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litter mixing significantly affects decomposition in the Hulun Buir meadow steppe of Inner Mongolia, China

Journal of Plant Ecology 2014年第1期7卷 59-67页

作者： Caihong Zhang Shenggong Li Leiming Zhang Xiaoping Xin Xingren Liu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesDatun Road 11AChaoyangBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China

Aims We explored the decomposition rates of single-and mixed-species litter,the litter-mixing effect and the effect of component litters in a mixture on *** In a litter bag experiment,shoot litters from two dominant grasses(Leymus chinensis and Stipa baicalensis)and one legume(Melissitus ruthenica)were decomposed separately and as a mixture from May 2010 to September 2011 in the Hulun Buir meadow steppe of Inner Mongolia,*** separated the litter mixture into its individual component litters(*** different single-species litters)and analyzed the changes in litter mass remaining and litter nitrogen(N)remaining during single-and mixed-species litter *** Findings(i)litter mixing had significant positive effects on litter *** litter-mixing effect was strongest for the mixture of *** and *** litters,followed by the mixture of *** and *** litters.(ii)single-species component litters decomposed faster in the mixtures than separately(positive effect),but these effects were not significant for legume species *** *** to single-species litter decomposition,the decomposition rates of the two grass(*** and ***)litters significantly increased when they were mixed with each other or with *** litter.(iii)For each species litter type,the percentage of litter N remaining during decomposition(NR)differed between the single-species litter and mixed litter *** NR of *** litter was higher when it was decomposed in the mixture than in ***,the NR of *** litter was lowest in its mixture with *** among the *** of its decomposition in the mixture or in isolation,the NR of *** litter varied little among *** was a significant positive relationship between the NR and percentage of initial litter mass remaining in both the single litter and mixed litter ***

关键词： non-additive effect interaction strength single litter mixed litter nutrient concentration

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