干旱区研究

干旱区研究 ›› 2015, Vol. 32 ›› Issue (5): 849-855.doi: 10.13866/j.azr.2015.05.03

• 土壤环境 • 上一篇    下一篇

青藏高原东北缘土壤微生物群落结构变化

斯贵才1, 王光鹏2,3, 雷天柱1, 张更新3, 夏燕青1, 陈芳荣1   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000;
    2.冰冻圈科学国家重点实验室,中国科学院寒区旱区环境与工程研究所,甘肃 兰州 730000;
    3.中国科学院青藏高原研究所,北京 100101
  • 收稿日期:2013-12-10 修回日期:2014-04-17 出版日期:2015-09-15 发布日期:2015-10-14
  • 作者简介:斯贵才(1985-),男,助理研究员,主要研究方向地质微生物. E-mail: sgcstchhh@126.com
  • 基金资助:
    中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室开放基金项目(SKLCS-OP-2013-02);国家自然科学基金青年基金项目(41301062)资助

Microbial Community Structural Change in Northeastern Tibetan Plateau

SI Gui-cai1, WANG Guang-peng2,3, LEI Tian-zhu1, ZHANG Geng-xin3, XIA Yan-qing1, CHEN Fang-rong1   

  1. 1. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    2. State Key Laboratory of Cryospheric Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    3. Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2013-12-10 Revised:2014-04-17 Published:2015-09-15 Online:2015-10-14

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摘要： 选取青藏高原东北缘地区自然降水梯度下土壤样品,利用磷脂脂肪酸(PLFA)技术研究了土壤微生物群落结构随年平均降水量变化情况,探讨引起微生物群落结构变化的主要因子。结果表明:随着年平均降水量的下降,土壤有机碳和全氮含量显著下降。细菌、真菌和放线菌含量随着年降水量的下降而显著减少,但在干旱区生物量有增加趋势,表明干旱地区少量的降水不会引起微生物量的显著改变。经相关分析与典范对应分析,在0~5 cm和5~10 cm土层,年降水量与土壤主要理化性质、土壤微生物量有着显著的相关关系,表明在干旱半干旱地区年降水量是影响土壤微生物群落结构的主要因子,并且在0~5 cm土层更加显著。

关键词: 土壤微生物, 群落结构, 降水量, 土层深度, 青藏高原

Abstract: Soil microbial response to climate change will affect the whole ecological process,and represent many uncertainties feedback of ecosystem to climate change. Six sample sites and two soil depths (0-5 cm,5-10 cm),a total of twelve samples were collected along a mean annual precipitation (MAP) gradient in arid and semi-arid,northeastern of Tibetan Plateau and PLFA technology was used to analyze microbial community structure and total microbial biomass. These results showed that total organic carbon and total nitrogen were significantly declined with the MAP decreasing,which was also found in bacteria,fungi,actinomycete biomass. However,microbial biomass had an increased trend in the extreme arid area. Person correlation analysis and Canonical Correspondence Analysis showed that both in 0-5 cm and 5-10 cm soil depth,MAP had a significant correlation with soil physicochemical properties and soil microbial biomass indicate that MAP was a key factor in soil microbial community structure in arid and semi-arid area,which was more significant in 0-5 cm soil depth. The study will provide theoretical basis for further studies of soil microorganisms' response to the water landscape change in the background of global climate change in arid zone.

Key words: soil microorganism, community structure, precipitation, soil depth, Tibet Plateau