Seasonal variation in productivity, water relations and ion contents of Atriplex halimus spp. schweinfurthii grown in Chott Zehrez wetland, Algeria

摘要

AbstractA population of Atriplex halimus spp. schweinfurthii, a perennial halophyte of Algerian saline steppes, was studied for one year under field conditions in chott Zehrez wetland of Djelfa, Algeria. During the one year, the population was exposed to great variations in soil salinity, pH varied from 7.0 to 8.2, soil conductivity was highest (4.47 dSm−1) in summer and lowest (1.99 dSm−1) in autumn. Soil moisture was relatively low and varied from 7.66% in summer to 21.45% in winter. Plants in the winter and spring seasons showed better growth than the other two seasons. The contents of Na+ and K+ in plant were highest during the summer, however Ca2+ ion content in A. halimus tissues remained constant throughout most of the seasons. The high N was recorded in winter and spring seasons. The succulence remained unaffected during winter, spring and summer seasons and then declined during autumn. This indicates that plants minimize their water uptake during stress to achieve osmotic adjustment, which helps them to survive in chott ecosystem.