摘要:
测定了黑龙江绥化杨树品种试验林14个无性系12龄的树高Ht、胸径Dt和材积Vt。由胸径处钻取木芯,按2a一段分6个生长轮,研究了生长直径Dr、容重Sg、纤维长Lf、纤维宽Wf、长宽比Lw、纤维(双)壁厚Tf、腔径Df和壁腔比Td的遗传变异和选择。以年龄、无性系综合地进行方差分析,结果表明所有性状在无性系间都有显著差异,最好的比最差的高出106%-20%。Dr、Lf和Lw对年龄直线回归,Sg和Wf对年龄曲线回归。基于小区平均值估井的性状重复力(Rr):Ht 、Dt,和Vt分别为0.85、0.62和0.64;基于无性系平均值估算的重复力(Ro):Sg、wf、Tf和Td都达0.91以上,Dr、Df和Lw达0.86以上,最低的Lf也达0.63,说明这些性状的遗传性都较强。按12龄表型值进行单性状选择,增益最高 (Vt)25.2%,最低(Lf)3.4%,以Vt、Sg、Lw、和Tf6个重要性状进行综合指标选择,选出全面优良的3个无性系,增益高达31.9%。
Abstract:
The 12-year-old tree height (Ht),DBH(Dt) and volume(Vt) of 14 clones from Suihua poplar test plantation in Heilongjiang were examined.Diameter(Dr),specific gravity(Sg),fiber length(Lf),widness(Wf),ratio of Iength to widness(Lw),(double)wall thickness(Tf),lumen diameter (Df)and ratio of wall thickness to lumen diameter (Td) for each 2-year's growth ring of the cores which extracted from sampled trees at breast height from bark to pith were evaluated.Analysis of variance showed significant differences among clones for all traits.The best clone exceeds the worst one by 106%~20%.Reapitabilities calculated on plot mean basis(Rc) for Ht,Dt and Vt are 0.85,0.62 and 0.64 respectively,whereas reapitabilities on clone mean basis (Rc)for sg,Wf,Tr and Td are 0.91 or more,forDr,Df and Lw0.56 or more,for Lf 0.63.The high parameters indicate the strong inheritance of these traits.Dr,Lf and Lw were linearly regressed to age,Sg and Wf were curvely regressed to age.The gains from single trait selection based on 12-year-old's phenotypes were ranged from 25.2% for Vt to 3.4% for Lf.The gain from combined(Vt,sg,Lf,,Wf,and Tf)index selection was as high as 31.9% when the best 3 clones were selected.
.............................................................................,fiberlength(LJ),widness(矶),ratio
ofIengthtowidness(L。),(double)wallthiekness(T,),lumendiameter
(Dz)andratioofwallthieknesstolumendiameter(Td)foreaehZ一year,s
growthringoftheeoreswhiehextraetedfromsanlpledtreesatbreastheight
frombarktopithwereevaluated.Analysisofvarianeeshowedsignifieant
differeneesamongelonesforalltraits.Thebesteloneexceedstheworst
oneby106%~20%.ReaPitabilitiesealeulatedonPlotmeanbasis(R`)forH,,
D,andV,are0.55,0.62and0.64respeetively,whereasreapitabilitieson
elonemeanbasis(R:)fors。,平,,TrandTdare0.91ormore,forDr,DI
andL。0.56ormore,forL,0.63.Thehighparametersindieatethestrong
inheritaneeofthesetraits.刀r,L,andL口werelinearlyregressedtoage,aS
andw,wereeurvelyregressedtoage.Thegainsfromsingletraitseleetion
absedon12一year一old,5phenotypeswererangedfrom25.2%forV,to3.4%
forL,.Thegainfromeombined(F,,s。,石,,万,,石,andT,)indexseleetion
wasashighas31.9%whenthebest3eloneswereseleeled.
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