Fig. 3: The biogeochemical effect of eCO2 on global vegetation Hg(0) uptake.
From: Potential decoupling of CO2 and Hg uptake process by global vegetation in the 21st century
a Global distribution of eCO2 experiments included in this meta-analysis. Circles of orange, blue, and red indicate experiments on crops, grass, and tree, respectively. The numbers outside the parentheses represent the increase in CO2 concentration, while the numbers inside the parentheses indicate the corresponding change rate in Hgveg (based on the four integrated Δ CO2 levels). b The sensitivity of vegetation Hg in response to eCO2 in different types of plants across different experimental studies. The triangle represents one unit of eCO2 (100 p.p.m. increase). Each data point represents the weighted mean values; error bars indicate the 95% confidence intervals. The numbers indicate sample sizes with the number of stars representing significant levels. c Modeled annual global Hg(0) uptake by different types of vegetation under present day and future CO2 levels under the SSP5-8.5 scenario.
