稳定碳同位素技术在r土壤根际激发效应研究中的应用

摘要

根际激发效应促进了碳氮元素在生态系统植物-土壤-微生物间的流转,维持着生态系统各组分间的养分平衡,并在土壤有机碳动态和稳定性方面起着重要的作用.稳定碳同位素作为一种天然的示踪剂,随着同位素分析技术的发展和完善,在土壤碳循环研究中得到广泛应用.采用稳定同位素示踪技术,能够有效量化植物对土壤有机质分解激发效应的方向和强度,揭示土壤根际激发效应的发生机制.本文对稳定同位素技术在根际激发效应的强度、影响因素和发生机制方面的应用进行阐述,并对稳定同位素技术在根际激发效应中的研究应用进行了展望.%Rhizosphere priming effect promotes the flow of carbon and nitrogen element in the plants ,soil ,microbial ecosystem ,maintains the nutrient balance of ecological system components ,and plays an important role in the deep understanding of soil organ-ic carbon dynamics and stability . With the development and improvement of isotope analysis techniques ,the stable carbon isotope as a natural tracer has been widely used in the soil carbon cycling research of agricultural ecosystems .The use of stable isotopic tracer technology can effectively quantify the direction and strength of rhizosphere effect on soil organic matter decomposition ,and reveal the mechanism of the occurrence of rhizosphere effect .The application of stable isotope technology in the strength ,influ-ence factors and mechanism of rhizosphere priming effect were reviewed .The outlooks of research in the rhizosphere priming effects were discussed and clarified with the regard to more theoretically explore the internal mechanism of soil carbon and nitrogen cycle ,promote the in-depth understanding of the processes of terrestrial ecosystem underground .