光、凋落物和根茎浸提液对剑叶金鸡菊种子萌发和幼苗生长的影响  

EFFECTS OF LIGHT AND WATER EXTRACTION FROM LITTER AND RHIZOME ON THE SEED GERMINATION AND SEEDLING GROWTH OF THE INVASIVE ALIEN SPECIES OF COREOPSIS LANCEOLATA

作　　者：曾建军[1] 周兵[1] 邱洪龙 ZENG Jian-jun;ZHOU Bing;QIU Hong-long(School of Life Sciences,Jinggangshan University,Ji＇an,Jiangxi 343009,China)

机构地区：[1]井冈山大学生命科学学院,江西吉安343009

出　　处：《井冈山大学学报（自然科学版）》2018年第5期44-49,共6页Journal of Jinggangshan University (Natural Science)

基　　金：国家自然科学基金项目(31760123)资助

摘　　要：以剑叶金鸡菊种子为材料,分析不同光照强度(100%光强、30%光强、黑暗)和剑叶金鸡菊的凋落物及根茎浸提液3个浓度梯度(0.005、0.025、0.125g·m L-1)处理下的种子发芽率和幼苗生长差异。结果表明:剑叶金鸡菊种子无论在全光照还是黑暗条件下,发芽率无显著差异。但是与全光照条件相比,30%光照和全黑暗培养条件下对幼苗的生长抑制作用极显著影响。剑叶金鸡菊凋落物和根茎浸提液均极显著抑制种子萌发和幼苗的生长。在种群郁闭作用、凋落物分解物和根茎分泌物的自毒作用综合效应下,剑叶金鸡菊种群内种子萌发和实生苗的生长受到抑制,种内竞争减少。In the present study, effects of light and water extraction from litter and rhizome on the seed germination and seedling growth of the invasive alien species of Coreopsis lanceolata were studied. The results showed that the light intensity had no significant influence on the parameters of the seed germination, however, the seedling fresh weigh under 30% illumination and darkness was significantly lower than that under 100% illumination. Furthermore, results also revealed that water extraction from litter or rhizome significantly inhibited the seed germination and seedling growth. Under the integrated effects of population closure and the autotoxicity of litter and root exudates, the seed germination and seedling growth were significantly inhibited in C. lanceolata population, and the intraspecific competition decreased.

关 键 词：入侵植物 剑叶金鸡菊 种子 光强 自毒作用 

分 类 号：Q945.34[生物学—植物学]