journal6 ›› 2008, Vol. 29 ›› Issue (3): 91-96.

• Biological resources • Previous Articles     Next Articles

Responses of Soil Biological Properties of Betula Roots and Rhizosphere to Short-Term Temperature and CO2 Elevation in the Subalpine Zone


  1. (1.College of Life Science,Sichuan University,Chengdu 610065,China;2.Department of Environmental Science and Engineering,Sichuan University,Chengdu 610065,China;3.Forest and Horticulture College,Sichuan Agriculture University,Yaan 625014,China)
  • Online:2008-05-25 Published:2012-05-23

Abstract: Responses of root biomass,microbe quantities,and enzyme activities in rhizospheric soil of Betula albo-sinensis with high and low densities (13.5 stems·m-2 and 4.5 stems·m-2,respectively) to elevated atmospheric CO2 concentration (15.5±1.0 μmol·L-1 enrichment) and/or temperature (2.4±0.4 ℃ elevation) under the controlled conditions in situ which have been monitored in the subalpine forest zone of the western Sichuan Province.The primary results indicated that root biomass  increased when atmospheric temperature and/or CO2 was elevated under the high and low density.The quantities of bacteria and epiphyte under high and low density,and actinomycetes under low density treatments were promoted by temperature elevation,while quantities of bacteria and epiphytes increased just under high density when CO2 was elevated.Pohyphenol oxidase activity was reduced significantly under temperature elevation in both density treatments.Catalase activity increased under CO2elevation,whereas urease and pohyphenol oxidase decreased in both density treatments.Pohyphenol oxidase and catalase activities decreased under temperature and CO2elevation (ETC) in high and low density treatments,while urease activities varied with plant density under both temperature and CO2 elevation (ETC).

Key words: Subalpine forest soil, soil enzyme activity, elevated temperature, atmospheric CO2 elevation, soil microbe

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