Study On The Young Eucalyptus Camaldulensis Forest About Wind Resistance Between The Different Provenance And The Family

E.camaldulensis is a important timber species and all around green trees in southern China, wind damage is common natural disasters in coastal areas. This article select Australian E.camaldulensis provenance 10 family and India provenance 21 family 1-2 years old stand for the study, on the level of wind damage trees, growth, pilodyn value, wood density and wood fiber morphology investigation determined. Research on E.camaldulensis different provenances family wind damage indicators and the determination of the relationship between the factors aimed at screening out wind of E.camaldulensis family. Main research results as follow:①1 year old E.camaldulensis young forest of wind damage rate is generally low, no significant differences between provenances and families.2-year-old stand wind damage rate occurs between provenance and family lineage, and in Australia provenance of wind resistance than India provenance,2-year-old stand provenance average wind damage rate was 7.34% in Australia,8.45% in India, family CA5 is the lowest wind damage from different Australia family for 0.625%, the three number of high wind damage are from family India, witch CO3, CO69, CO50, their wind damage rate above 15%.② Correlation analysis of family wind damage rate and the corresponding tree measurement factor (height, diameter, high aspect ratio, crown) we can see, two years old E.camaldulensis young forest tree height and wind damage rate was significantly. It means that the relation among size% high and wind damage of Eucalyptus are closely. E.camaldulensis is closely related to high DBH, standing mainly determined by the size of tree height and diameter. So E.camaldulensis grow higher, but also that DBH grow bigger, more difficult lodging occur. It indicates the size of the short-term but also affect E.camaldulensis wind damage another important factor in short time.③ Different family of E.camaldulensis wind damage rate and wood density, pilodyn value correlation analysis showed that the relationship between a young forest-year-old E.camaldulensis wind damage rate and pilodyn value significantly, the relationship between wood density and not significant,2 years old E.camaldulensis between young forest wind damage rate and pilodyn value and wood density was not significant.④ Different family correlation analysis of E.camaldulensis between wood fiber morphology and wind damage rate, the results show that there is no correlation correlation between the E.camaldulensis wind resistance and fiber morphology in one year old, but there is some correlation between the E.camaldulensis wind resistance and fiber morphology in two years old, which correlated with the fiber width wind damage rate significantly. Thereby establishing a linear regression equation between wind damage rate and fiber morphology:the wind damage rate (y)=-465.860-753.146X1+17.882X2+ 20.043X3 (X1 fiber length, X2 and X3 representative on behalf of fiber width fiber length and width ratio).⑤ Using principal component analysis and cluster analysis can be classify the 31 E.camaldulensis families into five categories, Class I family include:CO34, CO24, Ca10, CO43, CO10, CO40, CA5, CO53, CO35, CO17, Ca9, CO81, CA18, Ca3, CO68, Cal; Type Ⅱ family includes CO3, CO69; Class Ⅲ family includes CA4, CO48, CO45, CO38, CA15, CO 16, Ca2, CA17, CO36; Class IV family includes CO 19, CO70, CO50; V first class family only CO73. Class I family is basically the best growth, but also the wind resistance good family; wind damage rate is the worst in the presence of family basic category Ⅳ and V class.(6) In E.camaldulensis family heritability comparative study, the results showed a low level of wind damage-year-old E.camaldulensis heritability for 0.405,2 years old E.camaldulensis wind damage grade higher heritability for 0.771; 1-year and 2-year-old red Eucalyptus growth Increment index heritability was high, can reach about 0.7. Description camaldulensis 2 years old young forest growth data and wind damage have shown a high level of genetic stability.Screened by studying genetic stability,the stronger wind resistance are family CA5, Ca10, provide the basis for the selection of tree species for wind resistance.