利用波文比 -能量平衡法测定了太行山山前平原冬小麦农田生态系统辐射平衡各分量 ,并计算了波文比、农田蒸散。结果表明 ,土壤水分对波文比具有控制性效应 ,波文比与 0～ 6 0 cm土层土壤相对含水量呈线性负相关。农田生态系统的蒸散量随作物的生长发育而呈上升趋势 ,净辐射是控制农田蒸散的热力驱动因子。农田生态系统的净辐射、潜热通量和显热通量为典型的非线性过程 ,随时间序列具有自相似的变化趋势。 The components of the radiation balance of winter wheat farm ecosystem in the Taihang Mountains piedmont plain were measured by the method of Bowen ratio and energy balance, and the wave ratio and farmland evapotranspiration were calculated. The results show that the soil moisture has a controlling effect on the wave ratio, and the Bowen ratio has a negative linear correlation with the soil relative water content in the 0 ~ 600 cm soil layer. Evapotranspiration of farmland ecosystems shows an upward trend with crop growth and development. Net radiation is a heat-driven factor controlling farmland evapotranspiration. The net radiation, latent heat flux and sensible heat flux of farmland ecosystem are typical nonlinear processes, with the trend of self-similarity changing with time series.