西双版纳热带雨林中丛枝菌根真菌的初步研究*

对西双版纳热带雨林中30个科的42种植物根系的丛枝菌根真菌定居情况进行了调查，并从这些植物的根际土壤中分离鉴定了分属于无梗囊霉属(Acaulospora)、球囊霉属(Glomus)和硬囊霉属(Sclerocystis)的25种丛枝菌根真菌。对热带雨林土壤中丛枝菌根真菌的孢子密度（spore density）、物种丰富度（species richness）以及已鉴定种的出现频率进行统计分析发现：热带雨林土壤中丛枝菌根真菌的孢子密度在每100g土壤116~1560个之间，平均478个；物种丰富度在2~7之间，平均为4.5；无梗囊霉属和球囊霉属真菌是热带雨林土壤中丛枝菌根真菌的优势类群。

AM FUNGI IN THE TROPICAL RAIN FOREST OF XISHUANGBANNA

The arbuscular mycorrhizal (AM) fungi colonization on the root system of 42 plants (in 30 families) in the tropical rain forest of Xishuangbanna was surveyed. Twenty-five arbuscular mycorrhizal fungi were isolated and identified to the genera of Acaulospora, Glomus and Sclerocystis. The arbuscular mycorrhizal fungal spore density, the species richness and the species frequency in the soil of tropical rain forest were analyzed. It was found that the arbuscular mycorrhizal fungal spore density has a range of 116~1560/100g, average 478/100g(spores /g soil), the species richness was between 2~7 (average 4.5). Acaulospora and Glomus fungi were the dominant AM fungi in the soil of tropical rain forest of Xishuangbanna.