100 200 300 400 500 100 200 300 400 500 



Number of Passes 



Figure 21 — Relative vegetation height after trampling 

 and after 1 year of recovery in four vegetation types in 

 New Hampshire's White Mountains. Vertical bars rep- 

 resent 1 standard error above and below the mean. 



(A) 

 20- 



15- 



10- 



0) 



c 



Carex bigelowii 



□ Before trampling 

 H After trampling 

 After 1 year 



(B) Leersia oryzoides 



^ 5- 



W 

 V 



o 

 o. 



"g (C) Lycopodium lucidulum 



5 20 

 Si 



1.51 



Z 



10- 



5- 



(D) Maianthemum canadensis 



25 75 200 500 



Number of Passes 



75 200 500 



Figure 22 — Species richness before and after trampling 

 and after 1 year of recovery in four vegetation types in 

 New Hampshire's White Mountains. Vertical bars repre- 

 sent 1 standard error above the mean. 



31 



