植物生态学报 ›› 2018, Vol. 42 ›› Issue (2): 252-260.doi: 10.17521/cjpe.2017.0138

• 研究论文 • 上一篇    

西北荒漠带花棒根际丛枝菌根真菌生态地理分布

刘海跃,李欣玫,张琳琳,王姣姣,贺学礼()   

  1. 河北大学生命科学学院, 河北保定 071002
  • 出版日期:2018-02-20 发布日期:2018-04-16
  • 通讯作者: 贺学礼 E-mail:jshe@pku.edu.cn
  • 基金资助:
    国家自然科学基金(31470533)

Eco-geographical distribution of arbuscular mycorrhizal fungi associated with Hedysarum scoparium in the desert zone of northwestern China

LIU Hai-Yue,LI Xin-Mei,ZHANG Lin-Lin,WANG Jiao-Jiao,HE Xue-Li()   

  1. College of Life Sciences, Hebei University, Baoding, Hebei 071002, China
  • Online:2018-02-20 Published:2018-04-16
  • Contact: Xue-Li HE E-mail:jshe@pku.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(31470533)

摘要:

2015年7月, 沿荒漠植物花棒(Hedysarum scoparium)天然分布带, 在内蒙古、宁夏、甘肃选取7个典型样地, 采集花棒根际0-30 cm土层样品, 研究丛枝菌根(AM)真菌群落结构变化和土壤因子的生态功能。试验基于形态特征对分离的AM真菌孢子进行分类鉴定, 共分离鉴定AM真菌6属42种。群落结构分析表明不同样地的AM真菌群落结构差异显著, 土壤因子对AM真菌群落有重要影响。由东到西随干旱程度加剧, AM真菌种丰度、孢子密度、Shannon-Wiener指数逐渐降低。共有种孢子密度由东向西逐渐降低, 但在群落中所占比例逐渐增加。同一样地不同AM真菌种属、不同样地同一种属的AM真菌孢子密度不同。相关性分析结果显示土壤有机碳、pH值、氨态氮和有效磷对AM真菌影响显著, 土壤湿度对AM真菌影响极显著。结果表明花棒根际AM真菌群落结构和物种多样性具有明显的空间异质性, 并与土壤因子关系密切, 其中土壤湿度对AM真菌生态分布的影响最明显。

关键词: 丛枝菌根真菌, 物种多样性, 空间分布, 花棒, 西北荒漠

Abstract:
Aims To understand the ecological significance of arbuscular mycorrhizal (AM) fungi associated with Hedysarum scoparium in semi-arid and arid lands, species diversity and ecological distribution of AM fungi associated with Hedysarum scoparium were elucidated in a desert ecosystem of northwestern China. Methods Soil samples (0–30 cm depth) under Hedysarum scopariumis were collected at seven different sites (Ordos, Wuhai, Dengkou, Alxa, Shapotou, Minqin, Anxi) in northwest China in July 2015. Based on the morphological characteristics of spores, AM fungi were identified, and redundancy analysis (RDA) was used to distinguish among different groups. Furthermore, the relationship between species diversity of AM fungi and soil factors were evaluated by Pearson’s correlation analysis. Important findings A total of 42 AM fungal species belonging to six genera were isolated. Among these, 16 species belong to Glomus,17 to Acaulospora four to Claroideoglomus,two to Septoglomus,two to Funneliformis and one to Scutellospora.The abundance, spore density and Shannon-Wiener index of AM fungi decreased gradually along the aridity gradient from east to west. Spore density of AM fungi of different species in the same site were different, and those of the same species in different sites were also different. Soil organic matter, pH,ammonia, and available phosphorus had significant effects on AM fungi. The results showed that the species diversity and distribution of AM fungi have obvious spatial patterns, and were influenced by soil factors, among which soil moisture was the most significant factor.

Key words: arbuscular mycorrhizae fungi, species diversity, spatial distribution, Hedysarum scoparium, desert zone of northwestern China