中国盐碱土壤中AM菌的生态分布

对我国盐碱土壤中丛枝菌根（Ａｒｂｕｓｃｕｌａｒ Ｍｙｃｏｒｒｈｉｚａ，ＡＭ） 菌的种属构成、生态分布状况进行了研究．结果表明，不同地区ＡＭ 菌种属构成不同，其种属组成、分布与土壤类型、碱化度和土壤有机质含量有关．盐渍化砂土、壤土和粘土中，Ｇｌｏｍｕｓ 属的真菌数量最多，Ａｃａｕｌｏｓｐｏｒａ 属次之，而Ｇｌｏｍｕｓ 属中的Ｇ．ｍｏｓｓｅａｅ 则是分布最为广泛的菌种．随土壤碱化度的增加，Ｇｌｏｍｕｓ ｍｏｓｓｅａｅ 出现频率随之相对增加．在一定范围内有机质含量越高，土壤中ＡＭ 菌种和属的种类就越多．ＡＭ 菌的种属组成因不同寄主植物而异，其中豆科植物根围中ＡＭ 菌分布的种属数量最多．

Ecological distribution of arbuscular mycorrhizal fungi in saline alkaline soils of China

The compositions of species and genera of arbuscular mycorrhizal (AM) fungi in saline alkaline soils of China and their ecological distributions were studied in this paper. They were correlated to soil type, alkalinity and organic matter content. The species number of Glomus genus was the highest in sandy, loam and clay soils, followed by Acaulospora genus. Glomus mosseae was the dominant species in these soils. The frequency of G. mosseae was increased with increasing alkalinity. In a certain extent, the higher the content of soil organic matter, the more the species were isolated. The components of the genus and species of AM fungi were also influenced by host plants, and the numbers of them in the rhizospheric soils of leguminous plants were greater than those in others.