生物多样性 ›› 2011, Vol. 19 ›› Issue (3): 377-385.DOI: 10.3724/SP.J.1003.2011.09221

• 研究报告 • 上一篇    下一篇

内蒙古荒漠沙柳AM真菌物种多样性

杨静, 贺学礼*, 赵丽莉   

  1. 河北大学生命科学学院, 河北保定 071002
  • 收稿日期:2010-09-16 修回日期:2010-12-09 出版日期:2011-05-20 发布日期:2013-12-10
  • 通讯作者: 贺学礼
  • 基金资助:

    国家自然科学基金项目

Species diversity of arbuscular mycorrhizal fungi in the rhizosphere of Salix psammophila in Inner Mongolia desert

Jing Yang, Xueli He*, Lili Zhao   

  1. College of Life Sciences, Hebei University, Baoding, Hebei 071002
  • Received:2010-09-16 Revised:2010-12-09 Online:2011-05-20 Published:2013-12-10
  • Contact: Xueli He

摘要: 分别于2009年5月、8月和10月在内蒙古黑城子、正蓝旗和元上都3个样地采集沙柳(Salix psammophila)根围0–50 cm土层土样, 研究了AM真菌群落组成及其生态分布特点。在分离的4属37种AM真菌中, 球囊霉属(Glomus)23种, 无梗囊霉属(Acaulospora)10种, 这两属是3样地共同优势属; 盾巨孢囊霉属(Scutellospora)3种, 仅分布在黑城子和正蓝旗样地; 巨孢囊霉属(Gigaspora)1种, 仅分布在正蓝旗样地; 网状球囊霉(G. reticulatum)是3样地共同优势种。AM真菌种丰度、均匀度指数、Shannon多样性指数、Simpson多样性指数大小依次是正蓝旗>黑城子>元上都; 元上都样地的AM真菌组成与其他样地差异显著; 8月和10月的AM真菌种丰度、Shannon多样性指数显著高于5月。随土壤碱解N含量提高, AM真菌种丰度、均匀度指数、物种多样性指数先升后降。结果提示, 在评估荒漠环境沙柳和AM真菌共生关系时, AM真菌生态分布和丰富度是十分有用的指标。

关键词: 国际生物多样性观察年

Abstract: Salix psammophila is an excellent sand-fixation plant that can not only thrive in arid desert environment, but also can fix sand and promote desert management by maintaining the balance and stability of desert ecosystems. To understand the species diversity and ecological distribution of AM fungi associated with S. psammophila, we collected soil samples (0–50 cm deep) from the rhizosphere of S. psammophila at three different sites (Heichengzi, Zhenglanqi and Yuanshangdu) in Inner Mongolia in May, August and October 2009. A total of 37 AM fungal species belonging to four genera were isolated. Of these, 23 species belong to Glomus, 10 to Acaulospora, 3 to Scutellospora, and 1 to Gigaspora. Glomus reticulatum was the dominant species at all three sites, Scutellospora was found only in Heichengzi and Zhenglanqi, and Gigaspora decipiens only in Zhenglanqi. Generally, species richness, evenness, Shannon diversity and Simpson diversity indices showed the following trend across sites: Zhenglanqi > Heichengzi > Yuanshangdu. Species diversity of AM fungi in Yuanshangdu was significantly lower than that at the other sites. Species richness and Shannon diversity index of AM fungi were higher in August and October than in May. Species richness, evenness, and diversity indices first increased and then decreased with increasing levels of soil available N. Our results suggest that the subtle complexities present in the symbiotic relationship between S. psammophila and AM fungi in desert ecosystems.

Key words: The International Biodiversity Observation Year