Photographs are used to predict productivity at untested locations 

 within the study areas, and ground- truth is collected at these sites 

 during subsequent sampling periods. 



Annual Spartina alterniflora above-ground production ( g dry wt m"^) 

 of a salt marsh in Georgia was determined: 



Infrared Imagery 



End of 

 Season Live 



End of 

 Season Dead 



End of 

 Season Total 



Red 



Light-red 



Blue-red 



Blue 



Marsh Average 



Juncus (net) 



1665 

 630 

 499 

 331 

 781 



913 



301 

 169 

 226 

 57 

 188 



625 



(Gallagher's data as reported by Turner 1976) 



1966 

 799 

 725 

 388 

 969 



1538 



(B.W.) 



Keywords: salt marshes, productivity, remote sensing, biomass, Georgia 



II-B-16 



Williams, R.B. , and 

 alterniflora and 

 North Carolina. 

 12:49. (Abstr.) 



M.B. Murdoch. 1969. Annual production of Spartina 

 Juncus roemerianus in salt marshes near Beaufort, 

 The Association of Southeastern Biologists Bulletin 



The production of organic matter by salt marsh phanerogams, Spartina 

 alterniflora and Juncus roemerianus , was studied in areas near Beaufort, 

 N.C. Living and dead plants were removed from 1 m^ quadrats at 5-week 

 intervals, sorted, dried and weighed. Production was calculated by 

 adding an estimate of the quantity of material produced and lost 

 prior to harvest to the measured standing crop of living plants. In 

 September, the end of the main growing season, standing crops of the 

 live Spartina ranged from 0.25 kg (dry weight)/m in the high marsh 

 to 2.1 kg/m^ in the streamside marsh. Average annual production for 

 Spartina was ca. 1 kg/m^. Both the maximum standing crop and the 

 annual production of Juncus were also ca. 1 kg/m^. From this rate 

 of production and the quantities of dead plant material in the marsh, 

 the daily loss of dead Spartina was estimated to average 1 percent of 

 its total weight, and of dead Juncus , a fraction of 1 percent. (A. A.) 



Keywords: food chain, Spartina alterniflora , Juncus roemerianus , 

 salt marsh. North Carolina 



44 



