Study on Biomass and Carbonized Mass of 11 Eucalyptus Clones at age 6-years

The increment,biomass and carbonized mass of 11 Eucalyptus clones at age 6-years were examined from trials on the Leizhou Peninsula.By stand volume the 11 Eucalyptus clones were ranked as follows: GL4GL9DH32-22LH5DH201-2LH1M1EC34E.saligna No.1UC184-1SH7.Stand volume of GL4,the largest of the 11 clones,was 2.1 times that of SH7,the smallest one.The biomass of various organs of the 11 Eucalyptus clones varied markedly;stem mass accounted for the greatest proportion of total biomass while leaf mass accounted for the lowest proportion out of the five organs assessed.Clones LH5 and GL4 had the highest stand biomass of the 11 clones,at 180 t·hm-2,whilst SH7 and UC184-1 had the lowest with less than 130 t·hm-2;stand biomass of other clones were between 140 t·hm-2 and 170 t· hm-2.The carbonized mass of the 11 Eucalyptus clones increased as the stand biomass and carbonization rate increased.Clones LH5,DH2012,LH1 and GL4 all had carbonization rates above 20%— the highest among the 11 clones;clones UC184-1 and SH7 had the lowest carbonization rates.Clone LH5 had the highest carbonized mass of the 11 clones,due to having both the highest stand biomass and highest carbonization rate.Clones GL4 and LH1 also ranked highly by carbonized mass,both being above 60 t·hm-2.The carbonized mass of clones EC34,GL9,E.saligna No.1,M1 and DH32-22 were between 50 and 60 t·hm-2 whilst clone UC184-1 had the lowest carbonized mass with less than 40 t·hm-2.Based on results obtained for growth increment,biomass and carbonized mass,it was concluded that the clones GL4,LH5,GL9 and DH32-22 are the best suited for biomass and fuelwood forest;clones LH1,EC34,DH201-2 and M1 have medium to low suitability for such plantations;and,E.saligna No.1,UC184-1,and SH7 are not suitable for such plantations.