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滇中地区核桃杂交早实优株无性系的种植试验 总被引：3，自引：0，他引：3
在滇中地区的昆明通过对11个核桃杂交早实优株无性系5年的种植试验，选择出适于本区种植的306号和303号2个优株无性系。其树体生长量大，枝条数量多，花枝率和座果率均高，种植后第5年单株产量分别达5．68kg和5．28kg，大大高于其他参试株系。306号和303号2个株系种实外形美观，商品性状好，无露仁无空粒，品质好，种仁含油量较高，综合性状优于其他株系。 相似文献
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《林业科技开发》2000,(5)
■窄冠毛白杨 5、6号优良无性系窄冠毛白杨 5号、6号无性系是经过杂交、苗期选择、无性系对比试验等多年的测试而选育出的白杨派优良无性系。其树冠窄 ,生长快 ,干形饱满通直 ,材质好 ,生长量大 ,单株材积分别超过对照抱头毛白杨 2 40 %和 170 %。试验证明以上两个无性系是营建农田林网、进行林粮间作的优良无性系。进行 2 0ｍ× 4ｍ的林粮间作 ,每公顷 12 0株 ,10年生时可长成胸径达 30ｃｍ的中径材 ,每株价值 2 0 0元 ,6 6 7ｈｍ2 示范区仅木材收入就达 16 0 0万元 ,而且农作物基本不减产 ,同时产生巨大的生态效益和社会效益。适用范围 :… 相似文献
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窄冠白杨5号、6号的选育,是作者进行的白杨派树种杂交育种工作的一部分,目的是育出一批适于林粮间作和农田林网采用的优良无性系。经过室内杂交、苗期无性系测定、观察性造林试验,多点无性系对比试验,根系及材性研究和杨粮间作试验,证明窄冠白杨5号(12—3)、6号(4—3),具有树冠窄、根系深、生长快、材质好、抗性强、主干圆满通直等特性。两无性系用于林粮间作,行距15—20m,株距4m,每亩8—10株,10年生,可长成30cm的中径材,间作区粮棉基本不减产。 相似文献
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经测试,(1)刚果12号桉W5无性系立木1.3m高处和3/4树高处的木材密度分别为475.994 444 kg/m3和465.955 555 kg/m3,1.3 m高处的木材密度比3/4树高处的木材密度大2.11%,经作t检验两者无显著差异,刚果12号桉W5无性系立木木材平均密度为471.0 kg/m3.(2)尾叶桉U6无性系立木1.3 m高处和3/4树高处的木材密度分别为438.955 556 kg/m3和428.816 667 kg/m3,1.3 m高处的木材密度比3/4树高处的木材密度大2.31%,经作t检验两者略有差异,尾叶桉U6无性系立木木材平均密度为433.911 111 kg/m3.(3)刚果12号桉W5无性系立木木材平均密度比尾叶桉U6无性系立木木材平均密度大8.55%,1.3m高处密度大8.44%,3/4树高处密度大8.66%,并经分别作t检验刚果12号桉W5无性系立木与尾叶桉U6无性系立木木材密度有明显的差异. 相似文献
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采用5个无患子果用优良单株无性系,在顺昌县营造区域试验林,通过对2年生各无性系的生长和开花结实性状调查测定和分析,结果表明:利用无患子果用优株无性系嫁接苗造林2年生植株开花株率达25.6%~34.9%,结实株率达16.6%~30.7%,平均单株产量0.26~0.54kg,最高单株产量达0.92~2.68kg;与采用一般实生苗造林7年生植株开花株率为22.7%且无结实相比,开花结实提早6年以上,具有明显的早实丰产效应;各无患子果用无性系间开花枝数、结果枝数及单株产量间存在显著差异,表明无患子果用优良无性系筛选的空间较大。 相似文献
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连续5a对闽北浦城引种的11个油茶优良无性系的生长及果实经济性状进行跟踪调查测定。结果表明：不同油茶无性系的树高、地径、冠幅面积、果实性状及产量均存在显著或极显著差异;11个无性系的年均冠幅产果在1.01～2.74 kg·m-2之间,年均产油268.92～1011.75 kg·hm-2,其中闽48、闽60、长林3号、长林40号、闽43的产量较高,年均产油超过油茶优良无性系年均产油标准值450 kg·hm-2的79.55%～124.83%,适宜在浦城县推广种植;赣447、赣石84-3无性系的产量较低,不适宜在本地推广种植。 相似文献
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二十个油桐优良单株后代测定 总被引：1，自引：0，他引：1
从正安39株油桐优树中选择20株进行子代及无性系测定,6年的观察研究表明,2号、5号家系为优良家系,家系遗传增益达12.9％;5号无性系为优良无性系,遗传增益达27.7％。5号优树在群体子代和无性系测定中均表现出了良好的遗传品质和较高的遗传增益,应加速利用。 相似文献
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在采用指标法选出50个板栗优良单株的基础上,经过10年的无性系子代鉴定和产量比较试验,生长习性,结果习性和抗逆性观测,及对其果实的营养成分分析,最后筛选出“安栗一号”和“安栗二号”2个优良单。选育结果表明：安栗一号和安栗二号的连续3年平均产量可分别达到2268,2286kg/hm^2,第2年结果株率为95．0％和95．5％,出果率为45．2％和45．7％;3年生板栗树结果枝率分别为95．7％和92．5％;果实中淀粉、粗蛋白、可溶性糖、粗脂肪的含量分别达到504,84．2,253,51．2g/kg和512,82．5,251,51．3g/kg;2个品种还具有耐旱、耐瘠薄、抗病虫能力强和适应性广等特点。 相似文献
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Comparison and early selection of new clones in <Emphasis Type="Italic">Populus tomentosa</Emphasis>
In our study, two experimental plantations, respectively, with 24 and 32 new clones of P tomentosa, were established in Weixian County, Hebei Province and Wuzhi County, Henan Province using a completely randomized block design. A comparative study was conducted on the continuous 5-year-old height and diameter at breast height （DBH） of new clones in the two plantations. As well, based on genetic correlation over the years of testing of these clones, a preliminary study of early selection was carried out. Results indicate that the growth traits of the new clones in Weixian were better than those in Wuzhi. The traits show weak correlation between the two plantations. In some stands, the height, DBH and seedling volume of 5-year-old clones presented statistically significant differences among clones. In both plantations, the new clones showed over 0.6 repeatability of height, DBH and volume, as well as larger coefficients of variation （CV）. The fact that these clones achieved the largest repeatability and CV in the second year suggests that these traits are highly controlled by heredity. Thus, based on the growth traits of the second year, the new clones B305, B307, B303, H75, BT18, BT17 and 21J-1 were considered suitable in Weixian. In Wuzhi, the new clones had variable repeatability and CVs in various years and their correlation of growth traits among different years was not high. We conclude that early selection of new clones was not feasible in Wuzhi. 相似文献
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In our study, two experimental plantations, respectively, with 24 and 32 new clones of P. tomentosa, were established in Weixian County, Hebei Province and Wuzhi County, Henan Province using a completely randomized block design. A comparative study was conducted on the continuous 5-year-old height and diameter at breast height (DBH) of new clones in the two plantations. As well, based on genetic correlation over the years of testing of these clones, a preliminary study of early selection was carried out. Results indicate that the growth traits of the new clones in Weixian were better than those in Wuzhi The traits show weak correlation between the two plantations. In some stands, the height, DBH and seedling volume of 5-year-old clones presented statistically sig-nificant differences among clones. In both plantations, the new clones showed over 0.6 repeatability of beight, DBH and volume, as well as larger coefficients of variation (CV). The fact that these clones achieved the largest repeatability and CV in the second year suggests that these traits are highly controlled by heredity. Thus, based on the growth traits of the second year, the new clones B305, B307, B303, H75, BT18, BTI7 and 21J-1 were considered suitable in Weixian. hi Wuzhi, the new clones had variable repeatability and CVs in various years and their correlation of growth traits among different years was not high. We conclude that early selection of new clones was not feasible in Wuzhi. 相似文献
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1994年在昆明、玉溪两试验点营造的直干桉和蓝桉无性系测定林,根据1999年的生长数据分析后看出两地的测定林都是直干桉比蓝桉生长好,玉溪两个树种的生长都比昆明好.在直干桉无性系中两试验点的生长性状差异均达显著或极显著水平,而蓝桉无性系在两试验点都不显著.在昆明试验点测定林保存完好的无性系中,直干桉有5个、蓝桉有3个无性系的材积超过对照(实生木),其中超过30%有6个(直干桉4个,蓝桉2个).玉溪试验点参试的7个直干桉无性系有6个的材积超过对照,其中材积显著大于对照的有两个;蓝桉3个无性系中没有1个超过对照.根据云南省目前的经济技术水平,走选优、建园的遗传改良途径更为积极稳妥. 相似文献
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美国山核桃在云南的引种适应性报告 总被引：10，自引：5，他引：10
1974～2000年美国山核桃在云南省漾濞、永平、昌宁等地进行引种试验和扩大引种试验表明，该树种生长量以第7年最大，金华和绍兴品种结果多，产量高；山站2号和兴林13号各项丰产指标均低，株产量少；结实大小年明显，金华品种为2年一周期，绍兴为3年；与原产地浙江相比，品质较好；在中亚热带生长和开花结实表现很好。美国山核桃与国内外在良好管理条件下的产量和质量基本相同，适宜于云南省栽培。从而为云南省增添了一个新的经济林木树种，填补了核桃分布下限没有好的油料干果树种可供发展的空白。 相似文献