植被大气间能量储存分项对能量闭合率的影响分析

植被大气间能量储存分项对能量闭合的影响在地表能量平衡研究中有重要意义。以张掖市盈科灌区玉米农田为研究区，在采用TDEC（Thermal Diffusion Equation+Correction）方法修正土壤热通量的基础上，分析了植被大气间能量储存分项对能量闭合率的影响。结果表明：能量储存分项对于能量闭合率具有一定的提升作用，平均提升幅度约为5.18%。能量储存分项对能量闭合率的影响与有效能量（R_n-G）相关。各能量储存分项对能量闭合率的贡献从大到小依次为：光合作用 >植被冠层热储存 >空气热储存 >空气湿度变化≈露水焓变，其中后两项量级极小，可在相关研究中忽略。量级较大的前三项能量分项具有明显的单峰日变化趋势，其中光合作用项相对另两分项在时间上有所滞后。此外，不同天气条件下（如有云和无云）能量储存分项对于能量闭合率的影响不同，有云时其影响相对较大。

Analyzing the effects of energy storage terms in vegetation-atmosphere system on energy balance closure

It is of great significance in the study of land surface energy balance to have a good comprehension of the effects on the EBC(Energy Balance Closure)of the energy storage terms,including photosynthesis storage, canopy heat storage,atmosphere heat storage,enthalpy change of air humidity and enthalpy change of dew,in vegetation-atmosphere system. In this paper,the influences of the energy storage terms on EBC were analyzed, using observation data obtained from a maize farmland in Zhangye Prefecture,Gansu Province,and using Ther-mal Diffusion Equation+Correction(TDEC)method to correct the calculation of soil heat flux. The following conclusions can be drawn:the energy storage terms have a positive effect on the energy balance closure with an increasing ratio of 5.18%on average. The influence of the energy storage terms on EBC is positively correlated with the magnitude of the available energy(net radiation Rn minus ground heat flux G). The contribution of the storage terms to EBC ranks as follows:photosynthesis storage > canopy heat storage > atmosphere heat stor-age>enthalpy change of air humidity≈enthalpy change of dew. Due to small magnitude,the latter two terms usually could be ignored in relevant studies. The other three terms show an clear daily change with single peak in their curves,and the peak of photosynthesis storage in day time is lag behind other two storages. In addition, comparing the relationships between EBC and the energy storage terms in different weather conditions,such as cloudy weather and cloudless weather,shows that the weather condition has a slightly impact on energy storage terms,and then on EBC.