A research paper has recently been published describing a nice experiment carried out in Surrey.  It’s now well known that Wildflower meadows can make a significant contribution to carbon capture and sequestration, but there are various different ways of establishing species-rich meadows.  This paper describes research looking at the effects of various ways of establishing wildflower meadows, and their differing effects on the soils ability to retain carbon.  It’s open access so anyone can read it:

https://www.academia.edu/2997-6006/1/2/10.20935/AcadEnvSci6238