植被生态系统汞的生物地球化学循环研究进展与挑战
摘要
Mercury (Hg) is a global pollutant which has been listed by the United Nations Environment Programme focusing on control.Vegetation is a foundational link between atmosphere and pedosphere, and plays an important role in global Hg cycles.Currently, vegetation has been regarded as the important global sink of atmospheric Hg.However, the distinct knowledge gaps in Hg cycling among interface of air-vegetation-soil, and Hg distribution, sources, transformation and their biogeochemical mechanisms in vegetation components, lead to the current global Hg models with the poor parameterization schemes of vegetation related Hg processes.These largely restrain the comprehensive quantification of the vegetation sink for atmospheric Hg across the globe.Recently, the quickly developing Hg isotopic chemistry, HR-XANES/micro-XANES, and micro meteorological mercury flux observation technology provides a new insight in understanding the interface Hg biogeochemical processes among vegetationsoil-air surfaces, and assessing Hg sources and transformation and translocation in vegetations, specifically in forest ecosystems.