One option for increasing pH of sulfuric material may be stimulation of bacterial sulfate reduction. Sulfuric material is formed upon oxidation of sulfidic material it is extremely acidic, and therefore, an environmental hazard. Yuan, Chaolei Fitzpatrick, Rob Mosley, Luke M Marschner, Petra Sulfate reduction in sulfuric material after re-flooding: Effectiveness of organic carbon addition and pH increase depends on soil properties. These findings indicate that afforestation can modify soil pH if tree species and initial pH are properly matched, which may potentially improve soil fertility and promote ecosystem productivity. The soil pH thresholds (T pH ), the point when afforestation changes from increasing to decreasing soil pH, are species-specific, ranging from 5.5 (Pinus koraiensis) to 7.3 (Populus spp.) with a mean of 6.3. We find significant soil pH neutralization by afforestation-afforestation lowers pH in relatively alkaline soil but raises pH in relatively acid soil. Here we investigate the afforestation-caused soil pH changes with pairwise samplings from 549 afforested and 148 control plots in northern China. However, the effect of afforestation on soil pH is still poorly understood and inconclusive. Afforestation has been widely adopted to increase terrestrial carbon sequestration and enhance water and soil preservation. Soil pH regulates soil biogeochemical processes and has cascading effects on terrestrial ecosystem structure and functions. Hong, Songbai Piao, Shilong Chen, Anping Liu, Yongwen Liu, Lingli Peng, Shushi Sardans, Jordi Sun, Yan Peñuelas, Josep Zeng, Hui
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