If invasive species compete with native species for resources and end up dominating the area, do they reduce its ability to serve as a carbon sink since they all are green plants?
Actually invasive species have a negative impact on ecological balance of the system. As you know invasive species disturb food chain and food web of ecosystem.Biomass of the ecosystem might enhance and can fix more and more carbon.
In essence, you mean in an area with more invasive species have less impact in ecosystem functionality such as climate change mitigation. Is that correct?
this question is the other form of your previous question about carbon sink as carbon in form of CO2 is the active form that affect negatively in the case of reduction in vegetative cover and so the same principle of previous answer will fit to this in term of invasive plants and climate change as it is will known that invasion doesn't occur unless the biotic and abiotic factors are unfavorable for the native species. as we are talking about carbon sink we have to distinguish first between the different plant types as it differ from the permanent and temporal vegetative cover, as well as differentiate between herbaceous, shrubs or tree. in general and in my opinion it depends to certain extent as one of the factors that affect climate change in term of carbon traps this action affected by way or another by the type and extent of the biochemical reaction (carbon sequestration) that associate the presence of this plant. plant biomass is the measuring tools to determine and measure trapped carbon, and so it is very important to say that I think yes, invasive plants can act positively on carbon sink as the native types are absent.
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