湿地松种源生长量、材性的变异与优良种源综合选择

对湖北省荆州市林业科学研究所湿地松种源试验林的生长量及材性进行了研究，结果表明：湿地松种源间的树高、胸径、材积等生长量因子以及晚材率和木材基本密度均存在着显著差异，且具有中等程度的广义遗传力。基本密度径向变异模式以及递增为主，年轮段基本密度呈正态分布。木材密度早晚期相关性随树龄增大而增加，用5年生木材密度能可靠地预测12年生木材密度。各种源生长量因子与木材基本密度相关性有正有负，相关性大小与种源有关。木材密度与晚材率的正相关显著。生长量、木材密度与原产地地理、气候因子相关不显著；晚材率与纬度正相关，与年均温负相关显著。综合评估表明S1，S3、S20为较优种源。

Variation Analyses of Tree Growth and Wood Properties among Slash Pine Provenances and Comprehensive Selection of Superior Provenance

year-old tree growth traits of 17 slash pine provenance's stands planted in Jingzhou districts of Hubei Province and their wood properties were studied in this paper. The distinct differences in trees height, diameter at breast height, trees volume, wood basic density and latewood percent were found among provenances. Their broad heritabilites range from 0.434 to 0.681. There are four radial variation patterns of basic density within slash pine trees, but the main pattern is a steadily increasing trend from pith to bark. The value of basic density in 5-year-old trees can be used to predict that in 12-year-old trees. The relationship of wood basic density to trees height, diameter at breast height and trees volume within a given provenance are not specific and correlated with the provenance. Wood basic density is clearly related to late wood percent. Late wood percent is markedly positive related to the latitude of local provenance of slash pine and clearly negative to the annual temperature. Finally S 1, S 3, S 20 were selected to be superior provenances of slash pine from both tree growth increments and wood properties.