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经过10多年努力,姥山马尾松1代无性系种子园建成投产,经造林测定,6年生子代林的树高、胸径、村积生长量分别比对照提高15.2%、18.4%、56.8%.良种效益显著,并经浙江省林木良种审定委员会审定通过。 相似文献
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长白落叶松优良家系选择的研究 总被引:1,自引:1,他引:0
抚顺县哈达部省合建林木良种基地,于1985~1986年共营造长白落叶松19个家系的子代测定林。经1994年秋调查分析,共选出12个优良家系。其优良家系的平均遗传力,树高为0.784,胸径为0.678,材积为0.710;平均遗传增益,树高为9.8%,胸径为10.0%,材积为26.2%。实现材积增益超过对照159.3%,超过家系总平均值的37.5%。 相似文献
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油茶优良无性系选育及测定研究 总被引:9,自引:0,他引:9
在1980 ̄1990年开展长埠《油菜无性系早实丰产配套技术研究》中试同时,对参试的油茶无性系进行了长期观察、调查,并对照全国油茶优树标准,1995年优选出了长林53号等18个适合本地区栽培的优良无性系,每hm^2产油脂885.75 ̄512.85kg,比实生对照增产189.2% ̄67.43%,超过国标96.8% ̄14%,抗病力强,果实炭疽病率为0。1996年1月被江西省林木良种审定委员会认定为18个 相似文献
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根据错海林木良种基地小区试验和中试结果认为:喷施稀土、满果粉对提高球果、种子产量和种子质量均有明显的效果;在小试的4种剂型和中试的3种剂型中,均以满果粉和农乐效果最好,产种量比对照有提高:樟子松22.1%-47.0%、长白落叶松13.4-50.5%;在樟子松种园中,出种率、千粒 芽率及发芽势分别比对照提高8.7%、13.9%、27.0%、30.3%;在长白落叶松种子园中,出种率、千粒重、发芽率重、 相似文献
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根据错海林木良种基地小区试验和中试结果认为:喷施稀土、满果粉对提高球果、种子产量和种子质量均有明显的效果;在小试的4种剂型和中试的3种剂型中,均以满果粉和农乐效果最好,产种量比对照有提高:樟子松22.1%~47.0%、长白落叶松13.4%~50.5%;在樟子松种子园中,出种率、千粒重、发芽率及发芽势分别比对照提高8.7%、13.9%、27.0%、30.3%;在长白落叶松种子园中,出种率、千粒重、发芽率、发芽势分别比对照提高2.4%、28.3%、7.7%和6.3%;在促进结实提高产种量上,最佳浓度均为0.05%。经测算,樟子松种子园和长白落叶松种子园中投入产出比分别为1∶4和1∶8,经济效益显著 相似文献
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连续3年的试验研究表明,采用合理的定植密度,定干高度和修剪方式,配合科学的田间管理措施,可以使柳树良种采穗圃穗条产量比对照提高40%~50%,穗条质量优良,达到了快速繁殖良种的目的。 相似文献
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连续3年的试验研究表明,采用合理的定植密度、定干高度和修剪方式,配合科学的田间管理措施,可以使柳树良种采穗圃穗条产量比对照提高40%~50%,穗条质量优良,达到了快速繁殖良种的目的 相似文献
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关于黑龙江省杨树引种与发展乡土树种大青杨展望 总被引:4,自引:0,他引:4
通过调查黑龙江省森工林个世纪70年代以来,不同规模水平的杨树引种,均以冻害破肚根腐为受害特征而失败。事实说明,发展杨树乡土树种(大青杨、香杨),是营造速生丰产林及改善树种结构稳妥办法。本文介绍了大青杨发展及良种选育状况,伊春林科辽坜经12年选育的伊7号等大青杨优良无性系,树高与胸径比对照提高了35.2%-48.4%及36.4%,比大青杨同龄丰产林材积省标提高了63.82%-187.36%。 相似文献
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毛白杨生长和收获模型 总被引:3,自引:0,他引:3
本文介绍了根据毛白杨调查数据检验J.L.Clutter的火炬松生长和收获模型的过程和结果。在他的模型基础上,根据毛白杨的生长特点,作了一些修改,分别为该树种成片林和林带制定了生长和收获预测模型,并编制了毛白杨地位指数曲线。 相似文献
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用标准地法对黄泛平原毛白杨、刺槐纯林和混交林根分泌物、土壤微生物、土壤养分及其与林木生长的关系进行了研究,结果表明:1、混交林根际土壤总菌数高于纯林,混交林和纯林根际细菌、放线菌和总菌数高于根外,F 检验达极显著和显著水平。2、混交林毛白杨、刺槐根泌氨基酸和酚量高于纯林毛白杨和刺槐,可溶性糖和有机酸量则低于纯林毛白杨和刺槐。3、不同林分根际、根外土壤养分有明显变化。土壤速效磷含量在不同林分和根际、根外的差异均达极显著水平。树种(?)交后所表现的生长优势己证实是由于毛白杨、刺槐根间有益的交互作用及土壤微生物模式的变化所引起。 相似文献
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通过小美旱杨伐根嫁接三倍体毛白杨引种造林试验研究,结果表明,伐根嫁接的三倍体毛白杨成活率达88%;1年生幼树生长量大于小美旱杨扦插苗,嫁接5a后平均树高9.18m,胸径9.52m,均高于同龄的小美旱杨,且表现出了耐寒抗旱的特性。伐根嫁新方法更新三倍体毛白杨比植苗更新节省造林资金70%-80%。 相似文献
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农田防护林更新树种选择及配置模式研究 总被引:5,自引:0,他引:5
对农田防护林更新树种和配置模式进行了分析研究。从新品种的引种上筛选出适于河西走廊发展的农田防护林树种为三倍体毛白杨B10 0 8和BT85 ,并能在瘠薄和盐碱化土壤上良好生长 ;经抗寒性分析得出垂柳、云杉、白榆、柽柳、沙枣抗冻性较强 ;为减缓天牛等蛀干害虫危害 ,在林网配置模式上引入了云杉、侧柏、樟子松、垂柳、小叶白蜡、国槐等耐瘠薄抗寒性强的树种 ,营造多树种林带 ,组成混交林网结构 ,使林网中感虫杨树的比例占 2 0 %左右 ,增加了林网结构的稳定性和长效性 相似文献
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QINGuanq-hua JIANGYue-zhong QIAOYu-ling B.Nottola 《林业研究》2003,14(3):225-229
Poplar is one of the dominant tree species for the establishment of fast growing plantations in Shandong Province.Eighteen poplar clones belonging to Populus aigeiros section were introduced from Italy, Turkey and domestic regions. Populus deltoides cv. ‘Lux‘ 1-69/55 (1-69), which was widely used in Shandong Province, China, was taken as control clone (1-69).Following a randomized complete block design, seedling test and controlled afforestation trials were carried out at Juxian County,Caoxian County and Laiyang City. The results showed that the poplar clone (Populus x euramericana cv. ‘102/74‘), namely 102/74, performed well both in terms of adaptability and growth rate. The mean height of 13.9 m (H), diameter at breast height of 18.0 cm (DBH) and volume growth of 0.1445 m3 (V) were 2.2 %, 21.6% and 52.9% higher than those of 1-69 (CK), respectively,at the age of 5 years at three experimental sites. Moreover, the clone can be propagated easily and showed high resistance to poplar disease, pest as well as salinity and had longer growing period. Furthermore, wood basic density and fiber length of new poplar clone (102/74) were as same as 1-69 (CK). It was concluded that the selected clone (102/74) was ideal for the estab-lishment of fast-growing poplar plantations, especially for the pulpwood plantations in Shandong Province. 相似文献
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Riparian poplar forests are declining downstream from many dams in the western prairie regions of North America. Drought-induced seedling and sapling mortality caused by abrupt drops in water table level following river flow regulation may be contributing to this forest decline. Here we describe a device, the rhizopod, for studying the influence of a changing water table on poplar seedling survival and growth. Seeds of a natural poplar hybrid (Populus deltoides x P. balsamifera) were planted in five rhizopods and treated to water table declines of 0, 1, 2, 4, or 8 cm day(-1). Each rhizopod consisted of 15 growth tubes connected to a central water reservoir through which the water level was regulated. Seedling survival was over 90% in rhizopods in which water table declined by 0, 1 or 2 cm day(-1), but was reduced to about 40% and less than 25% in rhizopods in which the water table level declined by 4 and 8 cm day(-1), respectively. Maximum shoot height, leaf number, and leaf area were observed in the rhizopod with a constant water table and decreased progressively with increasing rates of water table decline. Maximum root mass and length were observed in plants subjected to declines in water table level of 0 and 1 cm day(-1), respectively. 相似文献