退耕雷竹春季林冠截留特性研究

为了研究退耕雷竹林冠截留特性，于2012年春季对不同林分密度的退耕雷竹林进行水文观测。结果表明：2个林分密度的雷竹林外降雨与林内降雨、树干径流均具有极显著的开口向上的抛物线函数关系，与林冠截留具有开口向下的抛物线函数关系。分布均匀和郁闭度高(0.96)的1号样地（(15000±750)株/hm2）林冠截留率平均为51.19%，雷竹分布和郁闭度(0.85)较低的2号样地（(22500±750)株/hm2）平均为38.04%。2块样地林冠截留率的巨大差异，意味着退耕雷竹林冠截留具有很大的可塑性和改造潜力，可通过调整退耕雷竹林的结构、密度等经营措施来提高其生态水文效益，从而达到水土保持高效经营的最终目标。

The Canopy Interception Characteristic Study of Phyllostachys praecox cv. Prevernalis Forest Returnedfrom Farmland in Spring

In the spring of 2012,the author carried out hydrological observation in different densities ＇ Phyllostachys praecox cv.Prevernalis forests returned from farmland,to research its canopy interception characteristic.The results showed precipitation outside the two Phyllostachys praecox cv.Prevernalis forests had an upwards parabolic relationship with stemflow and throughfall,and had a downwards parabolic relation with canopy interception.The rate of canopy interception of No.1 sample plot （15000±750） bamboos/hm 2 ] with uniform distribution and high crown density（0.96） was 51.19%,and that was 38.04% in No.2 sample plot （22500 ± 750） bamboos/hm 2 ] with low evenness and crown density（0.85）.The large difference between their canopy interceptions meant the large plasticity and improvement potential in such as structure and density of Phyllostachys praecox cv.Prevernalis forest,to improve its ecological hydrology effect.