不同种源及基质对水青树种子萌发及幼苗初期生长的影响  

Effects of different geographical provenances and matrix on seed germination and seedlinginitial growth of Tetracentron sinense

作　　者：曹玲玲[1,2] 甘小洪[1,2] 何松[1] 

机构地区：[1]西华师范大学生命科学学院,四川南充637009 [2]西华师范大学西南野生动植物资源保护教育部重点实验室,四川南充637009

出　　处：《广西植物》2012年第5期656-662,共7页Guihaia

基　　金：国家"十一五"科技支撑计划项目(2006BAD19B02);四川省教育厅青年基金(2006B038)~~

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。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 1000seeds , 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 theendangered 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.

关 键 词：水青树 种子 萌发 幼苗 

分 类 号：Q945.34[生物学—植物学]