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- W66891697 abstract "In most ecosystems, the amount of C (i.e., energy) entering the soil from plant production is only sufficient to meet the maintenance energy requirements of soil microorganisms, allowing for no net annual growth of microbial populations. Because the rising atmospheric CO[sub 2] concentration has the potential to alter patterns of plant production and C allocation, it also has the potential to influence plant litter production and the amount of energy available for microbial growth in soil. We have developed a conceptual model describing the influence of rising atmospheric CO[sub 2] on plant production, soil microorganisms and the cycling of C and N within soil. It is based on the premise that increases in plant production provide the primary link between the rising atmospheric CO[sub 2] concentration and changes in the microbially-mediated transformations C and N within soil. We have argued that increased root growth at elevated atmospheric CO[sub 2] should increase soil C availability, microbial populations, and rates of net N mineralization. Others have proposed alternative ideas, suggesting that elevated atmospheric CO[sub 2] will lead to the production of recalcitrant plant litter and a reduction in rates of C and N cycling. We present evidence from a set of recentmore » of experiments providing support for larger microbial populations and faster rates of C and N cycling in response to rising atmospheric CO[sub 2]. We also summarize the literature, bringing these differing views into perspective. It seems clear, however, that plants mediate the response(s) of soil microorganisms to rising atmospheric CO[sub 2].« less" @default.
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- W66891697 date "1994-06-01" @default.
- W66891697 modified "2023-09-24" @default.
- W66891697 title "Responses of soil microorganisms to changes in plant production with rising atmospheric CO[sub 2]" @default.
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