Eco-physiological responses of the declining population Spartina anglica to N and P fertilizer addition |
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Authors: | Li Hongli Zhi Yingbiao Zhao Lei An Shuqing Deng Zif Zhou Changfang and Gu Shuping |
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Institution: | 1. Coastal Geoscience, Centre d''études Nordiques, Départment de biologie, chimie et géographie, Université du Québec à Rimouski, 300 allée des Ursulines, C.P. 3300, Rimouski, Québec G5L 3A1, Canada;2. Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Rennes Drive, Exeter, EX4 4RJ, UK;3. School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, UK;4. Environment Department, University of York, Heslington, York YO10 5NG, UK |
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Abstract: | Nitrogen and phosphorus are both important life elements. N, P and combined N-P fertilizers were added to the declining population Spartina anglica Hubbard in coastal China. Some growth parameters and eco-physiological responses of S. anglica to different fertilizer treatments (N, P and combined N-P fertilizer addition with high, medium and low levels, respectively) were measured. The fertilizer addition had a highly significant effect on the dynamics of its height-growth, number of leaves, number of roots and total biomass. Only N addition had a significant effect on leaf area and leaf thickness in all fertilizer treatments. On the dynamics of its height-growth, the effect of N addition was the most apparent, and the effect of N-P addition was not greater than those of N and P addition separately. The photosynthesis rate was enhanced and the yield was the highest with the highest N, the highest N-P and the medium P addition. The rates were higher than those of CK by 19.08 μmol·m?2·s?1, 15.47 μmol·m?2·s?1 and 11.23 μmol·m?2·s?1, respectively. The activity of SOD and POD increased with the treatments after freshwater stress for 14 days. Effects of medium N and P addition were significant for SOD activity. However, POD activity was significantly higher with the treatment of higher N and higher N-P addition. In a word, fertilizer addition improved the growth of the declining population S. anglica. The results indicated that the decline of S. anglica was correlated with the nutriment deficiency in soil, especially with the lack of N. |
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Keywords: | Spartina anglica dieback nutrient limitation height-growth eco-physiology |
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