Changes in soil organic carbon across an atmospheric CO2 gradient under natural and artificial vegetation of semi-arid lands
2021
Yazdanshenas, Habib | Gozidepor Tehrani, Mahkame Sadat | Khorrami Ajirloo, Milad | Tarnian, Farajollah
Soil organic carbon (SOC) was studied across a gradient of 400–550 ppm CO₂ in calcareous contaminated semi-arid areas. An experiment was performed under natural and artificial vegetation cover of Atriplex canescens (Pursh) Nutt. SOC and vegetation cover were investigated every 2 years from 2012 to 2018. Findings disclosed that there was a polynomial relation between SOC and CO₂ concentration. The SOC change rate had the highest positive relationship with CO₂ concentration in the uppermost 20 cm of soil: R² = 0.96 and 0.47 in plantation and control areas, respectively. Moreover, plant life forms had a significant effect on the SOC in CO₂ contaminated areas (P < 0.01). The highest correlation (R² = 0.93–0.99) was observed between SOC rate changes and perennial cover percentage at a depth of 0–20 and 20–40 cm, respectively, through the time.
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