冷型小麦灌浆期农田土壤热通量的分析

A study on soil heal flux of cold type wheat during filling stage

根据农田土壤温度资料 ,分析了冷型小麦陕 2 2 9和对照品种 9430的土壤温度 ,用热平衡台站规范方法计算了土壤热通量。结果表明 ,在灌浆期冷型小麦陕 2 2 9比 9430品种 0～ 0 .2 0 m土温偏低 0 .2～ 3.5℃ (8:0 0和 2 0 :0 0地面温度除外 ) ,偏低值以午后最大 ,地面达 2 .5～ 3.5℃ ,地下 0 .0 5 ,0 .10 ,0 .15和 0 .2 0 m分别达 1.5～2 .2 ,0 .9～ 1.6 ,0 .7～ 1.5和 0 .6～ 1.5℃。通过地面的土壤热通量陕 2 2 9比 9430偏低 10 .80～ 13.2 4J/ (m2· s) ,0～0 .2 0 m土层的热含量偏低 11.0 2～ 13.6 7J/ (m2· s) ,即冷型小麦的 0～ 0 .2 0

Based on the observed data,this paper analyses soil temperature in the field of cold type wheat Shaan 229 and ordinary type wheat 9430.The soil heat flux of Shaan 229 and 9430 are calculated with standard method of heat balances meteorological station.The results show that the soil temperature of Shaan 229 is 0.2-3.5 ℃ lower than that of 9430 during filling stage (with the exception of soil surface temperature at eight oclock and twenty oclock).The maximum difference in soil temperature at 0 m,0.05 m,0.10 m,0.15 m and 0.20 m are 2.5-3.5 ℃,1.5-2.2 ℃,0.9-1.6 ℃,0.7-1.5 ℃ and 0.6-1.5 ℃ at 14-15 oclock respectively.The heat flux of surface of Shaan 229 is 10.80-13.24 J/(m 2·s) lower than that of 9430.The soil heat energy of Shaan 229 between 0-0.20 m is 11.02-13.67 J/(m 2·s) lower than that of 9430.In other words,the soil environmental characteristics of the cold type wheat are cooler. This Characteristics are favorable to resist the dry hot weather during filling stage of wheat.