短期增温对克隆植物剑叶金鸡菊生长及生物量的影响  

Short-term effects of warming on growth and biomass of clonal plant Coreopsis lanceolata

作　　者：黄海裙 李晓红[2] 胡雪华[2] 周兵[2] 黄国勤[1] 

机构地区：[1]江西农业大学生态科学研究中心,南昌330045 [2]井冈山大学生命科学学院,江西吉安343009

出　　处：《生态科学》2015年第2期22-26,共5页Ecological Science

基　　金：国家自然科学基金项目(31360099);江西省生物多样性与生态工程重点实验室;江西省生物学高水平学科

摘　　要：剑叶金鸡菊(Coreopsis lanceolata)原产北美,作为观赏植物传入我国,被列为有害外来入侵物种。采用开顶式生长室(OTC)模拟增温的方法,研究了剑叶金鸡菊在增温条件下其形态特征、克隆分株数、生物量及生物量分配的响应。结果表明:受短期增温的影响,剑叶金鸡菊的叶片数显著增加85.38%,株高、叶片长、叶片宽及克隆分株数均没有显著差异。地上生物量的积累在增温后显著增加21.86%,但增温后地下生物量及根冠比与对照相比没有显著差异。增温对剑叶金鸡菊的地上生物量分配及地下生物量分配有显著影响,地上生物量分配显著增加,地下生物量显著减少。综合上述结果可知短期增温促进了剑叶金鸡菊的生长及生物量的积累,但增温导致土壤水分的降低限制了根系的生长,使生物量更多分配给地上部分,利于植物生长,增强其入侵能力。Coreopsis lanceolata is native to North America, and is introduced to China as an ornamental, which has been listed as harmful invasive species. To assess the effects of short-ternx warming on morphological characteristics, number of clonal rarnets, biomass and biomass allocation of C lanceolata, a simulation study was conducted in open-top chambers. The results showed that the leaf number increased 85.38% significantly in the influence of short-term warming; the culm height, leaf length, leaf width and number of clonal ramets had no significant difference. Above-ground biomass accumulation increased 21.86% significantly after warming, but there were no significant differences in the below-ground biomass and rnot-shoot ratio compared with the controls. Above-ground biomass allocation significantly increased and below-ground biomass allocation significantly reduced. Therefore, short- term warming promoted the growth and biomass accumulation of C. lanceolata, however, the decrease of soil water due to warming limited the growth of root, so biomass was allocated to above-ground much more, which facilitated the growth and invasion ability of C lanceolata.

关 键 词：剑叶金鸡菊 短期增温 形态特征 克隆分株 生物量 

分 类 号：Q948.112[生物学—植物学]