Table 1. Soil redox potentials (Eh) (mV) and interstitial water pH, sulfide (mM) and NH 4 (ppm) 

 concentrations measured in Spartina patens sods placed equal with (disturbed control (DC) and 

 undisturbed control (UC)) or 10 cm below marsh surface in the donor marsh and at three 

 elevations (equal to, 10 cm above, or 10 cm below surface) in the recipient marsh after one 

 growing season (n = 5). 



Donor marsh 



-10 cm DC (=) 



UC(=) 



-10 cm 



Recipient marsh 



+ 10 cm 



Eh (1 cm) -5 ±41 -58 ± 34 9 ± 46 -134 ± 21 



Eh (10 cm) -92 ± 42 -33 ±38 -80 ± 29 -160 ± 7 



pH 7.1 ± 0.1 7.1 ± 0.1 6.8 ± 0.0 7.1 ± 0.1 



38 ±39 109 ± 34 



-120 ± 16 -104 ± 34 

 6.9 ± 0.3 6.5 ± 0.3 



Sulfide 0.34 ± 0.12 0.02 ± 0.01 0.01 ± 0.00 2.10 ± 0.61 0.01 ± 0.01 0.01 ± 0.01 

 NH 4 -N 1.6 ± 0.34 0.6 ± 0.1 0.8 ± 0.2 8.3 ± 1.3 0.4 ± 0.1 0.5 ± 0.2 



Table 2. Soil redox potentials (Eh) (raV) and interstitial water salinity (ppt), pH, sulfide (mM), 

 and NH 4 -N (ppm) concentrations measured in control (healthy marsh) and treatment (dieback 

 marsh) sods placed at two elevations (equivalent with or 10 cm above the dieback marsh surface) 

 at a brackish marsh site (n = 5). Sods contained either Spartina altemiflora or S. patens. 



Variable 



Control 



Dieback 

 (=) 



Dieback 

 ( + 10 cm) 



Spartina patens sods 



Eh (1 cm) 



Eh (15 cm) 



Sulfide 



Salinity 



pH 



NH A -N 



Spartina altemiflora sods 



Eh (1 cm) 



Eh (15 cm) 



Sulfide 



Salinity 



pH 



NH 4 -N 



360 



