百里香无性系的克隆生长特征

doi:10.17521/cjpe.2007.0081

摘要/Abstract

摘要：

植物克隆生长及其与生态适应性的关系是当今植物种群生态学研究的热点和前沿课题,但目前小半灌木克隆生长的研究开展不多。百里香(Thymus serpyllum var. asiaticus)是一种具有地面匍匐茎的草本状小半灌木,可在土壤侵蚀剧烈、基岩大面积裸露的砒砂岩区形成百里香单优群落,在维持生态系统稳定方面具有重要的生态学作用。皇甫川流域是砒砂岩大面积分布的典型区域,在这一地区对百里香无性系的克隆生长进行研究,不仅具有重要的学术价值,而且在生态环境建设方面也具有一定的现实意义。在皇甫川流域选择含三级分株的百里香无性系,对其各级分株的总生物量、各构件生物量及数量、各构件生物量占总生物量的百分比及其月变化进行了研究。结果表明: 1)母株与子代相比,在总生物量、构件生物量及数量上占有绝对优势,而且具有体型大、结构复杂的特点; 2)对生物量分配格局的研究显示,母株根的生物量在总生物量中所占的比例最大,其叶所占的比例较低。子代叶的生物量在总生物量中所占的比例最大,其根所占的比例较低;3)不同级别分株在生物量分配上的差异,揭示了相互连接的分株在功能上的差别,母株可能更侧重于养分和水分的吸收,子株则更侧重于光合生产;4)构件枝、茎、花生物量分配比月变化显示,子1代各构件的生长规律与母株的基本一致,子2代与母株和子1代的相比差异较大,分析认为这可能是分株间不同程度的生理整合作用造成的结果。

关键词: 无性系, 分株, 百里香, 生物量分配格局, 皇甫川流域

Abstract:

Aims The relationship between clonal growth and ecological adaptation is a central issue in clonal plant population ecology, but few studies have examined of growth patterns of small half-shrubs. Thymus serpyllum var. asiaticus is a dwarf half-shrub with creeping stems. Soil erosion is a serious problem in the “pisha"-sandstone area, such as the Huangfuchuan watershed, where T. serpyllum var. asiaticus can form a mono-dominant community and help maintain ecosystem stability. Understanding clonal growth characteristics of T. serpyllum var. asiaticus, therefore, is potentially helpful for vegetation restoration in this area.
Methods We sampled T. serpyllum var. asiaticus clones consisting of mother, daughter and granddaughter ramets from May to September 2004 in Huangfuchuan watershed. For each clone, we counted numbers of roots, stems and branches and measured biomass of roots, stems, branches, leaves and flowers. We examined monthly changes in biomass allocation of the different ramets.
Important findings Compared with the daughter and granddaughter ramets, the mother ramets of T. serpyllum var. asiaticus were bigger with more complex structure, biomass and number of modules. Mother ramets had largest biomass allocation to roots and much smaller to leaves. For the daughter and granddaughter ramets, biomass allocation to leaves was largest and that to roots was smaller. Differences in biomass allocation patterns between mother and daughter (and granddaughter) ramets may reflect different ramet functions. Mother ramets may be specialized for water and nutrient absorption, while daughter and granddaughter ramets may be specialized for photosynthesis, a phenomenon called `division of labor'. According to changes in biomass allocation to branches, stems and flowers from May to September, the module growth of mother and daughter ramets was similar, but differed from that of granddaughter ramets. Findings may reflect different physiological integrations of ramets.

Key words: clone, ramet, Thymus serpyllum var. asiaticus, biomass allocation pattern, Huangfuchuan watershed

张颖, 贾志斌, 杨持. 百里香无性系的克隆生长特征. 植物生态学报, 2007, 31(4): 630-636. DOI: 10.17521/cjpe.2007.0081

ZHANG Ying, JIA Zhi-Bin, YANG Chi. CLONAL GROWTH CHARACTERISTICS OF THYMUS SERPYLLUM VAR. ASIATICUS. Chinese Journal of Plant Ecology, 2007, 31(4): 630-636. DOI: 10.17521/cjpe.2007.0081

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2007.0081

https://www.plant-ecology.com/CN/Y2007/V31/I4/630

图/表 8

参考文献 16

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	母株 Mother ramet			子1代 Daughter ramet			子2代 Granddaughter ramet
	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N
根生物量Biomass of roots (g)	0.442 9^a	0.038 9	110	0.195 4^b	0.028 9	102	0.115 4^b	0.018 8	104
茎生物量Biomass of stems (g)	0.370 0^a	0.047 1	107	0.189 4^b	0.021 1	107	0.113 4^b	0.016 3	104
叶生物量Biomass of leaves (g)	0.331 6^a	0.027 2	104	0.265 1^b	0.027 9	107	0.197 9^b	0.027 1	105
枝生物量Biomass of branches (g)	0.228 9^a	0.020 8	106	0.170 5^b	0.018 9	105	0.125 6^b	0.017 9	100
花生物量Biomass of flowers (g)	0.028 0^a	0.005 1	99	0.021 1^a	0.004 3	103	0.017 2^a	0.005 7	102
总生物量Total biomass (g)	1.414 9^a	0.117 5	91	0.819 0^b	0.085 2	89	0.563 7^b	0.082 6	88

	母株 Mother ramet			子1代 Daughter ramet			子2代 Granddaughter ramet
	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N
根生物量Biomass of roots (g)	0.442 9^a	0.038 9	110	0.195 4^b	0.028 9	102	0.115 4^b	0.018 8	104
茎生物量Biomass of stems (g)	0.370 0^a	0.047 1	107	0.189 4^b	0.021 1	107	0.113 4^b	0.016 3	104
叶生物量Biomass of leaves (g)	0.331 6^a	0.027 2	104	0.265 1^b	0.027 9	107	0.197 9^b	0.027 1	105
枝生物量Biomass of branches (g)	0.228 9^a	0.020 8	106	0.170 5^b	0.018 9	105	0.125 6^b	0.017 9	100
花生物量Biomass of flowers (g)	0.028 0^a	0.005 1	99	0.021 1^a	0.004 3	103	0.017 2^a	0.005 7	102
总生物量Total biomass (g)	1.414 9^a	0.117 5	91	0.819 0^b	0.085 2	89	0.563 7^b	0.082 6	88

	母株 Mother ramet			子1代 Daughter ramet			子2代 Granddaughter ramet
	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N
生殖枝的数量Numbers of branches with flowers	4.5^a	0.7	110	2.4^b	0.5	110	1.8^b	0.5	109
营养枝的数量Numbers of branches without flowers	33.5^a	3.9	110	15.8^b	2.2	110	12.9^b	1.9	109
根的数量Numbers of roots	4.6^a	0.7	110	3.1^b	0.3	110	2.9^b	0.2	109
茎长Length of stems(cm)	52.24^a	5.50	110	16.90^b	1.87	110	12.60^b	1.64	109
茎条数Numbers of stems	4.2^a	0.4	110	1.6^b	0.1	110	1.4^b	0.1	109

	母株 Mother ramet			子1代 Daughter ramet			子2代 Granddaughter ramet
	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N
生殖枝的数量Numbers of branches with flowers	4.5^a	0.7	110	2.4^b	0.5	110	1.8^b	0.5	109
营养枝的数量Numbers of branches without flowers	33.5^a	3.9	110	15.8^b	2.2	110	12.9^b	1.9	109
根的数量Numbers of roots	4.6^a	0.7	110	3.1^b	0.3	110	2.9^b	0.2	109
茎长Length of stems(cm)	52.24^a	5.50	110	16.90^b	1.87	110	12.60^b	1.64	109
茎条数Numbers of stems	4.2^a	0.4	110	1.6^b	0.1	110	1.4^b	0.1	109

	母株 Mother ramet			子1代 Daughter ramet			子2代 Granddaughter ramet
	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N	平均数 Mean	标准误 SE	样本数 N
根生物量分配Allocation to roots(%)	31.88^a	1.53	91	22.46^b	1.23	89	19.66^b	1.14	88
茎生物量分配Allocation to stems(%)	24.50^a	1.46	91	23.47^a	1.26	89	21.67^a	1.45	88
叶生物量分配Allocation to leaves(%)	24.43^a	1.14	91	31.56^b	1.31	89	34.36^b	1.50	88
枝生物量分配Allocation to branches(%)	17.23^a	0.91	91	20.17^ab	1.20	89	22.11^b	1.54	88
花生物量分配Allocation to flowers(%)	1.96^a	0.35	91	2.34^a	0.38	89	2.19^a	0.50	88