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• W2351709493 abstract "Fine root decomposition often plays an important role in maintaining soil fertility and mass cycle in soil ecosystem.As an irreplaceable decomposer in fine root decomposition,soil microorganism is closely linked to the chemical components in fine roots.Many compound models for vegetation restoration were founded in the process of converting farmland to forest(grass),which is beneficial to the development of environment and economy.As yet there is a lack of soil microbial functional group variation related with fine root decomposition although only a few reports have been published.Therefore,we placed 560 intact soil cores in nylon bags with 0.25 mm mesh in Birch(Betula luminifera)-grass(Hemarthria compressa) compound model(HN),birch(Betula luminifera) plantation(H),grassland(Hemarthria compressa)(NC) and cedar(Cryptomeria fortunei) plantation(LS) using intact-core technique for 1 year.Intact soil cores were sampled at 30,90,180,270 and 365 days from the starting date.On each sampling date,we collcted fine roots and soils(grass roots) from each soil core for analysis.Decomposition rates and major microbial functional groups(aerobic azotobacter,ammonifiers,nitrifiers,cellulolytic bacteria) in relation to fine root and grass root decomposition were analyzed.The percentage of initial mass remaining of decomposing roots fitted a single-exponential model.The decomposition constant(k) for the four models were 1.06,0.93,1.32 and 0.86 per year respectively,with an annual loss of 65.49%,60.55%,73.32% and 57.51%.The numbers of aerobic azotobacter and ammonifiers increased consistently until 90 or 180 days,while nitrifiers and cellulolytic bacteria decreased during 30 days,followed by an increase in four models.The numbers of aerobic azotobacter,ammonifiers,nitrifiers and cellulolytic bacteria in HN model were much higher than the other three models during the decomposition period.Aerobic azotobacter in four models showed significant positive correlation with ammonifiers and negative correlation with C/N ratio,and ammonifiers also had positive correlation with nitrifiers.Aerobic azotobacter in HN and LS models showed positive correlation with relative nitrogen content of fine root and grass root.Our results show that fine roots and grass roots decomposition is strongly influenced by synergic interaction among microbial functional groups.It also suggests that biological nitrogen fixation may have an important role in self-sustaining capability for forest-grass compound model." @default.
• W2351709493 created "2016-06-24" @default.
• W2351709493 creator A5053113391 @default.
• W2351709493 date "2009-01-01" @default.
• W2351709493 modified "2023-09-26" @default.
• W2351709493 title "Major Microbial Functional Groups Related to Fine Root and Grass Root Decomposition in Different Models of Conversion of Farmland to Forest in the Rainy Zone of West China" @default.
• W2351709493 hasPublicationYear "2009" @default.
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