Mineral nutrition of sub-alpine Australian vegetation under nutrient deficiency depends on lifeform

摘要: Abstract We sought to elucidate if the perennial lifestyle per se, or lifeform, enhances independence of soil nutrient availability. measured parameters CO2 fixation and electron transport, stomatal conductance, P N nutrition, as well integrative water relations (δ13C abundance) an overstory tree (Snow Gum; Eucalyptus pauciflora, Sieber ex Spreng.) a understory shrub (Alpine Shaggy-pea; Podolobium alpestre F. Muell.) at two Australian field sites with different availability, but otherwise similar environmental conditions. Snow Gums are renowned for their longevity, including ability re-sprout profusely after fire, while Alpine Shaggy-pea has relatively short lifespan, regenerates from seed fire. Photosynthesis P. were more sensitive properties than E. pauciflora. status leaves roots pauciflora comparable both sites, whereas reflected availability in soil. Differences δ13C abundance species studied indicated use sources sites. These results suggest that long-lived plants capability recycle nutrients woody tissues, can grow largely independent