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Poplar-Bircl1forestistl1eco111l1lunitywhlchiscolllposedmainlyofpop-lar(PoPoIusdari'Idia,Ia)andbircl1(BeIItlapjalofla).Bothpplarandbircharethepio-neerspeciesandpossessbroadsuitability.highseedyquantity,strongsproutabilltyandfastgrowtl1character.PopIarandbrcl1canfor111derivedcoml11unitybothinthemountainouslarchneedle-IeavedfOrestandneedle-leaveevergreenforestoffrigid-temP6ratezol1ea11dil1decid[1ousbroad-leavedfOrestof11orther11te111peratezoneandsubtropicalzone.Itcanalsofor111secondarycoml1… 相似文献
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