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. 2021 Aug 13;16(2):412–422. doi: 10.1038/s41396-021-01079-6

Table 1.

Physiochemical and biological properties of soils.

Soil Solonetz Farmland
Exchangeable sodium percentage (ESP, %) 26.9*** 0.511
Exchangeable Na+ (ENa, cmolc·kg−1) 20.8*** 0.376
Soil pH 9.64*** 7.76
Soil bulk density (SBD, g·cm−3) 1.38** 1.24
HCO3− (mmol·L−1) 3.94** 1.36
CO32− (mmol·L−1) 6.79*** 0.00
Microbial biomass carbon (MBC, mg·kg−1) 62.8 194***
Microbial biomass nitrogen (MBN, mg·kg−1) 19.4 29.1**
MBC/MBN 3.26 6.70***
Cation exchange capacity (CEC, cmolc·kg−1) 77.2** 73.4
Total carbon (TC, mg·g−1) 13.6 13.5
Total nitrogen (TN, mg·g−1) 0.393 0.872***
TC/TN 34.7*** 15.5
Available phosphorus (AP, g·kg−1) 6.57 25.5***
Available potassium (AK, mg·kg−1) 171** 155
Archaeal amoA gene abundance (106 copies g−1) 3.35 495***
Bacterial amoA gene abundance (107 copies g−1) 17.0 330***
Nitrification potential (NP, μg N g−1 day−1) 23.5* 17.1

Significance levels are *p < 0.05, **p < 0.01, and ***p < 0.001.