植物生态学报 ›› 2009, Vol. 33 ›› Issue (1): 97-107.DOI: 10.3773/j.issn.1005-264x.2009.01.011
收稿日期:
2008-03-31
接受日期:
2008-07-23
出版日期:
2009-03-31
发布日期:
2009-01-30
通讯作者:
潘庆民
作者简介:
*E-mail: pqm@ibcas.ac.cn基金资助:
TIAN Da-Shuan1, BAO Xiang2, GUAN Qi-Ge3, PAN Qing-Min1,*()
Received:
2008-03-31
Accepted:
2008-07-23
Online:
2009-03-31
Published:
2009-01-30
Contact:
PAN Qing-Min
摘要:
植物资源的生殖分配是链接进化生态学和功能生态学的纽带。该文从4个组织水平上研究了针茅属(Stipa) 3种植物克氏针茅(S. krylovii)、大针茅(S. grandis)和贝加尔针茅(S. baicalensis)的生物量生殖分配以及株丛和种群水平上可育散布体的数量和生物量。结果表明: 1) 3种针茅属植物在不同组织水平上的生物量生殖分配呈现明显分异。在株丛水平上, 克氏针茅和大针茅的株丛生物量分配到生殖枝的比例分别为44.3%和47.9%, 均显著高于贝加尔针茅的35.7%。在生殖枝水平, 克氏针茅的生殖枝生物量分配到穗器官的比例为30.3%, 显著低于大针茅的42.9%和贝加尔针茅的48.4%。在穗器官水平, 大针茅穗生物量分配到散布体的比例(63.9%)最高, 克氏针茅(49.9%)次之, 贝加尔针茅(39.1%)最低。在散布体水平, 贝加尔针茅的可育散布体生物量占散布体总生物量的比例为92.3%, 显著高于克氏针茅的67.2%和大针茅的71.3%。2) 尽管3种针茅属植物在不同组织水平上的生物量生殖分配存在显著差异, 但从最终可育散布体占株丛生物量的比例看, 克氏针茅为6.1%, 贝加尔针茅为6.3%, 大针茅为9.5%; 三者在生物量生殖分配上表现出明显的趋同效应。3) 3种针茅属植物生物量生殖分配的限制性环节存在显著差异。生殖枝向穗的生物量分配是克氏针茅和大针茅生殖分配的限制性环节, 株丛向生殖枝的生物量分配或穗器官向散布体的分配是贝加尔针茅生物量生殖分配的限制性环节。从可育散布体的数量和个体生物量看, 克氏针茅采取了倾向于拓展空间的增加散布体数量的策略, 而大针茅和贝加尔针茅逐步进化出了趋向于提高个体竞争能力的增加散布体个体生物量的策略。
田大栓, 包祥, 关其格, 潘庆民. 内蒙古草原3种针茅属植物不同组织水平的生物量生殖分配. 植物生态学报, 2009, 33(1): 97-107. DOI: 10.3773/j.issn.1005-264x.2009.01.011
TIAN Da-Shuan, BAO Xiang, GUAN Qi-Ge, PAN Qing-Min. BIOMASS REPRODUCTIVE ALLOCATION AT DIFFERENT ORGANIZATIONAL LEVELS OF THREE STIPA SPECIES IN INNER MONGOLIA GRASSLAND OF CHINA. Chinese Journal of Plant Ecology, 2009, 33(1): 97-107. DOI: 10.3773/j.issn.1005-264x.2009.01.011
图1 3种针茅属植物的株丛枝条数(A)和株丛生殖枝条数(B)(平均值±标准误差, n=50, p=0.05) Sk: 克氏针茅 Stipa krylovii Sg: 大针茅 S. grandis Sb: 贝加尔针茅 S. baicalensis a、b、c: 不同字母表示在p<0.05水平差异显著 Different letters represent significant differences at the p<0.05 level
Fig. 1 Number of tillers (A) and number of reproductive tillers (B) per plant of three Stipa species (mean±SE, n=50, p=0.05)
图2 3种针茅属植物4个组织水平的生物量(平均值±标准误差, n=50, p=0.05) A: 株丛生物量 Biomass per plant B: 株丛生殖枝生物量 Biomass of reproductive tillers per plant C: 生殖枝生物量 Biomass per reproductive tiller D: 穗生物量 Biomass per spike E: 穗散布体生物量 Biomass of diaspores per spike F: 穗可育散布体生物量 Biomass of fertilized diaspores per spike G: 可育散布体生物量 Biomass per fertilized diaspore Sk、Sg、Sb、a、b、c: 见图1 See Fig.1
Fig. 2 Biomass of three Stipa species at four organizational levels (mean±SE, n=50, p=0.05)
图3 3种针茅属植物4个组织水平的生物量生殖分配(平均值±标准误差, n=50, p=0.05) A: 株丛水平生物量生殖分配 Fraction of reproductive tiller in plant biomass B: 生殖枝水平生物量生殖分配 Fraction of spike in reproductive tiller biomass C: 穗水平生物量生殖分配 Fraction of diaspore in spike biomass D: 散布体水平生物量生殖分配 Fraction of fertilized diaspore in diaspore biomass per spike E: 株丛水平可育散布体生物量分配 Fraction of fertilized diaspore in plant biomass Sk、Sg、Sb、a、b、c: 见图1 See Fig.1
Fig. 3 Biomass reproductive allocation of three Stipa species at four organizational levels (mean±SE, n=50, p=0.05)
图4 株丛水平上3种针茅属植物的可育散布体产量和数量(平均值±标准误差, n=50, p=0.05) A: 株丛水平的可育散布体产量 Biomass of fertilized diaspores per plant B: 株丛水平的可育散布体数量 Number of fertilized diaspores per plant Sk、Sg、Sb、a、b、c: 见图1 See Fig.1
Fig. 4 Biomass and number of fertilized diaspores of three Stipa species at plant level (mean±SE, n=50, p=0.05)
图5 种群水平上3种针茅属植物的可育散布体产量和数量(平均值±标准误差, n=50, p=0.05) A: 1 m2内可育散布体的产量 Biomass of fertilized diaspores per square meter B: 1 m2内可育散布体的数量 Number of fertilized diaspores per square meter Sk、Sg、Sb、a、b、c: 见图1 See Fig.1
Fig. 5 Biomass and number of fertilized diaspores of three Stipa species at the population level (mean±SE, n=50, p=0.05)
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