A study on the farmland heat distribution conditions of cold type wheat during milk-filling

Based on the observed data from farmland microclimate，the farm land heat distribution conditions and the causes are analysed．The results show that the latent heat fluxes of“Shaan229”are 17．35～67．4Ow／m² and 45+39～153．38w／m² higherthan those of“9430”and the turbulent heat fluxes of“Shaan 229” are 33．67～ 84．25W ／m² and 21．24～142+99W／m² lower than those of“9430”respectively at 0．2m to 2／3 plant height and at 2／3 plant height to plant top in row．The heat flux at soll surface in“shaan229”is 10．8O～13+24w／m² lower than that in“9430”．The difference of the farm land heat distribution conditions between two temperature type wheats is caused by the difference of the biological characteristics+This difference is the main cause bringing about cooler and wetter farm land ecological environmental of the cold type wheat.