▁a ▁decid uous ▁forest ▁e cor eg ion . ▁ ▁The ▁Q in ▁Mountains ▁form ▁the ▁waters hed ▁between ▁the ▁Y ellow ▁River ▁bas in ▁of ▁northern ▁China , ▁which ▁was ▁histor ically ▁home ▁to ▁decid uous ▁broad leaf ▁for ests , ▁and ▁the ▁Yang zi ▁River ▁bas in ▁of ▁southern ▁China , ▁which ▁has ▁mil der ▁winter s ▁and ▁more ▁ra inf all , ▁and ▁was ▁histor ically ▁home ▁to ▁warm ▁temper ate ▁ever green ▁broad leaf ▁for ests . ▁ ▁The ▁low - e lev ation ▁for ests ▁of ▁the ▁fo oth ills ▁are ▁domin ated ▁by ▁temper ate ▁decid uous ▁trees ▁like ▁o aks ▁( Qu erc us ▁ac ut iss ima , ▁Q . ▁vari abil is ), ▁el m ▁( U l mus ▁s pp .), ▁common ▁wal nut ▁( J ug l ans ▁regia ), ▁map le ▁( A cer ▁s pp .), ▁ash ▁( F ra x inus ▁s pp .) ▁and ▁C elt is ▁s pp . ▁Ever green ▁species ▁of ▁these ▁low - e lev ation ▁for ests ▁include ▁broad leaf ▁ch in qu ap ins ▁( Cast an opsis ▁s cler oph yl la ), ▁ring - cu pped ▁o aks ▁( Qu erc us ▁gla uca ) ▁and ▁con if ers ▁like ▁P inus ▁mass on iana . ▁ ▁At ▁the ▁middle ▁elev ations , ▁con if ers ▁like ▁P inus ▁arm and ii ▁are ▁mixed ▁with ▁broad leaf ▁bir ch ▁( B et ula ▁s pp .) ▁o ak ▁( Qu