Abstract
Background and aims Cupressaceae species thrive on calcareous soils and accumulate calcium (Ca) in their tissues. High nitrification rates occur in soils under these species, and many prefer nitrate (NO3) as a nitrogen (N) source. We tested the hypothesis that high levels of available Ca enhance NO3 uptake to a greater degree in Cupressaceae than Pinaceae using seedlings of Thuja plicata and Callitropsis (Chamaecyparis) nootkatensis compared with Pseudotsgua menziesii and Tsuga heterophylla.
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