湿地松×洪都拉斯加勒比松F1杂种的多性状综合评价

根据1块种植于广东省台山市红岭种子园的湿地松×洪都拉斯加勒比松F1杂种测定林的7年生数据，就杂种的生长量、树干通直度、分枝习性与湿地松、加勒比松进行了比较分析。结果表明，F1杂种的生长优势突出，树高、胸径、材积分别为9．18m、14．96cm、0．08645m^3，相对于湿地松、洪都拉斯加勒比松和古巴加勒比松种子园混合种的材积现实增益分别为315．23％、46．35％、114．89％。此外，杂种的树干通直度得分、冠幅、枝角、枝径、枝数分别为1．54分、3．45m、68．93°、1．84am、3．35条，其树干通直度得分与母本湿地松接近而显著低于父本洪都拉斯加勒比松，冠幅和枝径与父本相似而显著大于母本，枝角介于父、母本之间，枝数与父、母本没有显著差异。

Evaluation on Growth,Stem Form,and Branch Habit of Pinus elliottii var.elliottii×P.caribaea var.hondurensis F1 Hybrids

One test plantation including F1 hybrid families of Pinus elliottii var. elliottii x P. caribaea var. hondurensis was established in Taishan Seed Orchard in 1999. All trees in the test were measured at 7 years after planting. The traits measured were height, diameter at breast height （dbh）, stem straightness, crown width, branch angle, branch diameter, branch number. And volume of individual tree was calculated. The analysis results showed that growth vigor from PEE × PCH was significan. The average height, dbh, and volume were 9.18 m, 14.96 cm, 0. 086 45 m^3 ,respectively, and the real gains were 315.23% , 46.35% , 114.89% for volume in comparison with seedlots from P. elliottii vat. elliottii, P. caribaea var. hondurensis and P. caribaea var. caribaea seed orchard. In addition, straightness score, crown width, branch angle, branch diameter, branch number of hybrid were 1.54 point, 3.45 m, 68.93°, 1.84 cm, 3.35 piece, respectively. Straightness score of hybrid was approximated to that of P. elliottii vat. elliottii, but significantly less than that of P. caribaea var. hondurensis. Crown width and branch diameter of hybrid were as large as its paternal species, but significant larger than that of its maternal species. Branch angle of hybrid was in the middle compared to that of its parents. However, there was no significant difference between hybrid and its parents for branch number.