Study on Properties of Heat Balance in Tree-tea Intercropping Plantation

A micro-meteorological observation/study in tree-tea intercropping plantation and pure tea plantation for comparison have been carried out in Huangshan City,Anhui Province.The soil heat flux,latent heat flux and turbulence heat flux have been calculated by gradient and heat balance methods.Generally speaking, component values of heat balance are positive in day time but negative at night,the date difference of these values from Chinese fir tea intercropping plantation are smaller than those from pure tea plantation and the appearance time of the maximum and minimum values in the former plantation are coming later.Among all component values of heat balance,the latent heat flux occupies the highest proportion from net radiation, which is around 1/3～1/2 or more,generally,turbulence heat flux is lower but it is possible to come higher occasionally in short time while soil heat flux occupies only 1/6 of net radiation. There is a rather obvious difference on daily dynamic properties of latent heat flux and turbulence heat flux between the two kinds of plantations mentioned above.