二、 The radiation balance and affect the factors in soil surface (-) The radiation balance in soil surface 太阳辐射 100 反射和散光 34 层吸收 达 地 47 流 射 23 地由 图6-3地面的热量平 〔北半球的年平均值,以2.03J′(cmn2min) 为100,根据1962年(ates的资料改绘〕二、The radiation balance and affect the factors in soil surface （一）The radiation balance in soil surface