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    Litter Decomposition in Semiarid Grassland of Inner Mongolia, China

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    Author
    Liu, Ping
    Huang, Jianhui
    Han, Xingguo
    Sun, Osbert J.
    Issue Date
    2009-07-01
    Keywords
    grassland ecosystem
    mixture effects
    nutrient dynamics
    nutrient release
    typical steppe
    
    Metadata
    Show full item record
    Citation
    Liu, P., Huang, J., Han, X., & Sun, O. J. (2009). Litter decomposition in semiarid grassland of Inner Mongolia, China. Rangeland Ecology & Management, 62(4), 305-313.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643033
    DOI
    10.2111/08-040.1
    Additional Links
    https://rangelands.org/
    Abstract
    Long-term overgrazing has significantly changed plant species composition in rangeland ecosystems, and this change may alter ecosystem functioning remarkably. In this study, decomposition rates and nutrient dynamics of pure litter (leaf, stem, or root litter) and 11 litter mixtures (from two to five litter components), including nine aboveground litter mixtures and two root litter mixtures, of five common plant species in degraded semiarid rangelands of northern China were studied for 1 yr. We found that fine root litters generally decomposed faster and had faster nutrient turnover rates than leaf and stem litters. The decomposition rates of leaves and stems were significantly and positively correlated with initial litter nitrogen (P < 0.01) and phosphorus contents (P < 0.05), and the decomposition rates of fine roots were significantly and negatively correlated with initial litter carbon:nitrogen ratios (P < 0.05). Nonadditive effects were found in six out of the nine aboveground litter mixtures (three positive and three negative). There were only additive effects on decay rates and nutrient fluxes in the two root litter mixtures. The occurrence and direction of nonadditive effects were dependent on the properties of component litters and had no obvious correlations with litter diversity. Negative mixing effects on nutrient immobilization can facilitate the release of some important nutrients during litter decomposition processes, and further help to accelerate nutrient cycling in such semiarid rangeland ecosystems. Our results indicate that change of plant species composition by overgrazing may slow down the mass loss rates, but may not necessarily impact the release of some nutrients. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-040.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 4 (July 2009)

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