Macrophytes are one of the main components of the aquatic ecosystem. They are used in several countries as metrics for the ecological assessment of hydrosystems. The objective of our study was to evaluate the suitability of the Macrophyte Biological Index for Rivers (IBMR) to determine a trophic level in the upper Oum Er Rbia basin (Morocco) and to understand physicochemical parameters of water that govern the distribution of macrophyte species. CCA analysis was used to relate the distribution of macrophytes to hydrochemical parameters of water. The CCA analysis shows that the distribution of macrophytes was more correlated with abiotic parameters (EC, WT and DO) than nutrient parameters (PO 4 -P, NO 3 -N, NO 2 -N, NH 3 -N and COD Mn ). The recorded values of IBMR in the upper Oum Er Rbia basin indicate that the trophic level of the studied rivers ranged from “moderate” to “very high”. Pearson's correlation coefficient showed that the IBMR is more correlated with the abiotic parameters such as WT and EC and does not show any significant correlation with the content of PO 4 -P and NH 3 -N in water, which makes the IBMR index unreliable for assessing the trophic status related to phosphate and ammonia concentrations in our lotic waters.

中文翻译：

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大型植物作为评估河流营养状况的工具：以Oum Er Rbia盆地上游为例（摩洛哥）

大型植物是水生生态系统的主要组成部分之一。它们在几个国家中用作水系生态评估的指标。我们研究的目的是评估河流大型植物生物指数（IBMR）的适用性，以确定上游Oum Er Rbia盆地（摩洛哥）的营养水平，并了解控制大型植物物种分布的水的理化参数。CCA分析用于将大型植物的分布与水的水化学参数联系起来。CCA分析表明，与营养参数（PO 4 -P，NO 3 -N，NO 2 -N，NH 3 -N和COD Mn）相比，大型植物的分布与非生物参数（EC，WT和DO）更相关。Oum Er Rbia上游盆地的IBMR记录值表明，所研究河流的营养水平范围从“中等”到“非常高”。皮尔森相关系数表明，IBMR与非生物参数如WT和EC的相关性更高，与水中PO 4 -P和NH 3 -N的含量没有任何显着相关性，这使得IBMR指数难以评估营养状态与我们的饮用水中磷酸盐和氨的浓度有关。