Fine root sodium content per fine root dry mass

Formal name:  fine root sodium content per fine root dry mass
Local identifier:  TOP556
Synonym Term:  fine root Na content per dry mass
Related Term:  fine root Na content
Related Term:  fine root Na concentration
Definition:  The ratio of the quantity (SEP:quantity) of sodium (CHEBI:sodium atom) in the fine root (McCormack:fine root) to the corresponding fine root mass (PATO:mass) assessed after drying
Formal Unit:  mass unit / mass unit or amount unit / mass unit

Comment:  The quantity of sodium can be expressed either as a mass (with mass unit, e.g. gram) or as an amount (with amount unit, e.g. mol). The term concentration is polysemic and we suggest to not use it in this context. We suggest to specify fine roots by branching order instead of diameter (< 2 mm).
Reference:  Eric Garnier, Jens Kattge, Stefan Klotz, Ingolf Kühn, Ulrike Stahl


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