Jianyong Wang

Aug 15, 2023 | frontiersin.org | Hui Li |Xin Sui |Jianyong Wang

1. Introduction The western part of the Songnen Plain is located in the northeast of China. It is one of the three major soda-saline soil regions in the world (Yang et al., 2016), with an area of 3.42 × 106 ha (Wang et al., 2003). NaHCO3 and Na2CO3 are the main salts there, with soil pH mostly above 8.5, often ranging between 9.0 and 10.5, which is the characteristic pH value of severe soda-saline land (Chi et al., 2011).