Studying of spacing and thining effect on Taxodium distichum plantation
2002
Siahi Pour, Zogh Ali | Aman Zadeh, Beyt Ol-Lah | Hemmati, Arsalan | Khanjani, Baba
Bald cypress ( Taxodium distichum (L.) Rich ) known as southern cypress or swamp cypress in native to much of the southeastern U.S. this species is a lofty decidous conifer with height and D.B.H 1-1.7 m and 40 m respectivly . Astady was carried out with this species in Haft – daghanan in Guilan provience . The objective of this study was to determine effects of different distance of planting on growth . The expermental design used is a randomized complecte block design ( Rcbd ) , with 3 replication and 4 planted distance ( 2*1.8 ) ,( 2*2 ) , ( 2*2.5 ) and ( 3*3 ) m . Analyses of variance ( Anova ) were carried out and resould showed that : 1 – There was n&rsquot differences between planted distance and height and D.B.H growth . (p%5) . 2 – Mean anual height and D.b.h in all of trees was 47 cm , 6 mm respectively . 3 – Survival rate after 12 years was 48.5 % . 4 – Mean basal area was 16.28 m² / ha . 5 – Rate of h/d was 77.8 .
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