We have conducted comparative analysis of growth and physiological performances of planted Poplar (Populus sibirica Tausch) trees in dry-steppe of Mongolia with the objectives of 1) to determine effects of irrigation and fertilizer on the growth of trees; 2) to evaluate the physiological responses of planted trees on different irrigation and fertilization treatments. Two-year-old seedlings were planted in 2011 at four different irrigations (ambient, ambient+42mm/tree-1, ambient+84mm/tree-1, ambient+182mm/tree-1) and two fertilizer NPK (16:12:10); sheep manure (COMP) treatments and seven years of monitoring results on revealed that all measured variables (root collar diameter, height, survival rate, stomata number and their aperture, leaf water potential and leaf biomass) were significantly differed among treatments. Excellent growth performance was observed in trees grown at ambient+182mm/tree-1and fertilized with NPK, respectively. Mean survival rate was 96.4% and the lowest was observed in ambient treatment with 12.5%. Diurnal measurement of leaf water potential revealed that trees were stressed by water deficit between 12:00-14:00 with lowest water potential in irrigation treatment ambient+84mm/tree-1 (-3.3±0.06MPa). Poplar trees grown in ambient treatment were more stressed by water deficit and could not recovered its required water even at predawn. Stomata aperture (open, half-closed, closed stomata) of trees tend to have more closed stomata in ambient treatment and trees in ambient+182mm/tree-1 treatment showed high fluctuation of stomata aperture such as opening at predawn and closed at noon. Consideration of ecologically and physiologically important genetic variation within species is important which could be integrated into species selection strategies for successful ecological restoration.
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