摘要
以浙江省17个无性系种子园为研究对象,连续2年采种育苗造林,进行2次4地点5区组的种子园子代测定试验,测定树高、胸径、材积、冠幅、侧枝等8个性状。结果表明从未经遗传改良普通林分种子到1代、1.5代、2代种子园,子代生长增益是逐代增长的,但世代之间增幅明显下降。优良双系种子园子代生长增益最大,优良种源种子园次之。1代、1.5代和2代种子园,种源种子园,双系种子园的子代生长,在6年生时,树高生长现实增益分别为4.35%、6.04%、7.88%、12.02%和12.02%,遗传增益依次为3.90%、5.41%、7.06%、10.77%和10.77%;胸径现实增益为7.60%、9.68%、12.08%、15.05%和19.70%,遗传增益为7.07%、9.00%、11.23%、14.00%和18.32%;材积现实增益为20.65%、27.47%、32.14%、39.93%和46.14%,遗传增益为16.97%、22.58%、26.42%、32.82%和37.93%。为持续获得高增长的遗传改良效果,在高世代种子园建设中,应充分发掘和优先利用优良种源的优质种质资源;在提升育种群体遗传水平,保持遗传基础多样性的同时,建立双系种子园,实现工业原料林用种的品种化,应是今后的一个重要发展方向。
To fully understand the progress and trend of genetic improvement of Chinese Fir ( Cunninghamia lanceolata ) in seed orchards of different generations and types, and thus search for sustainable and efficient approaches for improving the genetic level of populations in trees, we collected seeds, grew and planted seedlings for two consecutive years in 17 clonal seed orchards in Zhejiang Province. Data on tree height, breast diameter, volume, crown diameter and lateral branch were measured twice in seed orchards of four different locations and five groups. The results showed that the average growth gain of progeny gradually improved from generation to next generation, i.e., from general unimproved seeds to seeds from orchards of the first, one and half, and second generations, however, the growth gain between different generations decreased significantly. The seeds from biclonal seed orchards showed the greatest growth gain, followed by those from provenance orchards. At six-year-old, compared with general unimproved seeds, the seeds from the first, one and half, and second generation orchards, provenance orchards and bi-clonal seed orchard showed height gain of 4.35%, 6.04%, 7.88%, 12.02% and 12.02%, representing genetic gain of 3.90%, 5.41%, 7.06%, 10.77% and 10.77%, respectively; breast diameter gain of 7.60%, 9.68%, 12.08%, 15.05% and 19.70%, representing genetic gain of 7.07%, 9.00%, 11.23%, 14.00% and 18.32%, respectively; and volume gain of 20.65%, 27.47%, 32.14%, 39.93% and 46.14%, representing genetic gain of 16.97%, 22.58%, 26.42% ,32.82% and 37.93%, respectively. Based on these results, we suggest that the seed resources of fine provenances should be utilized to the fullest in advanced orchards in order to achieve sustainable genetic gain. We further suggest that it should be very important to build bi-clonal orchard for trees used for industrial materials while improving the genetic level of populations and maintaining genetic diversity.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2007年第3期20-27,共8页
Scientia Silvae Sinicae
基金
浙江省科技厅"九五"重点项目"杉木良种不同世代
类别种子园遗传改良的研究"(991102339)。
关键词
杉木
种子园
现实增益
遗传增益
子代测验
Chinese Fir( Cunninghamia lanceolata)
seed orchard
realized gain
genetic gain
progeny testing