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首页> 外文期刊>Journal of Aquatic Sciences >ASSESSING ENVIRONMENTAL IMPACT ON AQUATIC MACROPHYTE SPECIES STRUCTURE IN A NEAR COASTAL TROPICAL RIVER, SOUTHEASTERN NIGERIA I.
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ASSESSING ENVIRONMENTAL IMPACT ON AQUATIC MACROPHYTE SPECIES STRUCTURE IN A NEAR COASTAL TROPICAL RIVER, SOUTHEASTERN NIGERIA I.

机译：评估沿海近热带热带水生宏观植物物种结构的环境影响I.

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摘要

Impact of environmental variables on distribution and composition of aquatic macrophyte community in a tropical river was assessed for one year (March 2009 to Febmary 2010). Hypothesis tested was that the spatial variation in environmental variables on the river’s longitudinal gradient affects macrophyte species assemblages. Modified method of floral collection was used with a random sampling technique. Eighteen physico-chemical parameters were sampled and analyzed using standard and analytical methods of water analysis. Generated databases obtained were subjected to statistical analyses at P>0.05 and Canonical Correspondence Analysis. Thirty-three families, 64 genera and 98 species of macrophyte were identified. Typha australis, Polygonium salicifolium, Ipomoea aqiiatica, Ludwigia stolonifera, L. abyssinia and Salvinia nymphellula clustered in sampling Stations 1, 3, 4, 5, 11, 12, 13 and 14 where transparency was highest and water level, water temperature, sulphate and biochemical oxygen demand were at their lowest levels. Phosphate-phosphorus showed positive relationship with five macrophytes species: in Stations 27, 29, 32 and 34, whereas current velocity correlated with nine macrophyte species at stations 16, 18, 19, 20,21 and 23. These species can be used as indicators since macrophyte species distributions are not considered to randomly occur but influenced by prevailing environmental conditions.
机译：在一年中（2009年3月至2010年2月）评估了环境变量对热带河流水生植物群落分布和组成的影响。检验的假设是，河流纵向梯度上环境变量的空间变化会影响大型植物物种的组合。改良的花卉采集方法与随机采样技术结合使用。使用水分析的标准方法和分析方法对18个理化参数进行采样和分析。对获得的生成的数据库进行P> 0.05的统计分析和规范对应分析。鉴定了33个科，64属和98种大型植物。香蒲，唾液白千层，番薯，轮叶路德氏菌，L. abyssinia和若虫丹参聚集在采样站1、3、4、5、11、12、13和14，其中透明度最高，水位，水温，硫酸盐和生化需氧量处于最低水平。磷酸-磷与5种大型植物呈正相关：在27、29、32和34号站，而当前速度与9种大型植物在16、18、19、20、21和23号站相关。这些物种可用作指标。因为大型植物物种的分布不被认为是随机发生的，而是受到主要环境条件的影响。

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