对四川桤木和台湾桤木人工林枯落物持水特性研究

用浸水法对2个品种（四川桤木和台湾桤木）桤木人工林枯落物贮量，持水量，持水率和吸水速率进行了研究。结果表明：①四川桤木林下枯落物贮量（7.86t/hm^2）大于台湾桤木（7.35t/hm^2）；②四川桤木比台湾桤木不论在总持水量还是在各层持水量上都要大；③枯落物持水率在不同浸泡时间段内为四川桤木半分解层〉台湾桤木半分解层〉台湾桤木未分解层〉四川桤木未分解层；④2个桤木品种的2个分解层吸水速率与浸泡时间之间符合W=at-b；⑤四川桤木林下枯落物持水能力好于台湾桤木。

Water Holding Characteristics of Litter in Two Types of Alnus cremastogyne burk Plantation

The soaking method was used to research the litter storage, water content, water holdup and water absorption rate of two types（Alnus cremastogyne Burli and Alnus formosana ） of man-made alder forest. The result shows that the litter storage of Alnus cremas- togyne Burli is 7.86 t/hm^2 which is bigger than the Alnus formosana of 7.35t/hmz. Both the total water holding and the water holdup of the Alnus cremastogyne Burli are bigger than the Alnus formosana in each layer.The order of the water holdup of litter in different soak period is the semi-decomposed layer of the Alnus cremastogyne Burli 〉 the semi-decomposed layer of Alnus formosana〉 the non -decomposed layer of Alnus formosana〉 the non-decomposed layer of Alnus cremastogyne Burli.The water absorption rate in two decomposition level and series of alder of the two decomposed layer is accord with W=at-b. The water content of litter in Alnus cremastogyne Burli is better than that in Alnus formosana.