135 
rag Ay N OF SAND PLAINS 
1910} HOW E—REFORESTATIO 
which surrounded the field. White bunk sells ee 
Spiraea tomentosa now occupy the field at the rate of 53 see = ete 
tively per square meter. A stand of pitch pine 16 — : es 
63 trees on 25°¢™ came into existence in the same ee Nagas 
plot in this stand is given below (fig. 4). The oaks 
] i | 
t PR | . i 
Po | agecenaees 
t—++—++— +s e 
an8 
ooo : 7 
a oe oe ee ee 7 H- HA 
‘oe Ss SS Tes } o 7 
2RE BER AM EE Ss 
——} 
SSS RERRe eee 5 — 
PPPrer rer ttt ae 
am WL x 
Ske /Saine fs r 
one ee 
pees tabaae in 
BAR ee Be wu iM 
CALC PR 
ee 
maton tT Tatwiw, ft 2 
eS oie Oo 1 iw ‘ie Re 
saun a . 4 \ mA 
Pal a b———p>_# _| 
0&8 OG @ Bw 
SESS 00SEeeeee 
SUG Gaeegg 
Poe 
CET wi " 
SCG GSRBR Be aaH a 2 SSe se See eee 
Se ee 
it PR 
- anne at Oe Eat Mie 
scinseee my 
CC) saat : 
Be : 
aUgaa Se ESan 
eae 
HHH kas ee as) aane 
Sue Somee GED ; rrr 
Bens ease 
Perr “ 
+ 
Rae | : : 
EES 
Rieag 
Litt 3 
Fic 
ved field, 
4.—Sample plot 16. Pitch pine 16 years old, on arpa mst . 
Colchester plain, 5 square meters; PR, Pinus rigida s i‘; = - 
velutina 3; ML, M elampyrum lineare; M, Myrica asplenij 
h and 
years old. Other dense even-aged stands of Be IE on 
pitch pine probably had a similar origin, although the history 
inception is not actually known. haracter 
2. SUCCESSION LACKING THE SOD-FORMING sere 7 
of the vegetation on a plowed field the first year a eens 
apparently depends upon the kind of weed seeds in the 
