Abstract
Effects of salinities other than NaCl-dominated on soil respiration have been rarely studied. We investigated interactive effect of alkalized magnesic salinity and substrate availability on soil respiration. Topsoil samples (S1, S2, S3, and S4, with total soluble salts 1.4, 24.7, 43.7, and 88.6 g kg−1, respectively) were amended without or with glucose or plant residues and incubated in the dark for 62 days at 28°C. Under no organic addition, respiration rate of saline soils (S2–S4) was suppressed in the first 2 weeks, unaffected in the following 4 weeks but stimulated in the remaining 3 weeks, compared to non-saline soil (S1). This shift from the negative to the positive effect of salinity lagged under glucose and lagged more under residue addition, compared to no organic addition. By the end of incubation, cumulative CO2–C evolution from soils was unaffected by salinity under no organic amendment. On the contrary, cumulative CO2–C evolution was higher from S2 and S3 but lower from S4 than from S1 under glucose addition, and it was higher from S2 but lower from S3 and S4 than from S1 under plant residue addition. We concluded that the alkalized magnesic salinity effect on soil respiration changes with substrate availability and incubation time.
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