黄土高原人工油松林枯枝落叶截留动态研究

A study on interception processes of artificial Chinese pine forest litter on the Loess Plateau

用定位观测的方法研究了人工油松林枯枝落叶的截流量及其截留的动态过程。结果表明 ,黄土高原人工油松林枯枝落叶的截流量年均为49.3mm ,截留率为12.5%。枯枝落叶截留的动态过程受大气降水和环境因子的影响较大 ,也与其自身湿润程度有关。在次降水过程中 ,其截留的过程是当降水开始时 ,截留量增加迅速 ;降水持续到一定时间后 ,截流量的增量变小 ,达到最大值后 ,截流量在此处上下增减。枯枝落叶截留的动态过程可用直线和正弦函数的组合描述 ,且该函数能揭示枯枝落叶截留的生物学特性和环境因素对其过程的影响。该模型在计算森林水文及其水土保持效应评价中有广泛的应用前景。

Interception amount and intercepting processes of artificial Chinese pine litter were studied by local measure methods.The results showed the interception amount of litter and its interception rate were 49.3mm and 12.5% respectively.The interception processes of litter were affected by rainfall and environmental factors and also related with litter dry conditions.Interception processes of litter increased quickly when rainfall began,the increasing of amount interception varied slightly when rainfall went on to a certain period of time,after rainfall reached the peak value,the interception amount fluctuated at this point.The interception processes can be described using combination of line and sin function and the sin function can deal with the effects of biology and environment on litter absorption processes.The model has extensive utilization in forest hydrology and soil and water conservation evaluation.