Table 1 The condition of simulated karst habitats
Treatment | Reagents | Substance content (mM·L− 1) |
|---|---|---|
Control | – | – |
HCO3− | NaHCO3 | 10 |
nitrate:ammonium | NaNO3/NH4Cl | 1:9 |
nitrate:ammonium | NaNO3/NH4Cl | 5:5 |
nitrate:ammonium | NaNO3/NH4Cl | 9:1 |
Nitrogen removal nutrient solution | Hogland nutrient solution (without nitrate and ammonium) | [2] |
pH | KOH | 8.30 ± 0.05 |
Drought | PEG6000 | 10 g·L−1 |