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从西南桦分布区内选择的13个种源在南亚热带山地进行筛选试验的结果表明:不同种源在生长、产量、形态 特征上都有很大差异。以胸径、树高、材积和干形等为指标,用坐标综合评定方法对13个不同种源进行综合评定, 结果表明:潞西、屏边和镇源3个种源生长和形态等各种特征都比其它种源好,位列前3名,是当地适生的好种源; 西马、龙陵和百色种源表现较好,属可利用种源;腾冲和西莲种源表现差,不好利用;平果、凭祥、靖西、景洪和田林5 种源表现一般,最好不发展。 相似文献
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《绿色科技》2016,(17)
通过对4年生西南桦25个种源试验林的生长观测及统计分析,结果表明:西南桦种源试验林的造林成活率比较高,平均达93%,4年生的平均保存率仍有83.0%,经方差分析结果显示种源间的成活率和保存率达显著或极显著差异;生长性状方差分析结果说明,不同年龄的胸径、树高、单株材积和蓄积量在种源间均存在显著或极显著差异;从树高、胸径、单株材积和蓄积量的综合分析比较结果看出,云南的屏边、西畴、元阳、江城和广西的凌云、靖西、那坡、百色、田林、苹果等10个种源生长表现良好,可初步定为适合试验区生长的优良种源,为今后引种的重点;勐腊、镇沅、景谷、风庆、双江、东兰和德保共7个种源生长最差,在没有进一步开展其它种源试验以前不宜扩大引种栽培。 相似文献
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试验从1981年开始,以美国南部的10个火炬松和9个湿地松种源为主试材,福建、江苏两松和当地马尾松种籽作对照,进行了种籽品质、发芽率测定、造林成活率、生长节律、适应性和抗性、种源间生长差异等项研究。结论:在予南低山丘陵区,两松除佛罗里达州种源有轻度冻害外,一般都能适应当地气候;初步认定阿拉巴马、北卡、德克萨斯是火炬松最佳种源,福建南屿是湿地松最佳种源;豫南应以选用火炬松为主,在光照充足的浅山丘陵区两松可同时发展。 相似文献
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收集油松分布区范围内的种源 4 5个 ,经两次全分布区及局部分布区历时 1 8年试验结果表明 ,种源间生长和适应性状差异显著 ,种源与立地存在一定的交互作用 ,种源高生长与年龄、冠幅呈极显著的正相关。据 1 7个变量的主分量分析 ,参试种源分为速生型、中生型和慢生型 3类 ,黄陵、洛南、南召 3个最优种源平均树高、胸径和材积的遗传增益分别为 6 5%、1 0 2 %和 2 6 4%,增产效益显著。陕西、河南一带的种源适应性强、生长速度快 ,是甘肃今后油松调种的主要范围 ,分布在边缘地带的油松种源生长普遍较慢 ,一般不宜采用 相似文献
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对华南地区短枝木麻黄种源 16个性状的两试点联合方差分析表明 :除 PBA和 PBL 外 ,其它性状在地点间有极显著差异 ,表明参试种源在两个地点分别进行种源筛选 ;除 1年生树高、2～ 3年生单株材积外 ,其它数量性状在种源间有显著或极显著差异 ;4年生的树高、胸径、单株材积、PBD、PBT、PBL在种源×地点 ( P× S)互作间有显著或极显著差异。方差分量比例计算结算表明 ,2～ 4年生时 ,除 4年生单株材积方差分量比例略有降低外 ,树高、胸径和单株材积的地点方差分量比例及 P× S互作的方差分量比例均随年龄的增加而增加 ;质量性状 SFA、SFS、PBD和 PBT,地点方差分量比例最大 ,而种源或加上 P× S互作的方差分量 <10 %。当不考虑 P× S互作效应时 ,种源数量性状和质量性状的遗传变异系数和广义遗传力均比考虑互作效应时相应性状的遗传变异系数和广义遗传力大。4年生树高、胸径、保存率、SFA和 SF S等 6个性状 ,按地点对参试种源进行评定结果为 :试验 E94 6中 ,优良种源为 180 86、18118、183 55、180 13、182 4 4、18119、182 88、183 4 8、180 15和 180 0 8;试验 E94 4中优良种源有 18154、183 55、1812 8、18143、18153、1812 7、1813 4、142 3 3和 182 88。这些种源均好于国内对照种源 ,分别占各自参试种源的 相似文献
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The phenology of 5- and 6-year old loblolly pine (Pinus taeda L.) trees was studied over two different growing seasons (1993 and 94) in southwest Georgia. These trees were from 7–9 open-pollinated families from each of four different provenances planted at two locations. The provenances were: Atlantic Coastal Plain (eastern SC), Gulf Hammock (north FL), Lower Gulf (south AL, MS) and Upper Gulf (north AL, MS). Provenances did not vary as to when height growth started in spring, but showed very significant differences for the date of growth cessation in fall. The Gulf Hammock source grew the most and also had the longest height growth period, while the Upper Gulf source was first to stop height growth and had the least annual height increment. Provenances were also significantly different for the date of cessation of diameter growth (a difference of 22 days between Gulf Hammock and Upper Gulf), and the order of cessation was the same as for height. Families within provenances were significantly different for date of cessation of height growth and diameter growth. When family means were considered across provenances, there was a correlation of 0.69 (p-value = 0.0001) between annual height increment and date of height growth cessation. There was a weaker association between faster growth and a longer growing season within provenances. 相似文献
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对广东省乐昌市江南油杉(Keteleeria cyclolepis) 种源/家系试验林内 1 a生苗木和2 a生幼树生长开展试验分析,统计分析结果表明:苗木和幼树的种源效应和种源内的家系效应均达到显著或极显著水平(P<0.05,P<0.01),开展优良种源和家系选择可行;相关性分析表明苗木与幼树生长性状存在极显著的相关关系(α=0.01),苗木生长表现优良的种源/家系,在试验林中生长表现也较优;遗传参数估算研究表明,种源遗传力略大于家系遗传力,但各测定遗传力均处于中等偏下水平;早期优良种源、家系选择研究中,根据各种源/家系的高度和地径生长表现,选出优良种源2个,优良家系6个,优良家系均产于优良种源内. 相似文献
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Height after 15 years, bud burst and mortality varied significantly among 13 southern Italian (Calabrian), a central Italian, a German (Schwarzwald), a Romanian (Carpathian), and a Danish provenance of silver fir (Abies alba Mill.) tested in two field trials in Denmark. The variation in height was especially observed in the field trial that was well protected against late frost in the spring and early frost in the fall by a shelter wood of larch. Provenances from the region of Serra San Bruno (Calabria) and two provenances from the region of Gariglione (Calabria) showed superior height growth at this site compared with the remaining provenances. Height was below average for two provenances from the region of Aspromonte (Calabria). The variation in height correlated significantly with biomasses of the same provenances obtained in early tests. Bud burst was earlier among provenances from the regions of Serra San Bruno and Aspromonte. These were also characterised by poor winter-frost resistance in early tests. The Romanian provenance was not represented in the shelter wood trial. The variation in height between provenances in the other field trial was mainly due to the Romanian and the Danish provenance with superior and poorer growth respectively. Otherwise, differences between the remaining provenances were not significant at this site probably due to the influence of frost. Provenances with poor winter-frost resistance had higher mortality at this site. 相似文献
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Summary The paper deals with results of the survey 1968. The trial was initiated in the year 1936 with autochthonous provenances of
different elevations and regions of pre-war Germany to give information on growth, production of valuable timber and resistance
to the manifold dangers in the region of experiment. A comparison is made with the parallel experimental areas in Thuringia,
Saxonia and Wuerttemberg. In Bischofsreut an interdependence between the type of flushing or elevation of mother stand and
growth, and a superiority of the late flushing provenances in the rough climate of the experimental area could not be traced.
Provenances of the two highest elevated stands were slow growing, thus indicating that growth is slower, the nearer the mother
stand is situated at the respective limit of tree growth.
Damages by snow breaks varied among the different provenances. With regard to the number of trees per unit area provenances
of highlands suffered least. Stem rot rising from the roots was not found and is not to be expected in the near future.
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利用28个木荷种源的苗期测定材料,研究了不同种源的干物质积累和分配规律。结果显示:木荷苗期单株及其根、茎、叶各器官的干物质积累量在不同种源区间和种源区内不同种源间存在显著的遗传变异,这种变异主要来源于种源区内种源间,其次是来源于不同种源区间。木荷苗期单株及各器官的干物质积累量呈典型的纬向渐变模式,即南部种源区>中部种源区>北缘种源区,而与经度的相关性较小。研究发现,不同种源区间木荷干物质积累量在地下和地上部分的分配比例(即根冠比)遗传分化较小,变异主要来源于种源区内种源间,木荷种源根冠比表现为随机变异的地理模式,自然分布区内降雨量丰富,较少干旱胁迫可能是其主要的原因之一。 相似文献
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对7个巨桉(Eucalyptus grandis)种源4a生时的生长性状进行测定分析,利用主成分分析结合模糊聚类法对各种源进行综合评价.结果显示:(1)7个种源间存在分化和差异,其中15508号种源平均树高及单株材积最大,分别为10.48 m、0.022 8 m3;13019号种源平均胸径和保存率表现最优,为8.09 cm和79％;种源16500号干形生长表现最优.(2)树高、胸径与单株材积三者与干形、保存率及海拔间均存在负相关;保存率与南纬、东经呈现显著正相关(P＜0.05),与海拔呈现负相关;干形与南纬、东经呈现负相关,与海拔间呈正相关.(3)基于主成分分析确定巨桉种源树高、胸径、单株材积、干形及保存率指标所占权重分别为:0.267 5,0.262 9,0.266 8,0.163 5和0.039 3.(4)根据综合评分及模糊聚类,第Ⅰ类种源(种源13019、15508、15875和16500)生长表现最优,适宜在引种地种植,其余种源可通过进一步测定选择优良个体作为世代育种材料. 相似文献