Stipa tenacissima Does not Affect the Foliar δ13C and δ15N of Introduced Shrub Seedlings in a Mediterranean Semi-arid Steppe |
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作者姓名: | Fernando T. Maestre Susana Bautista Jordi Cortina |
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作者单位: | [1]Departamento de Ecologfa, Universidad de Alicante, Apartado de correos 99, 03080 Alicante, Spain [2]Department of Biology, Duke University, Phytotron Building, Science Drive, Box 90340, Durham, North Carolina 27708-0340, USA [3]Centro de Estudios Ambientales del Mediterraneo, C/Charles Darwin 14, 46980 Paterna, Spain |
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基金项目: | Supported by the REDMED collaborative research project (contract number ENV4-CT97-0682).
Publication of this paper is supported by the National Natural Science Foundation of China (30424813) and Science Publication Foundation of
the Chinese Academy of Sciences. |
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摘 要: | Recent studies have shown that the tussock grass Stipa tenacissima L. facilitates the establishment of late-successional shrubs, in what constitutes the first documented case of facilitation of woody plants by grasses. With the aim of increasing our knowledge of this interaction, in the present study we investigated the effects of S. tenacissima on the foliar δ13C, δ15N, nitrogen concentration, and carbon : nitrogen ratio of introduced seedlings of Pistacia lentiscus L., Quercus coccifera L., and Medicago arborea L. in a semi-arid Mediterranean steppe. Six months after planting, the values of δ13C ranged between -26.9‰ and -29.6‰, whereas those of δ15N ranged between -1.9‰ and 2.7‰. The foliar C : N ratio ranged between 10.7 and 53.5, and the nitrogen concentration ranged between 1.0% and 4.4%. We found no significant effect of the microsite provided by S. tenacissima on these variables in any of the species evaluated. The values of δ13C were negatively correlated with predawn water potentials in M. arborea and were positively correlated with relative growth rate in Q. coccifera. The values of δ15N were positively correlated with the biomass allocation to roots in the latter species. The present results suggest that the modification of environmental conditions in the are surrounding S. tenacissima was not strong enough to modify the foliar isotopic and nitrogen concentration of shrubs during the early stages after planting.
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关 键 词: | 针茅 δ13C δ15N 引种方法 灌木 树苗 地中海 草原 |
收稿时间: | 2005-11-29 |
修稿时间: | 2005-11-292006-04-06 |
Stipa tenacissima Does not Affect the Foliar δ13C and δ15N of Introduced Shrub Seedlings in a Mediterranean Semi-arid Steppe |
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Authors: | Fernando T Maestre Susana Bautista Jordi Cortina |
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Institution: | Departamento de Ecología, Universidad de Alicante;, Apartado de correos 99, 03080 Alicante, Spain;Department of Biology, Duke University, Phytotron Building;, Science Drive, Box 90340, Durham, North Carolina 27708-0340, USA;Centro de Estudios Ambientales del Mediterráneo;, C/ Charles Darwin 14, 46980 Paterna, Spain |
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Abstract: | Recent studies have shown that the tussock grass Stipa tenacissima L. facilitates the establishment of late‐successional shrubs, in what constitutes the first documented case of facilitation of woody plants by grasses. With the aim of increasing our knowledge of this interaction, in the present study we investigated the effects of S. tenacissima on the foliar δ13C, δ15N, nitrogen concentration, and carbon : nitrogen ratio of introduced seedlings of Pistacia lentiscus L., Quercus coccifera L., and Medicago arborea L. in a semi‐arid Mediterranean steppe. Six months after planting, the values of δ13C ranged between ?26.9‰ and ?29.6‰, whereas those of δ15N ranged between ?1.9‰ and 2.7‰. The foliar C : N ratio ranged between 10.7 and 53.5, and the nitrogen concentration ranged between 1.0% and 4.4%. We found no significant effect of the microsite provided by S. tenacissima on these variables in any of the species evaluated. The values of δ13C were negatively correlated with predawn water potentials in M. arborea and were positively correlated with relative growth rate in Q. coccifera. The values of δ15N were positively correlated with the biomass allocation to roots in the latter species. The present results suggest that the modification of environmental conditions in the are surrounding S. tenacissima was not strong enough to modify the foliar isotopic and nitrogen concentration of shrubs during the early stages after planting. (Managing editor: Ya‐Qin Han) |
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Keywords: | facilitation Medicago arborea Pistacia lentiscus Quercus coccifera stable isotopes steppe Stipa tenacissima |
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