Comparison of recovered quadrats with quadrats that failed to recover, 

 using site 1 quadrats that were buried by less than 22 centimeters of sand, 

 showed that burial recovery for Spartina. alternifiora is related to initial 

 (preoverwash) elevation, Initial cover and density of Spartina alterni flora, 

 and final cover and density of Spartina patens in the sane quadrats (Fig3. 67 

 to 75). Using all quadrats with Spartina alternifiora chat received less than 

 22 centimeters of sand burial, there is no linear relationship between burial 

 depth and final cover, initial and final cover, or initial and final density. 

 In 1977 the magnitude cf cover and density of Spartina alternifiora was highly 

 correlated with elevation, lut in 1978 no such correlation vas found. 



A review of the elevation data for quadrat? containing Spartina alter- 

 nifiora at site 1 in 1977 and 1978 appears in Figure 76. In both 1977 and 

 1978, Spartina alcerniflora cover and density were highly correlated (1977, 

 r - 0.837, P < 0.01; 1978, r = 0.807, P < 0.01). A comparison of the two 

 regression lines, using a t-test, showed that the slopes of the regression 

 lines are highly signif icancly different (P < 0.01). Multiple regression 

 analysis was unsuccessfully used in an attempt to develop a predictive model 

 for Spartina alternifiora recovery from overwash burial. 



m 







u 

























2 *m 







n 



® 



3 



0-20 21-40 41-60 61-80 



Initial cover value (pet) 



Failed Co recover from overwash buria 

 x » 3 pet cover (57 cases) 



Recovered from overwash burial, 

 x ■ 47 pet cover (74 cases) 



Kruskal-Wallis test results: The rank mean 

 for quadrats In which plants did not recover 

 from burial does differ significantly from 

 the rank mean for quadrats in which plants 

 did recover (P < 0.01). 



Figure 67 , 



Comparisons of initial cover values for quadrats of Spartina 

 alternifiora that recovered and failed to recover from burial. 



•A **1 



Failed 

 burial. 



recover from o-'erwash 

 ; » 5 plants (57 cases) 



Recovered froa overwash burial, 

 x " 72 plants (74 cases) 



IS! 



% V 



n , q 



0-25 26-50 51-75 76-100 101-125 >i25 



Imtiol density (Wo. of tillers par Quodrot) 



Kruskal-Wallis test results: The rank mean 

 for quadrats in which plants did not recover 

 from burial does differ significantly fron 

 the rank mean for quad-ats in which plants 

 did recover (P < 0.01). 



Figure 68. Comparisons of initial density values for quadrats of Spar- 

 tina alternifiora that recovered and failed to recover from 

 overwash burial. 



113 



7- -— 



