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.

在钙质污染的半干旱地区，研究了土壤有机碳（SOC）在400-550 ppm CO ₂的梯度范围内的变化。在Atriplex canescens（Pursh）Nutt的天然和人工植被覆盖下进行了实验。从2012年到2018年，每2年对SOC和植被覆盖率进行一次调查。研究发现，SOC和CO ₂浓度之间存在多项式关系。在最上层20 cm的土壤中，SOC变化率与CO ₂浓度具有最大的正相关： 在种植区和控制区，R ^2分别为0.96和0.47。此外，植物生命形式对CO ₂污染地区的SOC也有重要影响（P  <0.01）。 在这段时间内，分别在0–20和20–40 cm的深度观察到SOC速率变化与多年生覆盖率之间的最高相关性（R ² = 0.93–0.99）。