尾细桉无性系在雷州半岛的适应性及稳定性评价

Adaptability and Stabilization Analysis of Eucalyptus urophylla × E. tereticornis Clones in Leizhou Peninsula of China

对5年生42个尾细桉无性系（含对照）在国营雷州林业局的年均材积生长量进行适应性及稳定性分析，结果表明：12个无性系具有显著或极显著正向增益，正向增益在10．25％～38．48％之间；适应性评价出适应品种15个，其中唐家林场5个，北坡林场4个，石岭林场6个；稳定性评价出高产稳定型无性系19个，高产不稳定型无性系5个，低产稳定型无性系7个及低产不稳定型无性系11个；3．01、LL244号无性系在好的立地上生长快，LH5和12246号在各类立地上均生长迅速，具较高生产力，生长稳定，评价结果对优良无性系选育及推广具有实际意义。

Adaptability and stabilization analysis including 42 clones of E. urophylla × E. tereticornis was studied at 3 different forest farms of Leizhou Forest Bureau at 5 years old according to the MAI value. The results indicated that： The genetic gains of 12 clones in 42 reach 10.25 -38.48% with remarkable positive gains; there are 15 clones to suit the site of 3 forest farms including of 5 in Tangjia, 4 in Beipo and 6 in Shiling according to the adaptability analysis, respectively ; 42 clones could be classified into 4 groups that had been named high-yeild and sta- ble-growing group including of 19 clones, high-yeild and unstable-growing group including of 5 clones, low-yeild and stable-growing group in- cluding of 7 clones, low-yeild and unstable-growing group including of 11 clones; the LH5 and LL246 clones can grow very fast in different sites with excellent suitability, but the A01 and LL244 can grow very fast in good sites, only; the assessment effect can be used in next step research for continuous clones selection and generalization.