Volume 14, Issue 2 (7-2020)                   مرتع 2020, 14(2): 286-298 | Back to browse issues page

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Sadeghirad A, Tavili A, Jafari M, Zare S. Morphological and Physiological change of Haloxylon ammodendron Contaminated with Heavy Metals. مرتع 2020; 14 (2) :286-298
URL: http://rangelandsrm.ir/article-1-907-en.html
Department of Arid and Mountains Regions Reclamation, Faculty of Natural Resources, University of Tehran, Karaj
Abstract:   (2742 Views)
Haloxylon ammodendron is one of the most important species for vegetation development in dry areas as well as combating desertification. So, it is important to understand its behavior and morphophysiological changes against heavy metals stress. Because of this, the positive or negative effects of heavy metals on its morphophysiological characteristics was the aim of this research.  Two parallel transects, one kilometer in length, were placed on the ground and five sampling sites 200m apart were set along each transect. In total, 60 samples of shoots and roots of Haloxylon ammodendron were collected. Their morphological and physiological characteristics in three zones were tested to measure heavy metals (Cr, Co and Cd). Statistical analyses were carried out using SPSS 22 statistical software by ANOVA method and Duncan test. The results showed that the different treatments had significant differences in morphological characteristics except diameter and collar environment.  The results also showed a significant difference between the three treatments in terms of chlorophyll a and b, total chlorophyll, carotenoid and proline (P <0.05).  Maximum height (126.4 cm), diameter (137.5 cm), crown area (1.65 m2), canopy environment (4.95 m2), growth index (1.31), chlorophyll a (1.68 mg/g), chlorophyll b (0.32 mg/g), total chlorophyll (2.09 mg/g), carotenoid (5.95 mg/g) were in control area and the highest proline (19.16 mg/kg) was in the infected area. Also, different treatments in shoot and root had significant differences in the amount of Cr, Co and Cd (P <0.05).
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Type of Study: Research | Subject: Special
Received: 2020/07/29 | Accepted: 2020/07/31 | Published: 2020/07/31

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