阔叶红松林山杨伐根分解过程中真菌动态研究

山杨是长白山阔叶红松林中的常见阔叶树种,择伐后的伐根很多.山杨伐根在多种真菌的作用下逐渐分解,不断地向周围释放养分,构成保证森林生态系统稳定循环的一个重要环节.随分解的不断进行,山杨伐根上的真菌的种类和数量都呈现出一定的变化趋势.真菌数量高峰出现在伐后的第5年,而种类高峰则出现在伐后的第7年.这一时间上的交错现象是由真菌的不同分解能力引起的.分解能力强的主要分解菌将难于分解的木质素、纤维素等分解为易于利用的小分子物质,为其他真菌提供了营养来源,便于其他真菌的定殖.另外,伐根上的真菌数量还与伐根桩径呈正相关关系.

Fungi's dynamic development during the period of Populus davidiana stump decomposition in the broadleaved-Korean pine forests

Populus davidiana is a popular species in the broadleaved-Korean pine forests in Changbaishan Mountains and there are lots of stumps there after selective felling. The stump is decomposed with fungus and the nutrition is released gradually. So the stump is a key to keep the forest ecosystem balance. During the decomposition procedure, there are a lot of fungus appearing on P. davidiana. The fungus number and the species are both changed with the decomposition time. The fungus peak amount appears in five years, and the species peak appears in seven years, they are caused by the fungi's different decomposing ability. The main fungi change the lignin and fibrin, which are hard to be decomposed, to smaller molecular substances, which are the nutrition of the other fungi and easy to be decomposed. Additionally, the fungus amount is correlated with the stump's diameter.