flux observed by two vorticity correlation systems in the flux source area of LAS method was corrected by using the flux imprinting model, and the total heat flux (HfEC) in the source area was obtained. The correlation between sensible heat flux and measured value of LAS method and eddy covariance method was analyzed. The results showed that the linear correlation coefficient between HLAS and HfEC was 0.93. It shows that it is feasible to measure the sensible heat fluxes of mixed plantations in the hilly and hilly area by using LAS method on the basis of analyzing the source of flux impressions and fluxes.