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Ecological stoichiometry characteristics of carbon (C), nitrogen (N), and phosphorus (P) in plant organs and sediments of the exotic mangrove Sonneratia apetala and the native Kandelia obovata were compared, and the relationship between the ecological stoichiometry parameters of mangrove plant organs and key physico−chemical properties of sediments was examined. The C, N, and P contents in leaves, branches, roots, and the 0~1 m sediment layer were analyzed for an unvegetated mudflat, 12−year−old (SA12) and 18−year−old (SA18) S. apetala plantations, and a 40−year−old native K. obovata forest in Qi'ao Island, Zhuhai. It was shown that no significant difference in C and N contents of the same plant organ existed between the different−aged S. apetala forests. Higher P content and a lower C∶P ratio were observed in the leaves of the 12−year−old S. apetala trees compared to those of the 18−year−old trees, indicating more rapid growth in the younger stand. The SOC and N contents in the 0~20 cm sediment layer of the S. apetala forests were found to be significantly higher than those in the unvegetated mudflat. The SOC content, N content, and C∶N ratio in the 0~20 cm sediment layer of the 12−year−old S. apetala forest were found to be significantly lower than those of the 18−year−old forest. In the 0~60 cm sediment layer, the SOC and N contents, as well as the C∶N ratio, were found to be significantly lower in the S. apetala forests than in the K. obovata forest. It was indicated by correlation analysis (RDA) that sediment bulk density was the major factor affecting the ecological stoichiometry of mangrove plant organs. These findings suggest that for long−term carbon sequestration in mangrove restoration, native species like K. obovata should be prioritized; management of S. apetala plantations should be age−specific (e.g., addressing N limitation in young stands and P limitation in older stands); and the improvement of sediment physical structure (e.g., bulk density) can enhance the overall ecosystem functionality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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