【摘 要】
：
Introduction : Symbiotic arbuscular mycorrhizal fungi(AMF)produce a recalcitrant AM-specific glycoprotein,glomalin-related soil protein(GRSP,Wright & Upadyaya 1996),which can improve soil structure(Co
【机 构】
：
South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650;University of Chinese Acad
【出 处】
：
International Symposium on Forest Soils(2013年森林土壤国际研讨会)
论文部分内容阅读
Introduction : Symbiotic arbuscular mycorrhizal fungi(AMF)produce a recalcitrant AM-specific glycoprotein,glomalin-related soil protein(GRSP,Wright & Upadyaya 1996),which can improve soil structure(Comis 2002),fix heavy metal in soils(Cornejo 2008),and proven to be a substantial contributor to soil carbon(Comis 2002;Lovelock 2004).In this study,GRSP and SOC were measured in modeled ecosystem under CO2 enrichment and nitrogen deposition with the respect to access potential influence of environmental change on GRSP and soil carbon.Based on previous studies we hypothesized that(1)Elevated atmospheric CO2 promoted plant growth and increased biomass allocation to belowground(Zhao et al 2012),carbon allocated to mycorrhizal fungi will linearly increased with increasing belowground carbon allocation(Hobbie 2006),therefore,AMF growth may facilitated with CO2 enrichment,as the unique product of AMF,GRSP will increase under elevated CO2.(2)N addition stimulated aboveground biomass accumulation,with decreasing root: shoot ratio(Duan et al 2009),suggested that AMF growth restrained with extra nitrogen fertilization and accordingly decrease GRSP stock.(3)GRSP has no significant change to high CO2 and N deposition in the N restriction area(Maria et al 2008).But high N deposition in our study site leads to higher N availability(Ren et al 2000; Mo 2006),suggested that its non-essential to develop too much AM to obtain available N in our study site plant,so GRSP stock will decrease.
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