摘要
１０年生火炬松３１个种源间木材抗弯弹性模量（ＭＯＥ）、抗弯强度（ＭＯＲ）存在着显著的差异，二者的广义遗传力分别为０．５９６７、０．６３６４。方差分析中环境方差分量所占比例较大（近５０％），说明ＭＯＥ、ＭＯＲ除受遗传上中等程度控制外，还显著受到环境条件影响。种源内ＭＯＥ、ＭＯＲ变异系数远大于种源间变异，说明火炬松材质改良在种源选择的基础上进行个体改良效果较好。各种源内ＭＯＥ，ＭＯＲ间线性相关显著，３１个种源样木汇总分析其线性模型相关极为显著（ｒ＝０．８７２５＞ｒ０．００１＝０．１８４３）。火炬松幼龄材力学性能劣于成熟材，其ＭＯＥ、ＭＯＲ分别较成熟材低３９．１％、２８．９％。原产地纬度与ＭＯＲ、ＭＯＥ高度正相关，显示高纬度种源引种到低纬度地区种植其抗弯性能变优。靠近墨西哥湾南部地区各种源产地经度与ＭＯＥ、ＭＯＲ高度相关，进一步分析表明南部种源区在纬度相差小于３°情况下，远离海岸线高经度区种源引种到低经度近海岸区种植，其ＭＯＥ、ＭＯＲ有增大的趋势。
Modulus of elasticity(MOE)and modulus of rupture(MOR)varied markedly among 31 loblolly pine(Pinus teada L. )provenances of a decade years old,Their broad sense heritabilities were 0.5967 and 0.6364 respectively,according to variance analyses.Environment factor accounted for 54.29%and 49.77%,in order. Consequently,apart from a medium level of genetic control,MOE and MOR were also affected by growing environment.Variation degree of MOE and MOR within a given provenance were greater than that among provenances. This indicated that single tree selection within a provenance on the basis of selection among provenances is beneficial to the tree quality. Within each of the 31 provenances,MOR was linearly correlated with MOE. Juvenile wood had worse mechanical properties than mature wood.Its MOR and MOE were respectively 28.9%and 39. 1%,both lower than mature wood's. Latitudes of local provenances were very positive to both MOE and MOR. Provenances introduced from higher latitude region,when planted in lower latitude region,helped increase their MOR and MOE. Near Mexico Gulf,longtitudes of local south provenances were in consistence with their MOR and MOE;Provenances far from east coast,when introduced to near east coast,would increase their MOR and MOE if the latitude difference between the two place was less than 3°. Therefore,this geographic variance should be stressed in tree improvenment.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1996年第1期79-85,共7页
Journal of Huazhong Agricultural University
基金
国家"八五″攻关项目
国际科学基金
关键词
火炬松
种源
抗弯性能
幼龄材
遗传变异
Pinus teada L. provenances,flexural properties,juvenile wood,genetic variation
