Bioaccumulation of Heavy Metals in Mangrove (Avicennia marina): Predictive Uptake Modeling and Phytoremediation Potential

IF 3.4 3区 农林科学 Q2 ENVIRONMENTAL SCIENCES
Amal S. Dajam, Amr E. Keshta, Ahmed A. Bindajam, Ebrahem M. Eid
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Abstract

Globally, mangrove forests have been impacted by several environmental stressors including overloading with heavy metal pollution. The objective of the current study was to develop a predictive model for estimating heavy metal accumulation at Avicennia marina populations based on sediment characteristics. A transect (170 km) along Saudi Arabia’s southern coast of the Red Sea was selected and three major regions were sampled, and both sediment and plant organs (aerial roots, stems, and leaves) were collected. For both sediment and plant materials, the following metals (mg kg−1) were analyzed: Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, and Zn. Metal Bioaccumulation Factors (BAFs) and Translocation Factors (TFs) were calculated. Moreover, model efficiency (ME) and validation parameters were calculated including coefficient of determination (R2), mean normalized average error (MNAE), and mean normalized bias (MNB). On average, A. marina sediment was moderately to heavily polluted with Pb and Zn (311.2 ± 56.34 and 141.9 ± 19.11 mg kg−1, respectively). Cu, Zn, Mo, Cr, and Pb were translocated from A. marina’s aerial roots to the stems (TF > 1), while Cr, Cu, Zn, Fe, Mo, and Co were translocated from A. marina’s aerial roots to the leaves (TF > 1). The statistical analysis using t-tests showed no significant differences between the observed heavy metal contents and the model-estimated contents within the mangrove's leaves, stems (except for Cd), and aerial roots. Our predictive model to estimate heavy metals in different tissues of A. marina based on sediment characteristics was significantly valid (with exception for stem Cd content). Our results confirm the efficacy of A. marina as a bioindicator of toxic metal for monitoring pollution and application of A. marina as a natural phytoremediation tool.

Abstract Image

重金属在红树林(Avicennia marina)中的生物累积:预测性吸收模型和植物修复潜力
在全球范围内,红树林受到多种环境压力的影响,其中包括超负荷的重金属污染。本研究的目的是根据沉积物特征开发一个预测模型,用于估算重金属在 Avicennia marina 种群中的积累情况。研究人员沿沙特阿拉伯红海南部海岸选择了一条横断面(170 公里),并在三个主要区域取样,同时采集了沉积物和植物器官(气生根、茎和叶)。对沉积物和植物材料中的以下金属(毫克/千克-1)进行了分析:镉、钴、铬、铜、铁、锰、钼、镍、铅和锌。计算了金属生物累积系数(BAFs)和转移因子(TFs)。此外,还计算了模型效率(ME)和验证参数,包括判定系数(R2)、平均归一化平均误差(MNAE)和平均归一化偏差(MNB)。平均而言,藻类沉积物的铅和锌含量为中度至重度污染(分别为 311.2 ± 56.34 和 141.9 ± 19.11 mg kg-1)。Cu、Zn、Mo、Cr 和 Pb 从 A. marina 的气生根转移到茎(TF > 1),而 Cr、Cu、Zn、Fe、Mo 和 Co 则从 A. marina 的气生根转移到叶(TF > 1)。使用 t 检验进行的统计分析显示,在红树林的叶、茎(镉除外)和气生根中,观察到的重金属含量与模型估计的含量之间没有显著差异。我们根据沉积物特征估算红树不同组织中重金属含量的预测模型明显有效(茎镉含量除外)。我们的研究结果证实了金盏花作为有毒金属生物指示剂在监测污染方面的功效,以及金盏花作为天然植物修复工具的应用。
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来源期刊
Journal of Soil Science and Plant Nutrition
Journal of Soil Science and Plant Nutrition Agricultural and Biological Sciences-Soil Science
CiteScore
5.90
自引率
10.30%
发文量
331
审稿时长
9 months
期刊介绍: The Journal of Soil Science and Plant Nutrition is an international, peer reviewed journal devoted to publishing original research findings in the areas of soil science, plant nutrition, agriculture and environmental science. Soil sciences submissions may cover physics, chemistry, biology, microbiology, mineralogy, ecology, pedology, soil classification and amelioration. Plant nutrition and agriculture submissions may include plant production, physiology and metabolism of plants, plant ecology, diversity and sustainability of agricultural systems, organic and inorganic fertilization in relation to their impact on yields, quality of plants and ecological systems, and agroecosystems studies. Submissions covering soil degradation, environmental pollution, nature conservation, and environmental protection are also welcome. The journal considers for publication original research articles, technical notes, short communication, and reviews (both voluntary and by invitation), and letters to the editor.
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