贡嘎山冷杉林区苔藓层截持降水过程研究

对长江上游贡嘎山的冷杉林研究表明,苔藓层具有明显的拦截和调蓄降水的生态水文作用.苔藓层水文作用过程分解成降雨截留、非饱和下渗、饱和下渗、雨后水分消退4个阶段.根据实验数据应用水箱模型,确定出了典型场降雨过程中各作用阶段水文过程模型及参数.通过持水实验,确定了冷杉幼龄林、中龄林、成熟林和过熟林等不同演替阶段的天然持水量、有效持水量和最大持水量,在长江上游以冷杉为代表的暗针叶林苔藓层的天然持水量是其最大持水量的80%.

Hydrological process of bryophyte of Abies fabris forest in Gongga Mountain

The research of the hydrological process and characteristics of bryophyte in the forest of Abies fabris in the Gongga Mountain, which locates in the upper reaches of the Yangtze River, indicates that bryophyte has obvious eco\|hydrological functions,such as rainfall interception and rainfall regulation.The hydrological process of bryophyte can be divided into 4 different stages,namely processes of rainfall interception,unsaturated infiltration,staturated infiltration and water loss.Based on the experimental data and the tank model,the authors design the different hydrological process models and parameters for the typical rainfall events.By the capacity test of bryophyte,the authors determine the different water holding abilities of different succession ages.The available water holding reached to 80% of the largest water holding for bryophyte layers.