Carbon isotope composition of Phragmites australis in a constructed saline wetland

被引:46
作者
Choi, WJ [1 ]
Ro, HM
Chang, SX
机构
[1] Chonnam Natl Univ, Dept Agr & Biosyst Engn, Kwangju 500757, South Korea
[2] Chonnam Natl Univ, Inst Agr Sci & Technol, Kwangju 500757, South Korea
[3] Seoul Natl Univ, Dept Appl Biol & Environm Chem, Sch Agr Biotechnol, Seoul 151742, South Korea
[4] Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada
关键词
carbon isotope discrimination; common reed; constructed wetland; saline water; salinity stress;
D O I
10.1016/j.aquabot.2005.02.005
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
We hypothesize that salinity stress may leave a specific pattern of delta C-13 variation in common reed (Phragmites australis (Cav.) Trin. Ex Steudel), a species potentially susceptible to salinity. We measured dry weight and delta C-13 of P australis transplanted in a constructed saline wetland four times between July 2001 and May 2002. Shoot dry weight (590-3090 g m(-2)) of P. australis was negatively correlated with rhizosphere salinity. Shoot delta C-13 values (-27.1 to -23.8 parts per thousand) in the saline wetland were less negative than that of control samples (-28.7 to -28.2 parts per thousand) collected from non-saline riparian zones nearby. In addition, the delta C-13 values became less negative, indicating decreased carbon isotope discrimination, as salinity increased. These results are consistent with published gas exchange measurements that showed that salinity stress could decrease CO2 diffusion rate by reducing stomatal and/or mesophyll conductance. However, we could not preclude the possibility of growth reduction caused by salinity effects on carboxylation. We suggest that the non-destructive and time-integrating delta C-13 measurement is a useful tool in monitoring responses of P. australis to environmental conditions in saline wetlands. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:27 / 38
页数:12
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