干旱区研究

干旱区研究 ›› 2011, Vol. 28 ›› Issue (5): 813-819.

• 植物生态与植物地理 • 上一篇    下一篇

2种沙蒿根围AM真菌时空分异

 山宝琴1,2, 贺学礼2   

    1. 延安大学 能源与环境工程学院,陕西 延安 716000
    2. 西北农林科技大学 生命学院,陕西 杨凌 712100
  • 收稿日期:2010-09-15 修回日期:2011-05-05 出版日期:2011-09-15 发布日期:2011-10-16
  • 作者简介:山宝琴(1970-)，女，新疆乌鲁木齐人，副教授，博士，从事土壤微生物和环境生态学研究. E-mail:xiaoshanbao@163.com
  • 基金资助:

    陕西省自然科学基金项目(2010JQ5007)；陕西省教育厅科研项目(2010JK920)；延大校内基金(YD2009-03)

Spatiotemporal Distribution of AM Fungi in the Rhizosphere of Artemisia ordosica and A. sphaerocephala in Desert

 SHAN  Bao-Qin1,2, HE  Xue-Li2   

    1. College of Energy and Environmental Engineering, Yan'an University, Yan’an 716000, Shaanxi Province, China
    2. College of Life Science, Northwest A & F University, Yangling 712100, Shaanxi Province, China
  • Received:2010-09-15 Revised:2011-05-05 Online:2011-09-15 Published:2011-10-16

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摘要： 为阐明荒漠生境中沙生植物根围AM真菌时空分布规律及其与土壤因子的关系，在陕西省榆林市北部沙地设立样地，于2007年4月、7月、10月在密集型克隆植物黑沙蒿(Artemisia ordosica)和白沙蒿(Artemisia sphaerocephala)根围分0～10 cm，10～20 cm，20～30 cm，30～40 cm和40～50 cm 5个土层采集土壤样品，并以非克隆植物猪毛蒿(Artemisia scoparia)为对照，系统研究了2种沙蒿根围AM真菌时空分布及其与土壤因子的相关性。结果表明：2种沙蒿根系都能形成菌丝、泡囊、丛枝等典型共生结构，黑沙蒿菌丝定殖率达90.72%，白沙蒿达89.63%。黑沙蒿和白沙蒿根围孢子密度最大在0～10 cm土层，并随土层加深显著递减。AM真菌孢子密度在7月最大，而丛枝定殖率相反。黑沙蒿根围孢子密度与土壤速效磷、有机质、温度和碱性磷酸酶活性均呈显著正相关，丛枝定殖率与土壤速效磷、有机质和碱性磷酸酶活性均呈显著负相关。3种宿主植物相比较，非克隆植物猪毛蒿根围孢子密度最大，但菌丝定殖率、泡囊定殖率和丛枝定殖率显著较低。

关键词: AM真菌, 时空分异, 黑沙蒿（Artemisia ordosica）, 白沙蒿（Artemisia sphaerocephala）, 榆林, 陕西

Abstract: The objective of this study is to elucidate the ecologic function of AM fungi and the interaction between sandfixation plants and AM fungi so as to provide more information for utilizing AM fungi and regenerating environment in desert regions. The study was carried out in the rhizosphere of Artemisia ordosica and A. sphaerocephala in north sandy land of Yulin city. The soil samples in profile of 50 cm in the rhizosphere of two host plants were collected at depths of 0-10, 10-20, 20-30, 30-40 and 40-50 cm in April, July and October 2007. The results show that both the host plants could form well symbionts with AM fungi in desert. The hyphal colonization of AM fungi of A. ordosica was 90.72%, that of A. sphaerocephala was 89.63%, and both of them formed the intermediate type mycorrhizas. The highest value of spore density occurred in soil layer of 0-10 cm, and the spore density was decreased with the increase of soil depth from 0 to 50 cm. The highest value of spore density occurred in July and was much higher than that in April and October, but the arbuscular colonization was reverse. Spore density of A. ordosica was significantly and positively correlated with available P, organic matter content, temperature and alkaline phosphatase. Arbuscular colonization was negatively correlated with available P, organic matter content and alkaline phosphatase. Spore density of A. scoparia was much higher than that of other two plants, but hyphal, vesiclar and arbuscular colonizations of AM fungi were much lower.

Key words: AM fungi, spatiotemporal distribution, Artemisia ordosica, Artemisia sphaerocephala, Yulin city, Shaanxi Province

中图分类号: 

  • Q948.12