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沙枣在吉林苏打盐碱土区的适应性研究 总被引:1,自引:0,他引:1
《吉林林业科技》2014,(1)
以甘肃张掖、新疆塔城、内蒙古巴盟磴口、加拿大埃德蒙顿地区生长的沙枣为种源,在吉林省西部苏打盐碱土区经过7 a引种栽培试验,结果表明:4个种源之间的物候期无明显差别,且与引种地相差不大;当年成活率达到90%以上,未发生盐害;株高、根径生长与引种地虽然存在一定差距,但差异不显著;加拿大、新疆、内蒙古种源可以自然越冬,甘肃种源越冬率在80%左右;未见明显病虫害。沙枣在吉林苏打盐碱土区具有良好的生长表现和适应性。 相似文献
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云南西双版纳大果紫檀种源苗期试验 总被引:2,自引:0,他引:2
在云南西双版纳对8个大果紫檀种源的苗期生长表现进行了研究,结果表明:大果紫檀种源间地径、苗高和径高比差异均极显著,越南种源的地径生长与绝大多数的泰国种源(MT5种源除外)差异不显著,但其苗高生长显著低于泰国种源,其径高比显著高于泰国种源;大果紫檀各种源的生长表现与其产地的经纬度呈现明显的相关性;以MT2和MT3泰国种源生长最快,可初步视为优良种源;大果紫檀各种源苗高生长均在2~5月份缓慢加快,6月份则生长迅速加快,与当地月最低气温有关。大果紫檀是一个典型的热带树种,在我国宜选择春季月最低气温较高的地区引种。 相似文献
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通过对滇西南地区15个县的0.5年生旱冬瓜种源的苗高、地径进行调查分析,研究了不同种源旱冬瓜苗高、地径的生长变异及其与地理环境因子的关系,利用苗高和地径2个因子进行逐步聚类分析。结果表明,各种源间在苗高、地径生长上均表现出极显著的差异,苗高生长表现最好的是孟连种源,平均苗高达31.4 cm;地径生长表现最好的种源是勐海种源,平均地径为0.38 cm。环境因子及地理因素对旱冬瓜种源的遗传变异有影响,苗高、地径与各种源原产地的地理经度呈负相关;采用种源间苗高、地径进行逐步聚类分析,15个种源可分为5类,根据各种源苗期苗高、地径的生长状况,初步筛选出瑞丽、孟连2个优良种源。 相似文献
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何平 《中南林业科技大学学报(自然科学版)》1992,(2)
对6种不同赤桉种源的光合作用性状进行比较。结果表明,不同种源在生长、叶绿素含量和叶绿素a/b及CO_2同化速率等方面,都表现出显著的差异,来自维多利亚的15028和15029种源生长最好,来自新南威尔士的15195种源和15028种源叶绿素含量最高,来自西部地区的13954和17296种源叶绿素a/b最大,在正常大气CO_2含量下,15029种源的光合速率比最低种源大73%。随着CO_2浓度增加,各种源间的CO_2同化速率差异增大。当CO_2~-分压达到65Pa时,各种源的CO_2同化率均达到最大值。 相似文献
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秃杉种源—家系联合试验表明,秃杉发芽、物候、苗期及幼林生长等11个性状中,真叶全现、一年生幼树抽高、一年生幼树全高种源间差异显著,发芽率、发芽势差异不显著;造林11年生时,种源间、家系/种源间生长性状差异显著,在遗传方差中,种源方差分量所占比例较大,种源效应最明显。选择秃杉优良种源有贵州交、贵州格、贵州昂、贵州丹、云南滕冲种源,优良种源平均单株材积遗传增益为29.68%,实际增益为34.60%。利用种源发芽、物候、苗期及幼林生长、11年生生长性状等11个性状,采用主成分分析方法,将秃杉区划为3个种源区,第1个种源区为湖北利川种源,第2个种源区包括云南昌宁、云南滕冲种源,第3个种源区包括云南龙陵、贵州丹、贵州格、贵州昂、贵州交种源,其中第3个种源区种源在广东生长表现良好,适宜在广东适生区域引种推广。 相似文献
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选择西南桦(BetulaalnoidesBuchHam.)中国分布区内的13个种源进行苗期对比试验。结果表明:各种源间在种子千粒重、苗木高生长、地径生长、苗木全株生物量方面存在明显的遗传差异;种源内部也存在个体间的遗传差异;经苗期物候观察,各种源除发芽始期遗传差异不明显外,发芽盛期、发芽末期、真叶出现期均存在一定差异。综合苗高、地径、全株生物量等指标,确定云南西畴新马街、西畴莲花塘、腾冲、潞西为苗期生长快、生物量大的种源;云南镇源、屏边、广西田林为苗期生长中等的种源;云南龙陵、景洪、广西平果、凭祥、百色、靖西为苗期生长慢的种源。 相似文献
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铅笔柏引种育苗与造林技术初步研究 总被引:2,自引:0,他引:2
辽宁省章古台从1994年开始引种铅笔柏,进行育苗与造林试验。试验结果认为,铅笔柏种子处理需要从1月下旬至4月下旬,约90d时间,发芽率较高;而从3月中旬至4月中旬开始处理的种子,因经过低温阶段时间短,故发芽率较低;铅笔柏越冬干梢与种源关系很大,美国南达科他州种源基本不受冻害,面安徽种源干梢较重,不宜直接引种;该树种在水肥充足条件下生长很快,4年生苗高达1.05m。 相似文献
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An investigation of seed germination and early seedling growth ofEucalyptus microtheca was based on seed collection from 10 widely separated provenances in Australia. Genetic variation of seed germination and
early seedling growth was observed among a series of provenances whose natural habitats range from different climatic condition.
In the ten provenances, both the model of seed relative germination percentage and the model of seed total germination percentage
fitted Logistic regression [y=a/(1+exp(-ex+b))]. In comparison with provenances from four high temperature (mean annual maximum
temperature >30.0 °C; mean annual minimum temperature >17.0 °C) areas, six low temperature (mean annual maximum temperature
<30.0 °C; mean annual minimum temperature <17.0 °C) areas showed the fast germination rate and the high total germination
percentage. For each provenance we have 45 seedlings equally divided into three watering levels (100%, 50%, and 25% of field
capacity), and studies on relationship between early seedling growth and climatic factors of the natural habitat of provenance.
In control treatment, height growth of the seedling has been associated with intrinsically the driest quarter precipitation
in the seed collection areas of provenance. In all the treatments, length growth of the biggest leaf of the seedling was related
to mean annual maximum temperature and mean annual minimum temperature in origin of provenance. In contrast, basal diameter
growth of the seedling was related to mean annual minimum temperature of the seed collection areas in water stress treatment.
From an ecological viewpoint, the fast germination rate and the high total germination percentage of the seed and rapid early
growth of the seedling appear to be favourable adaptations to the climatic conditions prevailing in the natural habitat of
provenance.
Responsible Editor: Chai Ruihai 相似文献
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《林业研究》2021,(1)
The rapid rate of deforestation in Cote d'Ivoire has led to loss of plant species diversity and also threatens some commercial tree species with extinction.Some reforestation and afforestation has been completed.However,for some species,the numbers of surviving transplants has declined.Hence,it is necessary to develop properly adapted and resilient genotypes that can effectively support the programs of forest restoration.In this context we evaluated the effects of the provenances of seeds and of various treatments on the germination rates and on plant growth of four commercial trees species(Pycnanthus angolensis,Terminalia superba,Mansonia altissima and Pterygota macrocarpa).We analyzed these parameters for seeds of three provenances(Daloa,Akoupe and Daoukro) of four species and for thirty plants aged 6 months per provenance.Time to begin germination and time to reach maximum germination were similar among species,and were not influenced by either treatment or provenance.Untreated seeds and those soaked for 24 and 48 h in water at room temperature yielded the highest germination rates,irrespective of species or provenance.The one exception was P.angolensis, for which no germination was recorded.Within species,some provenances produced higher germination percentages than did others.No clear relationship was computed between the germination rate and the morphometric characteristics of the seeds which varied significantly between provenances.Plant growth and morphological variability also depended greatly on provenance.Genetic factors might be implicated,therefore provenance trials should be undertaken and evaluated.Furthermore,molecular analysis should be undertaken to confirm the implications of genetic factors and allow for genetic selection. 相似文献
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日本落叶松种源选择研究初报 总被引:3,自引:2,他引:3
1979年始,进行了两次日本落叶松次生种源选择。结果表明,种源间差异显著;辽宁庄河、桓仁、本溪和吉林东丰种源最适应鄂西山区发展速生丰产优质工业用材林。 相似文献
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