天水小陇山红豆杉(Taxus chinensis (Pilg.) Rehd)林土壤真菌多样性及其与生态因子的相关性

采用GPS系统采集了天水小陇山红豆杉林9块样地的土样，用稀释平板法对该区域真菌进行分离计数，进一步鉴定到属，并分析了真菌数量和类群与土壤养分、水分和pH等生态因子的相关性.结果表明，该区域土壤真菌数量和类群组成存在较大的空间变异，土壤真菌优势菌群的构成有相似性，青霉属、毛霉属为所有样地的优势菌群.真菌多样性分析表明，小陇山红豆杉物种多样性较丰富，不同样地多样性指数差异明显.土壤真菌总数、类群和多样性与土壤生态因子间的相关性分析表明，真菌总数与土壤pH呈显著负相关(R-0.796)，与水分和有机质呈显著正相关；Shannon-Wiener指数与土壤有机质呈显著正相关；各属与土壤生态因子呈现不同的相关性. 

The Diversity of Soil Fungi and Its Relations with Fertility Factors in Taxuschinensis (Pilg.) Rehd Community of Xiaolongshan of Tianshui City

With the help of Global Position System (GPS), nine surface soil samples were collected from the Taxus chinensis (Pilg.) Rehd plantation of Xiaolongshan of Tianshui City. The quantities and diversity of soil fungi were determined by dilution plate technique, and their correlations with soil fertility, soil humidity, and soil pH were analyzed. The results showed that in this region, the amount and group distribution of soil fungi showed a big spatial variability, thefermentation microorganisms of soil fungi had similarity in composition, and the dominant fungal genera are Penicillium and Mucor. The diversity of genus was relatively rich, and the index of diversity was different in different samples. The negative correlation between the quantities of fungi and pH was significant (R-0.796), the correlation among the quantities of fungi, water content andorganic matter was significant; the correlation between the Shannon-Wiener index andorganic matter was significant; the correlations among the genus and soil ecological factors were different.