长白山二道白河森林流域溪流倒木调查研究

溪流倒木是森林生态系统对水生态系统最重要、最直观的输入和干扰之一，也是两系统之间的主要联结，对于溪流生态系统的稳定、水生生物多样性、河槽形态及其变化过程有着重要的作用。重点对长白山北坡溪流倒木现存量进行了调查和研究，在调查的红松阔叶林植被带内４５００ｍ长河道内，共发现溪流倒木４２５株．分属于１７个树种；其中ｌ、ｗ级腐烂占相当大的比重，与林地倒木Ｉ、ｌ级腐烂占忧有所不同，其原因可能与分解环境的不同有关。所有溪流倒木的总材积为７７．９８ｍ＾２，故溪流倒木的现存量为１．７３３ｍ＾３／１００ｍ和１０．８３ｍ＾３／ｈｍ＾２。溪流倒木的树种组成和不同树种的材积与河岸带植被密切相关，但存在差异。研究表明林分形成倒木并进入河流在时间上可能是均匀或随机的，但不同树种间，其形成倒木并进入河流时的树木材积或生长年龄存在较大差异。溪流倒木和林地活立木的个体数量的径级分布基本上为反Ｊ型，而它们材积的径级分布均为典型的Ｊ型。

A Preliminary Study on In-stream Fallen Wood in Erdaobaihe Forested Watershed, Changbai Mountain

Fallen wood is an important ecological component in many terrestrial and aquatic ecosystems, and in forest ecosystems, fallen wood has many crucial ecological functions such as habitat for organisms, a site for nitrogen fixation, energy flow, and nutrient cycling. So, study on fallen wood is an important aspect in traditional forest ecology. While fallen wood in forest ecosystems, especially in riparian forests, turns into stream ecosystems because of natural power or human power, it is turned into in st...