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在被当地群众称之为“烂头山”的水土严重流失地区，引入原产澳大利亚的耐旱相思后，成功地改变了荒山秃岭的面貌，初步控制了水土流失。经过３ａ连续试验和观测，在１８个树种４９个种源中，初步筛选出并行相思１７０２４、１７１４１号种源；大叶相思１６３５５、１６１４７、１６４８４号种源；黄花相思１５４８１、１４９６８、１４５９０号种源；薄荚相思１６１１０、１５４７８号种源；鞘尾相思１７９０６、１７０５０号种源；丝毛相思１６６４３、１５７３２号种源；厚荚相思９１０００号种源；大花相思１４６６８号种源；巴氏相思１７７１８、１５４８０、１６１３４号种源等９个树种１９个种源，这些树种与种源适应性强，速生，生物量大，植后当年即可郁闭，枯枝落叶覆盖了林地，初步起到保持水土的作用。 相似文献
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以赤桉４批试验林的４２个种源为研究材料，分析了４～８年生幼林种源间的生长差异，及与原产地地理位置的关系。试验结果表明：（１）种源间树高生长差异极显著，胸径和材积生长除第三批试验林外，均达极显著水平。（２）低纬度种源生长快，高纬度种源生长慢；沿海种源生长好，内地种源生长差。４批试验林种源产地不同，受经纬度影响程度不一样。（３）经指数综合评定，第一批试验林评选出１３６６３、１３６９２，第二批试验林评选出１２５０１、１３９２８、１３９３５，第四批试验林评选出１７２９７、１５０５０共７个速生优质种源，这些种源大部分分布在澳大利亚沿海地区，３个来自昆士兰州北部，２个来自北澳，２个来自西澳州。 相似文献
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吉林省主要造林树种种源研究组 《吉林林业科技》1997,(3):1-4
本文通过7年生、6年生长白落叶松地理种源2次试验13个参试点、19个采种点生长分析表明：长白落叶松种源间差异极显著，优良种源总平均村积生长量分别为对照种源的2．5倍，最差种源的6．9倍。将参试种源共划分出四种类型，为各造林区选出了最佳种源及优良种源。 相似文献
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通过对油松３个种源、１８个林分、５４个半同胞家系的苗期６个性状，进行了３水平遗传变异测试分析。结果表明：种源间、家系间生长差异达极显著水平，林分间差异不显著，效应呈种源＞家系＞林分，种源的遗传变异参数最大、选择效果最好，在选择优良种源的基础上选择优树，其育种效果将会更好。 相似文献
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红锥种源多点育苗试验研究 总被引：4，自引：0，他引：4
通过在7个育苗点进行10个红锥地理种源的育苗试验研究，进行了种源种子千粒重、苗高在种源和育苗点的变异性分析，10个种源间在千粒重上存在极显著差异，种源间的平均苗高差异不显著，而各育苗点间的苗高存在极显著差异。对种源来源地概况、种源种子千粒重与种源平均苗高，育苗试验点概况与苗高等各因子进行了相关性分析，种源种子千粒重与种源的平均苗高呈极显著正相关，平均苗高与种源来源地的经度、年均温、年降雨相关不显著；苗高与年均温、1月均温呈显著的正相关，各育苗点的年降雨、湿度、极端高温、7月均温与苗高相关不显著。 相似文献
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建国后，福建省引种成功的树种有２００余种，驯化栽培成功的乡土树种４０余种，确定了一些主要造林树种优良种源，对一些优良树种无性繁殖技术有所突破，建立了外来树种和乡土珍贵树种良种生产基地。针对存在的主要问题，提出若干对策。 相似文献
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１９９２年３月选用广西宁明和福建尤溪县马尾松２个种源，在尤溪洋中进行不同种源、不同密度和不同挖穴规格种植试验。结果表明：宁明种源优于尤溪种源；经方差分析两种密度和大、中、小挖穴规格对幼林生长量无显著性差异；应用林木费用价法可看出马尾松速生丰产林营建采用容器苗中、小穴造林可节省造林投资和减少挖穴土方量，并可保持幼林期的生长量。 相似文献
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根据安排在来舟林业试验场的试验及调查材料，对杉木种源、家系、人工林、杂交Ｆ＿１代中的灰杉、黄杉叶色类型比例进行比较分析；并对其生长表现、木材物理力学特性等进行了比较研究。结果表明：杉木的叶色类型遗传可能是由基因组控制的；杉木种源的叶色比例与生态环境有关，同一种源或家系内的灰杉、黄杉在中心产区同类立地上生长差异不大；黄杉可能具有较强的适应性。 相似文献
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相思(Acacia spp.)类树种类型多,分布广,除欧洲及南极外各大洲均有分布,尤以澳大利亚最多,其次为非洲;该类树种主要生长在干旱半干旱地区,垂直分布在海平面附近至1 500 m以上;该树种生长快,用途广泛,有根瘤,具有强力固氮作用[1,2];生物量大,枯枝落叶多,对土壤有很好的改良作用[3～5];此外,网脉相思(Acacia aneura F.Muell.ex Benth.)、维多利亚相思(A.victoriae Beath.)还能用作饲料,如网脉相思被认为是澳大利亚干旱季节牲口最充足和营养丰富的饲料.20世纪60年代以来,我国已引种了大叶相思(A.auriculaeformis A.Cunn.)、马占相思(A. mangium Willd.)、厚荚相思(A. crassicarpa A.Cunn. ex Benth.)、纹荚相思(A.aulacocarpa A.Cunn ex Benth.)等,这些相思树种在荒山绿化、薪炭林经营、水土保持及公路建设中发挥了重要作用. 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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Kamis Awang Perugupalli Venkateswarlu Abd.Shukor Nor Aini Goran Adjers Suree Bhumibhamon Bopit Kietvuttinon Fuh-Juinn Pan Kiatkong Pitpreecha Apisit Simsiri 《Forest Ecology and Management》1994,70(1-3):147-158
The performance of 25 provenances in international trials on seven sites in four countries was assessed for survival and growth at 3 years. Of these provenances, seven were from Queensland, 12 from Northern Territory, Australia, and six from Papua New Guinea. Significant growth differences were found: (a) among provenances at four sites, (b) among the sites, and (c) between provenance regions. The interaction between sites and provenances as well as between sites and provenance regions was also significant. The poorest growth was recorded in Kanchanaburi, Thailand, while the best growth was in Banjarbaru, Indonesia. Stability analyses of the provenance x site interaction revealed eight provenances with high vigour and good tree form that were relatively stable across sites. These included Archer River, South Coen, Coen River and Wenlock River provenances from Queensland; Noogoo Swamp and Mann River provenances from Northern Territory; and North Bensbach and Old Tonda Village provenances from Papua New Guinea. 相似文献
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The frost hardiness of 16 European provenances of sessile oakQuercus petraea (Matt.)Liebl. originating from six Europeancountries was examined from autumn until budburst in springusing the method of relative conductivity. There were significant differences of frost hardiness betweenprovenances and a strong relationship between phenology andfrost hardiness. In spring, provenances that burst bud earlydehardened earlier than provenances that burst bud later. Inautumn, provenances that stopped growing early were more frosthardy than provenances that continued to grow. The interprovenance ranges of frost hardiness were greatestin spring and autumn and least in midwinter. Consequently, itwas not possible to demonstrate significant differences of frosthardiness between provenances in December and January. Overall, German, Polish and Danish provenances were more frosthardy than French, Austrian and British provenances. Frenchprovenances were least hardy at all times. 相似文献
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以引进俄罗斯不同种源欧洲垂枝桦为材料,对其播种苗生长进行了系统比较研究。结果表明:不同种源欧洲垂枝桦播种苗生长具有极显著的差异,其地径和苗高的生长量大小依次为新西伯利亚种源>巴尔瑙尔种源>阿尔泰种源>对照种源;模糊综合评价法分析表明,不同种源欧洲垂枝桦播种苗生长量排序依次为新西伯利亚种源>巴尔瑙尔种源>阿尔泰种源>对照种源,新西伯利亚种源是不同种源欧洲垂枝桦播种苗中综合生长量最大的一个种源。 相似文献
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The extent of genetic variation in seed length, width, thickness, weight and germination percentage and seedling traits among
and within 12 African provenances of Faidherbia albida was examined. The regional provenances showed a consistent variation
in seed length, seed width and seed weight: the southern African provenances had the largest seeds and west African provenances
the smallest. Seedling height, stem collar diameter and true leaf number differed (P = 0.05) among the provenances 90 days
after germination. The seedlings from west Africa were shorter, had smaller stem collar diameter and fewer leaves. In contrast,
the southern and east African provenances had taller seedlings with bigger seedling diameter and more leaves per seedling.
Seedling traits did not show clear-cut divisions between southern and east African provenances, but the west African provenances
formed a distinct group. Positive correlations were found in some of the seed characteristics and seedling height among provenances,
which could be an important criterion for early provenance selection. Greater variation was observed for seed and seedling
traits among than within provenances suggesting that selection among provenances might result in rapid genetic gain for the
traits studied.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献