Nutrient Limitation in Central Red Sea Mangroves
Nutrient Limitation in Central Red Sea Mangroves
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DOI：
10.3389/fmars.2016.00271
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发表时间：
2016-01-01
影响因子：
3.7
通讯作者：
Irigoien, Xabier
中科院分区：
文献类型：
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作者：
Almahasheer, Hanan;Duarte, Carlos M.;Irigoien, Xabier
作为可以在咸水中生存的沿海植物，红树林在大型海洋生态系统中发挥着至关重要的作用。红海红树林的生长受到阻碍，是世界上研究最少的LMEs之一。红海中部红树林的特征高度约为2米，表明营养有限。本研究对红海中部红树林林分的营养状况进行了评估，并对4周龄的Avicennia marina幼苗进行了氮、磷、铁及其不同组合的施肥试验，以确定限制养分和化学计量学效应。测定了不同时期试验幼苗的株高、叶数、节数和根系发育情况，以及叶片中C、N、P、Fe和Chl a的含量。株高、节数和叶数在不同处理间差异显著。与其他营养物相比，铁处理导致植株明显更高，这表明铁是受测红树林种群的主要限制性营养素，并证实了李比希的最小值定律：单独添加铁产生的结果与使用全肥的结果相当。这一结果与红海沉积物以碳酸盐为主的生物成因性质和缺乏河流铁源相一致。
As coastal plants that can survive in salt water, mangroves play an essential role in large marine ecosystems (LMEs). The Red Sea, where the growth of mangroves is stunted, is one of the least studied LMEs in the world. Mangroves along the Central Red Sea have characteristic heights of similar to 2 m, suggesting nutrient limitation. We assessed the nutrient status of mangrove stands in the Central Red Sea and conducted a fertilization experiment (N, P and Fe and various combinations thereof) on 4-week-old seedlings of Avicennia marina to identify limiting nutrients and stoichiometric effects. We measured height, number of leaves, number of nodes and root development at different time periods as well as the leaf content of C, N, P, Fe, and Chl a in the experimental seedlings. Height, number of nodes and number of leaves differed significantly among treatments. Iron treatment resulted in significantly taller plants compared with other nutrients, demonstrating that iron is the primary limiting nutrient in the tested mangrove population and confirming Liebig's law of the minimum: iron addition alone yielded results comparable to those using complete fertilizer. This result is consistent with the biogenic nature of the sediments in the Red Sea, which are dominated by carbonates, and the lack of riverine sources of iron.