Document Type : Research Paper
Authors
1
Ph.D. Student of Biology Forest Sciences, Department of Forestry and Forest Economics Faculty of Natural Resources, University of Tehran, Karaj, Iran.
2
Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Irands.
3
Associate Prof., Department of Forestry and Forest Economics Faculty of Natural Resources, University of Tehran, Karaj, Iran
4
Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
5
Assistant Prof,, Agricultural and Natural Resources Research and Education Center, AREEO, Qom, Iran.
10.22034/ijf.2024.424128.1953
Abstract
Introduction and Objective: Shrubs of Haloxylon ammodendron and Tamarix hispida are among the native species that affect the physical, chemical and biological characteristics of the soil in the Turanian vegetation zone of Iran. This research for the first time investigates the seasonal changes of soil respiration in one of the important habitats of this part of Iran (Haloxylon and Tamarix pure habitats, located in Qom province), comparisons of biological characteristics and their possible changes in two parts under canopy and out of canopy. during the two seasons of autumn and spring.
Material and Methods: In spring and autumn, soil samples were taken from the places under and outside the canopy of 30 Haloxylon and 30 Tamarix plants in the east direction of the tree and at a depth of 0-15 cm. All 3 soil samples were randomly combined and finally 20 composite samples were obtained before the test, each soil sample was passed through a 2 mm sieve. The samples were analyzed to measure the chemical factors of carbon, acidity and soil carbon storagr rate and biological factors of basic and induced respiration, carbon microbial biomass and nitrification potential. analysis was done using three-way analysis of variance.
Results: The biological factor of induced respiration has a significant difference at the 95% confidence level (P<0.05) in both species and time levels, the average value of which is 20.97 mg CO2 in day and hour in the soil of Tamarix species in spring and 7.96 mg CO2 in day and hour in Haloxylon species and 2.95 and 2.025 mg CO2 in day and hour in autumn, respectively, and the microbial carbon concentration factor had a significant difference over time and the highest value was in autumn. The average amount of biomass carbon of Tamarix species in autumn 4.08 and spring 2.03, for Haloxylon species in autumn 4.02 and spring 3.03 mg biomass-C 100g ˉ¹ dm was calculated.
Conclusion: The findings show that soil micro organisms are more active in the spring in comparison to autumn and under the influence of the dry period and summer heat, the activity of the microorganisms has decreased, and as the end of the growing season approaches, We are facing a decrease in quality indicators of soil utilization. Considering the positive and significant effect of the Tamarix shrub on the increase of induced respiration and carbon storage, the preservation of this valuable native species should be prioritized.
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