太行山石质山地石榴中幼龄林林地蒸散规律研究

利用波文比-能量平衡方法测定了太行山石质山地石榴林地蒸散量的日变化和月变化，并且计算出各物候期的蒸散量．结果表明，石榴在中午关闭气孔，以减少生理蒸腾．石榴林地蒸散量与净辐射呈显著线性相关，回归方程为Y=0．0029X-0．1449，相关系数R为0．9．石榴林地从萌芽期到落叶期的总蒸散量为424．08mm．其中，开花-果实成熟期林地蒸散量最大，占生长季节总蒸散量的64．59％．石榴林地每年需要补充灌溉两次，一次在萌芽期，一次在开花前期．

Evapotranspiration in Pumica granatum stand in Lower Taihang Mountain

Based on energy balance method, the daily and monthly variations of evapotranspiration are measured in Pumica granatum stand in Lower Taihang Mountain. The evapotranspiration in different phenophase is also calculated. The results indicated that Pumica granatum trees close their stoma to decrease physiological transpiration at noon when the radiation is very intense. In Pumica granatum stand, the evapotranspiration was highly linearly correlated with net radiation. The regression equation was Y =0.0029 X -0.1449, and regression coefficient can reach 0.9. The total evapotranspiration was 424.08 mm, 64.59% of which was consumed from flowering phase to fruit maturing phase. Two essential supplementary irrigation, one in germination phase and the another before flowering phase, should be implemented to ensure the healthy growth of Pumica granatum trees.