不同贮藏与萌发方式下的亮叶桦种子萌发差异.PDF

: 1 2 1 1 , , , ( 1., 650223; 2. , 551700) :亮叶桦是我国特有的优良速生树种,其种子贮藏特性备受关注本研究设置了低 和常 两种处理, 通过不同贮 藏时间的实验室萌发和土壤萌发试验, 探讨不同贮藏与萌发方式下亮叶桦种子的萌发差异结果表明, 低 贮藏条件 下,亮叶桦种子活力在 1年内未发生显著变化; 常 条件下,种子成熟后贮藏 160 d,亮叶桦种子发芽能力发生显著改变, 但贮藏 1年之后仍有 50. 0%的萌发率贮藏后萌发条件的不同导致亮叶桦萌发率不同在昆明自然光照和 度条件 下,贮藏时间增加会降低亮叶桦种子在土壤中的萌发率,萌发 度的差异也会影响种子的萌发速度及整齐度,但常 贮 藏 370 d后的种子在昆明自然状况下的萌发率仍有 34. 8%, 表现出一定的耐贮性 : ; ; ; + : S 722. 1 7 : A : 1001- 4705( 2010) Germ ination Differences ofB etula lum infi era Seeds under DifferentStorage andGermination Condition 1 2 1 1 ZHAO Chunyan , XIE Yonggui, SHEN Youxin, TANG Yingyin ( 1. X ishuangbannaTropicalBotanicalGarden, ChineseAcademy of Sciences, KunmingYunnan 650223, China; 2. Forestry Science Institute ofBijiePrefecture, Guizhou Province, BijieGuizhou 551700, China) Abstract:B etula lum infi era is a unique excellent fastgrow ing tree species in China. However, its seed longevi ty is controversy. Germination capability of seed stored under lowtemperature and naturalroom environment were studied in both laboratory and natural soil condition to observe the seed longevity ofB e tula lum infi era in Kunming. The result showed that seed vigorkept invariant after one year storage under lowtemperature. Seed germination changed significantly after 160 days! storageundernaturalroom environment, but germination rate still kept at 50. 0% storaged forone year. Different germination conditions alsomade the differ