不同种源中国马褂木在广西的早期生长表现

对广西3个试验点5个马褂木种源4年生数据进行统计分析。结果表明，3个地点4年生保存率有显著不同，位于桂林全州的咸水试验点（XS）总体保存率较高（88%），而位于南宁北郊的高峰（GF）（70%）、南郊的良凤江（LFJ）试验点相对较差（51%），表明参试种源在桂北具有较好的适应性。地点内不同种源间保存率也有较大差异，总体上云南金平、贵州黎平种源保存率较高。参试种源平均树高、胸径及单株材积在GF与XS试验点生长表现基本相当， LFJ试验点因管理不善整体表现较差。3地点联合方差分析表明，生长性状在种源间有极显著差异(P<0.01)，且地点和种源间存在显著的交互作用(P<0.05)。采种点与试验点的经纬度离差、年均温离差及年均降水量离差与试验点保存率、树高、胸径相关分析表明，经纬度离差与GF、LFJ试验点的保存率有明显的负相关关系，表明桂南试验点（GF、LFJ）对种源的选择性高于桂北试验点(XS)，离试验点地理位置较近的马褂木种源有更高的适应性。根据生长表现和育种值，发现云南金平和福建武夷山种源生长相对较好，均高于广西本地（全州）种源。与广西本地（全州）种源比较，云南金平种源树高、胸径和单株材积遗传增益分别为4.38%、13.23%、30.05%。

Early Growth Performance of Liriodendron chinense from 5 Provenances in Guangxi

Liriodendron chinense from 5 provenances,including Yunnan (YNJP),Guizhou (GZLP),Fujian (FJWJ) and other places was introduced to three sites in Guangxi:Xianshui of Guilin (XS),Gaofeng of Nanning (GF),Liangfengjiang of Nanning (LFJ).The results of 4-year-old trails showed that the survival rates were different among provenances and among test sites.XS region had a high overall preserving rate (88%),followed by GF (70%),while LFJ was relatively poor (51%),indicating that L.chinense was more adaptive to northern Guangxi.In general,higher preserving rates were found in the provenances of YNJP and GZLP within the same introduction site.The average tree height (H),diameter at breast height (DBH) and individual tree volume (V) of five provenances presented excellent growth performance both at GF and XS test sites,while the poor growth was found in LFJ where the management at early stage of plantation was poor.A joint analysis of variance was carried out on the growth of five provenances based on three different sites.Significant difference was observed in growth trait (H,DBH and V) among different provenances (P<0.01),and a significant interaction was also detected between the test sites and the provenances (P<0.05).A significant negative correlation between latitude and longitude deviation and the survival rate of GF and LFJ test sites implied that there was relatively higher selection pressure for L.chinense provenances in southern Guangxi.According to the growth performance and breeding value,the study also found that the growth of YNJP and FJWY provenances was better than that of Guangxi local provenance (GXQZ) at all test sites.Compared with local provenance (GXQZ),the genetic gains on H,DBH,and V of YNJP provenance were 4.38%,13.23% and 30.05%,respectively.