基于Penman-Monteith模型的杨树日蒸腾模拟

研究半干旱地区林木的实际蒸腾量，对研究防护林密度调整、提高林木水分利用率及林分稳定有着重要的理论意义。忽略大气热层结问题，考虑气压订正，利用冠层整体气孔阻力rsT代替冠层阻力rst，将蒸散面净辐射限定于冠层截留净辐射Rnl，在林木气孔阻力等实测数据的基础上，应用修正后的Penman-Monteith模型和常规气象数据进行生长季林木蒸腾量的连续的模拟计算。结果表明，提出的参数处理方法符合蒸腾的变化规律，与典型实测结果对比，模拟的相对误差平均在5％以内，具有较好的实用价值。

Simulation of Daily Transpiration of Poplar Forest Based on Penman-Monteith Model

The research on the practical transpiration of forests in semiarid area has theoretical significance in handling the issues such as windbreak forest density adjustment, water use efficiency improvement and forest stability maintenance. By neglecting the problem of atmospheric thermal stratification, this paper considered the correction of air pressure, replaced the canopy layer stoma resistance rst with the canopy integral stoma resistance rsT , restricted the net radiation Rn to the canopy intercepted net radiation Rnl and simulated continuously transpiration of the forestry during growth stages using the revised Penman-Monteith model with the observed stoma resistance data. The results indicated that the proposed parameter treatment method conformed to the transpiration law. Compared with the typical measured data for the poplar forest, the average relative error of the simulation was less than 5%. The method proposed in this paper has a practical value of application.