| 摘要: |
| 本研究分析了九龙江口红树植物秋茄(Kandelia obovata)和桐花树(Aegiceras corniculatum)，以及盐沼植物互花米草(Spartina alterniflora)和短叶茳芏(Cyperus malaccensis)不同状态(成熟、衰老和腐烂)叶片中脂肪酸组成及相对含量。结果共检测出20种脂肪酸，其中9种存在于所有样品中。样品中含量最高的饱和脂肪酸均为棕榈酸C16:0 (21.76%～39.55%)，其次是硬脂酸C18:0 (4.98%～29.88%)；不饱和脂肪酸主要有油酸C18:1n9 (2.04%～12.90%)、亚油酸C18:2n6 (8.25%～24.69%)和C20:1n9 (1.64%～40.45%)。红树植物和盐沼样品中的脂肪酸组成存在差异，C30:0为红树植物的特征脂肪酸。在植物衰老和腐烂的样品中的脂肪酸组成与新鲜成熟样品存在差异，C20:1n9在衰老的样品中出现明显的下降，而相比红树植物两种盐沼植物的C20:1n9含量则下降更快。研究结果表明，总体上湿地植物在衰老和腐烂后不饱和脂肪酸占脂肪酸的比例明显下降，而必需脂肪酸C18:2n6的水平则未出现升高。 |
| 关键词: 海洋生物学 红树 盐沼植物 脂肪酸 衰老 腐烂 |
| DOI：10.3969/J.ISSN.2095-4972.2021.04.007 |
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| 基金项目:国家重点研究计划资助项目(2017YFC0506101)；自然资源部第三海洋研究所基本科研业务费专项资金资助项目(2019017) |
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| Comparison of fatty acid compositions between mangrove and salt marsh plants in different stages |
| XIE Limei,WU Zhiqiang,CHEN Bin,CHEN Shunyang,CHEN Guangcheng |
| (Third Institute of Oceanography, MNR, Xiamen 361005, China; College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;Third Institute of Oceanography, MNR, Xiamen 361005, China; Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration, Xiamen 361005, China) |
| Abstract: |
| The compositions and relative abundances of fatty acids in samples of two mangrove species (Kandelia obovata and Aegiceras corniculatum) and two saltmarsh species (Spartina alterniflora andCyperus malaccensis) in different stages of the matured, senescent and decomposed were compared in Jiulong River Estuary in South China. A total of 20 fatty acids were measured, nine of which were commonly found in all samples. The most abundant saturated fatty acid was palmic acid (C16:0, 21.76%-39.55%), followed by octadecoic acid (C18:0, 4.98%-29.88%). Unsaturated fatty acid mainly comprised oleic acid (2.04%-12.90%), linolic acid (8.25%-24.69%) and 9-eicosenoic acid (1.64%-40.45%). The mangrove and salt marsh species had a different fatty acid composition in the samples and C30:0 was the biomarker of mangrove species. There was also a difference in the fatty acid composition of the senescent and decomposed samples relative to that of mature samples. C20:1n9 was higher in mature samples than in senescent and decomposed samples. Salt marsh plants decreased more rapid in the senescent samples than those of mangrove samples. The results suggest that the senescent and decomposed samples of the four plants have a much lower unsaturated fatty acid level and the essential fatty acid (C18:2n6) in the samples does not increased proportionally during the senescence and decomposition of the plant tissues. |
| Key words: marine biology mangrove salt marsh plant fatty acid senescence decomposition |
