红锥不同无性系嫁接效果初探

Preliminary Study on the Grafting Effect of Different Clones of Castanopsis hystrix

通过对41个红锥无性系嫁接1a后的树体生长调查研究,了解不同红锥无性系的主要生长性状差异及变异规律,并为试验区初选适生的优良无性系。结果表明:红锥各无性系抽梢为3.0cm~66.0cm、冠幅为5cm~45cm、基径为2.80mm~16.45mm,冠幅的变异系数41.78%>抽梢36.56%>基径27.36%。个体无性系抽梢、冠幅、基径均值大于群体均值,无性系个数分别为22个、20个、20个,占比分别为53.7%、48.8%、48.8%。永安洪田镇忠洛村子代测定林的入选率最高,为36.4%,表明这些无性系在该试验条件下具有较高的生长率;红锥41个不同无性系之间生长性状差异显著,3个性状估计的重复力T检验显著,有选择的必要和可能。3个性状的重复力分别为0.62、0.76、0.48,属于中等及以上重复力性状,以抽梢性状为标准并按20%入选率初选出8个无性系充实红锥育种群体。

By investigating the growth of 41 Castanopsis hystrix clones after 1 year of grafting,the differences and variation patterns of main growth traits among different Castanopsis hystrix clones were understood,and excellent clones suitable for growth were selected for the experimental area.The results showed that the height of each clone of Castanopsis hystrix was 3.0cm-60.0cm,the crown diameter was 5cm-45cm,and the basal diameter was 2.80mm-16.45mm.The coefficient of variation of crown diameter was 41.78%,the height was 36.56%,and the basal diameter was 27.36%.There are 22,20,and 20 clones with slightly higher crown diameter and basal diameter than the population average,accounting for 53.7%,48.8%,and 48.8%,respectively.The selection rate of substitute forest in Zhongluo Village,Hongtian Town,Yong'an is the highest at 36.4%,indicating that these clones have high growth efficiency under the experimental conditions;There is a significant difference in growth traits among 41 different clones of Castanopsis hystrix,and the repeatability T-test for the estimation of the three traits is significant,indicating the necessity and possibility of selection.The repeatability of the three traits is 0.62,0.76,and 0.48,respectively,belonging to moderate or above repeatability traits.Based on the slightly higher trait as the standard and with a 20%selection rate,8 clones were initially selected to enrich the Castanopsis hystrix breeding population.