Growth pattern off established quackgrass (Agropyron repens L. Beauv.) plants
その他（別言語等）
のタイトル
シバムギ個体の生長様式
著者（英） Maruyama Junkoh, Fukunaga Kazuo, Yanagisawa Junji
journal or
publication title
Research bulletin of Obihiro University.
Natural science
volume 18
number 2
page range 83‑87
year 1993‑06‑25
URL http://id.nii.ac.jp/1588/00001965/
R
田B u l l .O b i h i r o U n i v . ， 1 8 β 虫 9 3 ) : 品 3‑87
Growth pattern of established quackgrass
( A g r o p y r o n r e p e n s L . Beauv.) plants
Junkoh MARUYAMA" Kazuo FUKUNAGA' and J u n j i YANAGISAWA'
( R e c e i v e d : N ovemver 3 0 ， 1 9 9 2 )
Abstract
The g r o w t h p a t t e r n i n t h e f i r s t y e a r o f quackg
四 回(Ag
叩I p y r o nr e t e n s L . B e a u v . ) p l a n t s r a i s e d from p i e c e s o f r h i z o m e f o r m e d i n t h e p r e c e d i n g y e a r was o b s e r v e d u n d e r n a t u r a l c o n d i t i o n s ， from e a r l y J u n e t o e a r l y O c t o b e r 1 9 8 0 . I t was c o n s i d e r e d t h a t t h e g r o w t h p e r i o d o f 出 ef i r s t p h a s e o b s e r v e d i n t h i s e x p e r i m e n t c o r r e s p o n d s t o 出 ep e r i o d o f c o m p l e t i o n o f f u n d a m e n t a l a r r a n g e m e n t f o r a l l o w i n g e a c h p l a n t t o become e s t a b l i s h e d i n a h a b i t a t t h r o u g h t h e g r o w t h o f a main s t e m ， r h i z o m e s ， a n d a p r i m a r y t i l l e r i n o r d e r t o i n v a d e a p e r i p h e r a l r e g i o n
I n t h e g r o w t h p e r i o d o f t h e s e c o n d p h a s e ， r h i z o m e s r e s u l t i n g from p r i m a r y ， s e c o n d a r y a n d t e r t i a r y t i l l e r s were r e p l e n i s h e d and l i n e a r i n v a s i o n was c o n t i n u e d a l o n g w i t h t h e r h i z o m e o r i g i n a t i n g from t h e f i r s t p h a s e .
F u r t h e r m o r e ， i t was c o n s i d e r e d t h a t t h e r h i z o m e s h a v i n g t h e new s h o o t f o r m e d a t t h e l e a d i n g e n d t h e r e o f a l l o w r h i z o m e b r a n c h e s t o e l o n g a t e and t o c o n v e r t t h e l i n e a r i n v a t i o n d u e t o r h i z o m e s o r i g i n a t i n g from t h e s h o o t t o p l a n a r i n v a s i o n ， which becomes t h e f o u n d a t i o n f o r f o r m i n g a q u a c k g r a s s community f o r t h e f o l l o w i n g y e a r
Key w o r d s : Agropyron
r~ψe出，Weeds ， Growth p a t t e r n
8 3
Introduction
Q u a c k g r a s s i s a s e r i o u s weed p r o b l e m i n n o r t h e r n humid r e g i o n s a r o u n d t h e w o r l d where i t r e a d i l y s p r e a d s by means o f rhizomes
1•叩
f i r s t y e a r a f t e r i n v a s i o n i n t o a new h a b i t a t The o b j e c t i v e o f t h i s e x p e r i m e n t was t o i n v e s t i g a t e t h e g r o w t h p a t t e r n d u r i n g t h e f i r s t y e a r o f q u a c k g r a s s p l a n t s r a i s e d from r h i z o m e p i e c e s f o r m e d i n t h e p r e c e d i n g y e a r .
F o r weed c o n t r o l ， i t i s n e c e s s a r y t h a t t h e m o r p h o l o g i c a l and p h y s i o l o g i c a l c h a r a c t e r i s ‑ t i c s o f weeds b e u n d e r s t o o d and t h a t t h e e c o l o g i c a l l i f e h i s t o r y t h e r e o f b e c 1 a r i f i e d E s p e c i a l l y ， i n p e r e n n i a l weeds ， t h e f o u n d a t i o n f o r e s t a b l i s h i n g and m a i n t a i n i n g a l o n g ‑ t e r m p r e s e n c e i s a f f e c t e d by t h e g r o w t h d u r i n g t h e
Methods
The r h i z o m e s o f q u a c k g r a s s p l a n t s f o r m e d m 白 ep r e c e d i n g y e a r ( 1 9 7 9 ) were c o l l e c t e d from t h e e x p e r i m e n t a l f i e l d o f O b i h i r o U n i v e r s i t y a f t e r snow m e l t e d i n t h e s p r i n g o f 1 9 8 0 . These r h i z o m e s were c u t i n t o p i e c e s a b o u t 4 cm i n
1
