中国东北地区红松大型木生真菌物种多样性和区系组成OA

As the decomposers of wood,wood-inhabiting macrofungi play an important role in maintaining the biogeochemical cycles of ecosystems.Pinus koraiensis is an important coniferous tree in China.In order to understand the species diversity and funga of wood-inhabiting macrofungi on P.koraiensis,comparative analysis of its growth substrates,species composition,ecological habits and fungal characteristics was conducted at the region of northeastern China.As a result,174 species of wood-inhabiting macrofungi belonging to 113 genera 49 families and 12 orders were identified,where the dominant families were Postiaceae,Hymenochaetaceae,Incrustoporiaceae and Polyporaceae with their species number accounting for 32.19％of the total investigated species.The dominant genera were Skeletocutis and Gloeophyllum,on the other hand,whose species occupied 9.77％of the total species.In terms of decay type,white-rot fungi had a distinctly higher ratio than brown-rot fungi.69.64％of brown-rot fungi grew on coniferous trees,higher than the proportion on broad-leaved trees,indicating that brown-rot fungi play an important role in the material cycling of coniferous forest ecosystems in Northeast China.Fallen trunks,rotten wood and tree stumps were thought as the most important substrates because of the fact that the majority of wood-inhabiting macrofungal species grew on them and a very small number of species were found on twigs.Analysis of the fungal compositions indicated that there existed eight kinds of geographical elements in which the temperate,boreal to temperate and temperate to subtropical species respectively accounted for 27.59％,27.01％,22.99％,revealing thereafter an obvious feature of temperate funga shown by the wood-inhabiting macrofungi detected in the northeastern China area.