An overall view of the rhizosphere priming effect

• 作 者: Weixin Cheng
• 机 构: InstituteofAppliedEcology,ChineseAcademyofSciences,Shenyang,China;EnvironmentalStudiesDepartment,Uni
• 出 处: International Symposium on Forest Soils(2013年森林土壤国际研讨会)
• 发表日期: 2013年9期
• 关键词: Soil organic C decomposition plant-soil interactions nitrogen mineralization ele

　　Rhizosphere interactions, at the global scale, may control as much as 50% of the total CO2 released from terrestrial ecosystems and regulate virtually all aspects of nutrient cycling.One crucial component of these thizosphere interactions is the thizosphere priming effect (RPE) which is defined as the stimulation or suppression of soil organic matter decomposition by live roots and associated thizosphere organisms when compared to SOM decomposition from rootless soils under the same environmental conditions. Current results indicate that the RPE can enhance soil organic matter decomposition up to 380% or reduce it by 50%, depending on actual plant-soil conditions. Furthermore, global increases in atmospheric CO2 concentration and surface temperature can significantly alter the magnitude of the RPE, which may play into future climate change. Therefore, incorporating the RPE into future ecosystem models is needed for accurately forecasting potential responses of terrestrial ecosystems to global environmental change. Overall, collective evidence indicates that the RPE is emerging as a crucial mechanism in terrestrial ecosystems, which warrants substantial future research and model development.