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Pattern of seedling emergence and early growth in Avicennia germinans and Rhizophora racemosa along an experimental salinity gradient
African Journal of Ecology ( IF 1 ) Pub Date : 2021-05-15 , DOI: 10.1111/aje.12889
Corine Bitossessi Laurenda Sinsin 1, 2 , Kolawolé Valère Salako 1 , Adandé Belarmain Fandohan 1, 3 , Mahoutin Gildas Serge Zanvo 1 , Konan Edouard Kouassi 4 , Romain Lucas Glèlè Kakaï 1
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Salinity is a major driver of emergence and early growth of mangrove propagules. The magnitude of salinity effects may vary across mangrove ecotypes. Using a randomised complete block design in a semi-controlled experiment, this study assessed the effect of salinity (low: 3–5, moderate: 15–17 and high: 34–36 Practical Salinity Unit) on the emergence and early growth of Rhizophora racemosa (G.) Meyer and Avicennia germinans (L.) L., two common mangrove species in West Africa. Per cent emergence, total height and number of leaves were recorded daily for 30 days. Data were analysed using a three-parameter log-logistic distribution and linear mixed models. For both species, results showed significant effects of salinity on per cent emergence and growth variables. There was a negative correlation between salinity and per cent emergence of A. germinans and between salinity and height and number of leaves during the early growth phase of both species. However, the per cent emergence of R. racemosa was significantly higher for moderate salinity. To avoid the risk of dieback from osmotic shock after transplantation, we recommend the use of water of low or moderate salinity in nursery, depending on whether the soil salinity is low or high where the seedlings will be transplanted.

中文翻译:

沿实验盐度梯度的Avicennia Germinans和Rhizophora racemosa的幼苗出苗和早期生长模式

盐度是红树林繁殖体出现和早期生长的主要驱动力。盐度影响的程度可能因红树林生态型而异。本研究在半对照实验中使用随机完整区组设计,评估盐度(低:3-5,中:15-17,高:34-36 实际盐度单位)对根茎的出现和早期生长的影响racemosa (G.) Meyer 和Avicennia Germinans(L.) L.,西非两种常见的红树林物种。每天记录出苗百分比、总高度和叶片数,持续 30 天。使用三参数对数逻辑分布和线性混合模型分析数据。对于这两个物种,结果表明盐度对出现百分比和生长变量有显着影响。在两个物种的早期生长阶段,盐度与A.germinans的出现百分比之间以及盐度与高度和叶片数量之间存在负相关。然而,R. racemosa的出现百分比中盐度显着升高。为避免移植后因渗透性休克而枯死的风险,我们建议在苗圃中使用低盐度或中等盐度的水,具体取决于移植幼苗的土壤盐度是低还是高。
更新日期:2021-05-15
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