Nonadditive effects of litter mixtures on decomposition and correlation with initial litter N and P concentrations in grassland plant species of northern China |
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Authors: | Ping Liu Osbert J Sun Jianhui Huang Linghao Li Xingguo Han |
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Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, Beijing, 100093, China;(2) Graduate School of the Chinese Academy of Sciences, Beijing, 100049, China;(3) Present address: Soil and Fertilizer Institute, Shandong Academy of Agricultural Sciences, Jinan, Shandong, 250100, China;(4) College of Natural Resources & Environment, Beijing Forestry University, Beijing, 100083, China |
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Abstract: | We studied the occurrence of nonadditive effects of litter mixtures on the decomposition (the deviation of decomposition rate
of litter mixtures from the expected values based on the arithmetic means of individual litter types) of litters from three
plant species (i.e., Stipa krylovii Roshev., Artemisia frigida Willd., and Allium bidentatum Fisch. ex Prokh. & Ikonn.-Gal.) endemic to the grassland ecosystems of Inner Mongolia, northern China and the possible role
of initial litter N and P on such effects. We mixed litters of the same plant species that differed in N and P concentrations
(four gradients for each species) in litterbags and measured mass losses of these paired mixtures after 30 and 80 days under
field conditions. We found the occurrence of positive, nonadditive effects of litter mixtures and showed that the magnitude
of the nonadditive effects were related to the relative difference in the initial litter N and P concentrations of the paired
litters. |
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Keywords: | Decomposition Grassland ecosystems Litter mixture effects Litter N Litter P Inner Mongolia |
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