Table 1.

Methane consumption by forest soils incubated with methane and various ammonium or non-ammonium saltsa

Salt addedbUptake (nmol g [dry wt]−1 h−1) (% of control) in presence of methane atc:
1.7 ppm250 ppm
Expt A
 Controld 0.41 2.69 
 NaCl0.14 (34.5)0.62 (23.2)
 Na2SO4 0.37 (89.5)2.77 (102.7)
 NaH2PO4 0.38 (93.3)2.59 (96.3)
 KCl0.15 (35.5)0.69 (25.8)
 KNO3 0.23 (55.5)1.19 (44.2)
 MgCl2 0.13 (32.4)0.74 (27.6)
Expt B
 Control0.56 4.34 
 NaCl0.30 (53.9)0.50 (11.4)
 NH4Cl0.29 (52.3)0.39 (9.1)
  • a The methane was present at atmospheric concentrations (1.7 ppm) or at 250 ppm. The added salts were present at 1 μmol g (fresh weight)−1 (0.5 μ g−1 for Na2SO4). The total soil water potential for all samples was >−0.01 MPa.

  • b Experiments A and B represent independent assays with similar soils.

  • c Results are means of triplicate determinations.

  • d Controls were treated with a volume of deionized water equal to that used for the salt additions.