The general background of this research is that a major part of the global carbon pool is stored underground, in our boreal forests, in the form of organic matter. It is only now becoming clear how plant roots contribute to the formation of organic matter, especially to the concentration of nitrogen in it. The latest research on soil nitrogen shows that some plant roots promote high concentrations of organic soil nitrogen, thus contributing to for formation of organic matter, where carbon is stored.
Read the article from Phys.org