贵州务川汞矿区土壤丛枝菌根真菌多样性研究

对贵州务川汞矿区不同水平汞污染植物根际土壤丛枝菌根(Arbuscular Mycorrhizal,AM)真菌资源分布及多样性进行分析，结果发现：本研究选取的务川汞矿区3个样地土壤汞含量在94.1～268.0 mg/kg，远高于国家规定的土壤汞含量，汞污染极其严重。随着汞含量增加，AM真菌侵染率、孢子密度显著降低，AM真菌群落丰富度、多样性及均匀度均有所降低，但差异未达显著水平，而仍有部分对汞污染耐受性较强的AM真菌有较高的分布。另外，管柄囊霉属AM真菌在5个样品中均有较高丰度，球囊霉属AM真菌在火棘根际的相对丰度随着汞含量升高而升高，因此，火棘–管柄囊霉属AM真菌或火棘–球囊霉属AM真菌联合进行汞污染修复，有一定的应用价值。

Diversity of Arbuscular Mycorrhizal Fungi in Wuchuan Mercury Mining Area, Guizhou Province

The distribution and diversity of arbuscular mycorrhizal (AM) fungi in Wuchuan mercury (Hg) mining area of Guizhou Province were studied, and the results showed that soil Hg contents in three samples ranged from 94.1 to 268.0 mg/kg, which were much higher than the national guideline concentration. Hg pollution was extremely serious. With the increase of Hg concentration, AM inoculation, the density of spores decreased significantly, while the abundance, diversity and evenness were decreased insignificantly. However, some AM fungi species with high tolerance to Hg contamination still had high distribution. The relative abundance of Funneliformis was also found high in all the five samples, and the relative abundance of Glomus in Pyracantha rhizosphere increased with the increase of Hg concentration. Therefore, the combination of Pyracantha- Funneliformis spp. or Pyracantha-Glomus spp. maybe used in the remediation of Hg contamination.