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"#$%&'()*+"#,-./()0 &'1)23 4ῌ563 789:;<=>?@AB@563 CDEB 563 FGHIJ"K"L"-;)M;)0 N"O-P2<QR"S-T0U῎῍῏ῌV +W XY Z [,**,W 78F9"\]"HIῌI^_`a;<b cdI^ /- : ,,ῌ-*. ,W Hefg [+33+W 78"hijBCkb cdI^ ,+ : ,ῌ+,. -W lmno [+33+W cdIpqrst"uv6w78xeyzt"{|}~wb "b .W Fujita, W., Sukwong, S. and Ogino, K. (,**,) Why do they plant trees?
-Wana Kaset Agroforestry Practice in Eastern Thailand and People’s Strategy.
TROPICS ++ : +03ῌ+2/. /W Khemchalerm, W. (+322) Forest Agriculture : New options for Thai agriculture. Seri Phongphit and Robert Bennoun  , Turning Point ofThai Farmers. +.1ῌ+//. Moo Ban Press. Bangkok, Thai 0W  [+33-W 78
iyyzb b 1W H  [,**-W cd"I [,/W D@7@
[sentangWb cdI^ /2 : /0ῌ0+. 2W l  [,***W   ""12L w 78"_ w  ῌ  kC¡¢£t /3 : +31 ῌ ,,+. 3W
Hozumi, K. (+31/) Studies on the frequency distribution of the weight of individual
trees in a forest stand. V. The M-w diagram for various types of forest stands.
Japanese Journal of Ecology. ,/ : +,-ῌ+-+.

c d I ^ No. /3 ῍,**.῎69