2.1 Soil Sampling for incubation experiments
Saline-sodic soils for incubation experiments were collected from a
degraded wetland on 4 April 2018 in the Momoge region, Jilin Province,
China. The predominant vegetation cover was Leymus
chinensis (Trin.) Tzvel. with a total vegetative cover of less than
10%. The climatic averages for the year are 4.4 ℃ and a rainfall of 392
mm/y. Surface soils within 40 cm depth were collected and brought back
to the laboratory. Soils were well mixed and passed through a 5 mm sieve
to remove stones before incubation experiments.