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
Little of the solar energy reaching the earth actually results in soil warming The ener 'gy is used primarily to evaporate water from the soil or leaf surfaces, or is radiated or reflected back to sky Only about 10% is absorbed by the soil and can be used to warm soil
Little of the solar energy reaching the earth actually results in soil warming. The energy is used primarily to evaporate water from the soil or leaf surfaces, or is radiated or reflected back to sky. Only about 10% is absorbed by the soil and can be used to warm soil