Differential growth costs and nitrogen fixation in Cytisus multiflorus (L ' Her.) Sweet and Cytisus scoparius (L.) Link are mediated by sources of inorganic N

摘要

Shrubby legumes in Mediterranean-type ecosystems face strong nutrient limitations that worsen in summer, when water is absent. Nitrogen-fixing legumes are likely to be able to switch between soil N and atmospheric N (N-2) sources to adjust the C costs of N acquisition in different seasons.