| 摘要: |
| 通过对4个不同种源地的水青树种子进行形态与生理特征的研究,探讨了不同种源、基质及温度对水青树种子萌发和幼苗初期生长的影响,以了解该物种种群自然更新困难的原因。结果表明:(1)不同种源的种子,其千粒重、饱满度及形态学方面存在显著差异。(2)不同种源的种子的萌发率分别为:74.67%(雷波)、41%(马边)、67%(九寨沟)、0%(美姑),对应的发芽势分别为38.33%、10%、27.33%、0(P<0.01);(3)在不同的萌发基质中,腐殖土中的萌发率、萌发势及幼苗的长势均优于生境土和沙土,而沙土中种子的萌发与幼苗的生长最差,因此水青树生境地的土壤不是其自然更新的限制因素;(4)常温下不同基质中,水青树种子的萌发率均高于恒温条件,表明适宜的变温处理有利于种子萌发及幼苗存活;(5)综合分析可知,雷波的水青树种子品质较好,马边的则较差。 |
| 关键词: 水青树 种子 萌发 幼苗 |
| DOI：10.3969/j.issn.1000-3142.2012.05.017 |
| 分类号:Q945.34 |
| Fund project: |
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| Effects of different geographical provenances and matrix on seed germination and seedling initial growth of Tetracentron sinense |
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CAO Ling-Ling1,2, GAN Xiao-Hong1,2*, HE Song1
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1.College of Life Sciences, China West Normal University, Nanchong 637009, China;2.Key Laboratory of Southwest
China Wildlife Resources Conservation, China West Normal University, Nanchong 637009, China
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| Abstract: |
| In order to explore the bottleneck of natural regeneration and endangered mechanism in Tetracentron sinense population,the morphology,physiological characteristic and seed germination characteristics of the seeds from four different geographical provenances were measured,and the effects of different temperature,matrix and geographical provenances on seed germination and seedling initial growth were studied. The results are as follows:(1)There were significant difference in the weight per 1000 seeds,plumpness,morphology of different geographical provenances;(2)Germination rate of seed from the different geographical provenances was respectively 74.67%(Leibo),41%(Mabian),67%(Jiuzhaigou),0(Meigu),accordingly the corresponding germination force was respectively 38.33%,10%,27.33%,0%(P<0.01);(3)The seeds in the habitat humus soil had the better advantage in germination rate,force and seedling initial growth than those in soil from habitat or sandy soil,suggesting that the habitat soil was not the endangered factor;(4)The room temperature was better for the seed germination and seedling initial growth than constant temperature,indicating that appropriate alternating temperature was advantage to the seed germination and seedling initial growth;(5)Based on the analysis of seed morphology and germination characteristics,the quality of T.sinense seeds from Leibo were better than that of Mabian and Jiuzhaigou. |
| Key words: Tetracentron sinense seed germination seedling |
