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    • Rangeland Ecology & Management, Volume 62 (2009)
    • Rangeland Ecology & Management, Volume 62, Number 4 (July 2009)
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    Grazing Density Effects on Cover, Species Composition, and Nitrogen Fixation of Biological Soil Crust in an Inner Mongolia Steppe

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    Author
    Liu, Huajie
    Han, Xingguo
    Li, Linghao
    Huang, Jianhui
    Liu, Hongsheng
    Li, Xin
    Issue Date
    2009-07-01
    Keywords
    acetylene reduction assay
    nitrogen fixation
    nitrogen input
    soil stability
    
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    Citation
    Liu, H., Han, X., Li, L., Huang, J., Liu, H., & Li, X. (2009). Grazing density effects on cover, species composition, and nitrogen fixation of biological soil crust in an inner Mongolia steppe. Rangeland Ecology & Management, 62(4), 321-327.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643035
    DOI
    10.2111/08-179.1
    Additional Links
    https://rangelands.org/
    Abstract
    Biological soil crusts (BSCs) are important in many arid and semiarid ecosystems for their abilities to fix atmospheric nitrogen (N) and stabilize surface soil. Grazing disturbance has a profound influence on abundance, species composition, and ecological functioning of BSCs. To elucidate the effects of grazing on BSCs in Inner Mongolia grasslands, an investigation was conducted in a typical steppe that had previously been subjected to long-term grazing with six grazing densities (control: 0 sheep ? ha21, very light: 4 sheep?ha21, light: 8 sheep?ha21, medium: 12 sheep?ha21, heavy: 16 sheep?ha21, and very heavy: 20 sheep?ha21). Cover, species composition, potential N-fixing activity, and potential N input of BSC indicate that long-term grazing significantly reduced the importance of BSC in N input and soil stabilization. Such reductions were highly related to grazing density. Very light grazing had no significant effect on the role of BSC in soil stabilization, but resulted in a 13.3% reduction in BSC N input potential. Heavy and very heavy grazing led to a decrease of potential N input by one order of magnitude, and a decline of BSC function via a shift from high coverage of an attached group-dominated BSC community to a low coverage of a vagrant group-dominated community. Constraining grazing level to a very light density—and to a lesser extent, a light grazing density—is likely a preferred practice for conserving BSC and the ecological services it provides in N fixation and soil stabilization. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-179.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 4 (July 2009)

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