Overwash burial of low-lying dunes was limited on Nauset Spit-Eastham in 

 1978; it was a more common occurrence in areas with very young s accreting 

 dunes, such as the southern end of North Beach in Chatham. Embryonic dunes 

 developing in drift lines and dunes developing as a result of Ammophila 

 breviligulata rhizome extensior. from an established dune field are subject to 

 nonerosive, limited overwash burial. Overwash probably plays a significant 

 role in the early development of vegetated dunes in the northeast by providing 

 large, instantaneous supplies of sand which increase the rate of initial dune 

 development. 



(b) Artemisia st elleriana . A total of 77 quadrats with Arte- 

 misia stelleriana were buried by between 5 and 59 centimeters of waehover 

 sand. A total of 31 quadrats (40 percent) recovered from as much as 59 centi- 

 meters of burial; 46 quadrats failed to recover from burial (Table 25). 



Comparisons of quadrats that recovered to th -se that failed to recover, 

 using the Kruskal-Wallis test, showed that bur:.*L recovery is related to 

 initial cover and initial density, but not to bursal depth (Figs. 46, 47, and 

 48). The greatest burial of Artemisia stellerianx was 59 centimeters, and the 

 plants in this quadrat recovered. Seventy-five percent of the quadrat3 (IE) 

 with less than 10-percent cover failed to recover from burial. Eighty-eight 

 percent of the quadrats (14) with fewer than 10 plants per 50 square centi- 

 meters failed to recover. There is no correlation between either initial and 

 final cover or initial and final density. Multiple linear regression was used 

 to relate burial depth and initial cover to final cover. Final cover can be 

 predicted using initial cover and burial dep'.h (r = 0.493, P < 0.02). 



1 



1M 



Failed Co recover from overwash 

 burial, x - 17.0 pet (46 cases) 



□ Recovered froa overvash. burial. 

 x - 29.0 pet (31 cases) 



ilikrMj 



Figure 46, 



10-19 '20-ZS 30-39 40-49 



imtioi cover value ( pet) 



Kruskal-Wallis test results: The rank itsan 

 for quadrats In which plants did not recover 

 from burial doe9 differ significantly from 

 the rank mean for quadrat3 in which plants 

 did recover (P < 0.01). 



Comparisons of initial cover values for quadrats of Artemisia 

 stelleriana that recovered and failed to recover from burial. 



"M 



,„i '■ 



u 



f ; "3 Failed to recover fron overwash burial. 

 "^ ic - 33.1 plants par 50 en" 1 (46 cases) 



Y~\ Recovered froa overwash burial. 

 ^"^ x - 49.3 plants per 50 cm 2 

 (31 cases) 



m 



II 



/ 



wx 



Figure 47. 



Kruskal-Wallis test results: The rank Bean 

 for quadrats In which plants did not recover 

 from burial does differ significantly iron 

 the rank mean for quad its in which plants 

 did revover (p < 0.C1). 



Comparisons of initial density for quadrats of Artemisia 

 stelleriana that recovered and failed to recover from burial. 



» 20-39 40-59 



Initial density (No. of oses per quadrat) 



98 



V 



