The Biodiversity Of The Myxomycetes Of The Changbai Mountains In Jilin Province

Species diversity, flora diversity, community diversity and ecological diversity of myxomycetes from the Changbai mountains were studied systematically in this paper.The results of the species diversity study were that more than 3000 specimens were gotten and 210 species were identified, which belonged to 32 genus 10 families and 6 orders and occupied half of the number of China myxomycetes (412 species). Among them, 9 species were new to Jilin province, which were all given morphological descriptions. A species diversity list and a genus index of Changbai Mountains' myxomycetes were given. All the voucher specimens were deposited in the Herbarium of the Mycological Institute, Jilin Agricultural University (HMJAU).The results of flora diversity study showed that the flora composition of the myxomycetes from Changbai Mountains was very rich. Among them, the number of big families, including more than 20 species per family, were 5, which had 195 species and occupied 92.86% of the total number of Jilin province myxomycetes; the number of big genus, including more than 10 species per genera, were 7, which had 144 species and occupied 68.75% of total number of Jilin province myxomycetes. Seen from the flora composition at the level of species, cosmopolitan ones and north temperate ones were the main distribution types, which occupied 66.66% of total number of Jilin province myxomycetes. Otherwise, the endemic species of this area were abundant too. The results of comparisons showed that the similarity between Changbai Mountains and coastal areas was comparatively high.The results of community diversity study showed that there were differences in myxomycetes species diversity among these three types of plant communities. Among them, the richest myxomycetes species diversity existed in the 'Fraxinus mandshurica + Quercus mongolica + Pinus koraiensis' community (type II). The harmful factors to myxomycetes were bad ventilation, surplus water and existence of Juglans mandshurica.The ecological diversity study was done on two ways that were substrate diversity and seasonal fluctuation of climate. In the theropencedrymion at Erdaobaihe of Changbai Mountains, the dead woods of Acer spp. and Tilia spp. were the optimum substrate for myxomycetes. But there was not myxomycetes living near Juglans mandshurica. In a year, the yield of myxomycetes maintained the highest level from the first ten-day period of July tothe middle ten-day period of September, especially in the last ten-day period of July; the species diversity of myxomycetes reached the highest level in the last ten-day period of July. In a year, the optimum period for myxomycetes was the days that its day highest temperature between 22C and 30C and day lowest temperature between 10C and 18C. In a year, the optimum period for myxomycetes was the days that its day humidity between 66% and 96%. Particularly, we found myxocommensalism.