Growth habit and leaf economics determine gas exchange responses to high elevation in an evergreen tree, a deciduous shrub and a herbaceous annual

Plant growth at high altitudes requires physiological and morphological plasticity to achieve photosynthesis (A) at low temperature, increased radiation, and reduced partial pressure of atmospheric gases, especially carbon dioxide (pCO 2) is. Previous studies have observed that the broad response of plant species rise depends on their adaptability to temperature, elevation range and growth habits. Here we examined the effect of altitude elevation from 2,500 to 3,500 m (a.s.l.) on three species of mountain species with different growth habits and leaf economic strategies. Δ13 C of all species showed the same increase, but dark respiration and nitrogen concentration increased with altitude, species of different leaf economic strategies were observed compared leaf gas exchange and photosynthetic reaction. The deciduous shrub (Salix atopantha) and the annual herbaceous swivel (Rumex dentatus) show an increase in permeation (Gs) and mesophyll (Gm) penetration and enhancement of photosynthetic capacity at higher altitudes. However, Quercus spinosa shows a decrease in the conductivity of CO 2, which is consistent with low level photosynthetic carbon fixation at 3500 m / s. A. The future rise in atmospheric CO2 concentration ([CO2]) may mainly affect low specific leaf area (SLA) and Gm levels. It is an evergreen species. Rather than deciduous trees with higher SLA and Gm values. Depending on the plasticity of the phenotype and the adaptive properties affecting the economy of the leaf, we believe that climate change may affect the plant species that constitute the ecosystem of the highland.

Keywords: altitude, leaf meat conductance, CO2 partial pressure, photosynthesis, hedgehog, swiva, sari, stomatal conductance

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