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Water temperature exhibits an overwhelming effects on the spatial allocation of sediment phosphorus fractions in the permanent backwater area of the Three Gorges Reservoir, China
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123177
Daoxi Zhang, Zhiyong Zhang, Jan-Peter Muller, Liming Zhu, Sanfeng Zhang, Ji Wan, Fang Shi, Xi Zou, Yulong Shi
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123177
Daoxi Zhang, Zhiyong Zhang, Jan-Peter Muller, Liming Zhu, Sanfeng Zhang, Ji Wan, Fang Shi, Xi Zou, Yulong Shi
The upstream cascade reservoirs and the implementation of water and soil conservation practices have effectively mitigated sediment inflow to the Three Gorges Reservoir (TGR) since it is been fully operational in 2010, yet the total deposited sediments and algal blooms in its tributaries were reported to have increased during the post-TGR period. To understand the spatial distribution characteristics of the deposited fractional phosphorus in sediments and its influencing factors, the column sediment and overlying water datasets from field campaigns were investigated through the multivariate statistical approaches of Partial Triadic Analysis (PTA) and Redundancy Analysis (RDA). The results revealed that fractional phosphorus within the top 20 cm of the column sediment exhibited a distinct vertical structure, and the mean contents of total phosphorus (TP), inorganic phosphorus (Inorg-P) and calcium-bound phosphorus (Ca-P) were significantly higher than that measured in the deeper layer. Additionally, fractional phosphorus in the mainstream and estuary sections were characterised by longitudinal distribution patterns. Inorg-P and Ca-P were prevalent in the upstream reaches, while the organic phosphorus (Org-P) and iron-aluminum-bound phosphorus (Fe/Al-P) were enriched in the lower mainstream and estuary regions. Sediment TP reached the highest level in the middle river reach. Multivariate regression of the RDA and variance partitioning indicate that environmental factors of the overlying water were significantly correlated with surface sediment phosphorus levels (, ). The physicochemical variables, particularly water temperature, showed an overwhelming effect on the spatial allocation of sediment phosphorus fractions than water phosphorus measured during the flood season. The identified feature of sediment fractional phosphorus indicates that nutrients introduced from the mainstream to tributaries through the backwater intrusion must be paid attention to before the implementation of the flood operation approach for algal bloom mitigation, and the biomanipulation-based scheme might be promising measure to improve water quality in the TGR tributaries.
中文翻译:
水温对三峡水库永久回水区沉积物磷组分空间分配具有压倒性影响
自 2010 年三峡水库 (TGR) 全面投入运营以来,上游梯级水库以及水土保持措施的实施有效地减少了沉积物流入三峡水库 (TGR),但据报道,在 TGR 后时期,其支流的总沉积沉积物和藻华有所增加。为了解沉积物中沉积部分磷的空间分布特征及其影响因素,通过部分三元分析 (PTA) 和冗余分析 (RDA) 的多元统计方法研究了来自野外活动的柱状沉积物和上覆水数据集。结果表明:柱状沉积物顶部 20 cm 内的分数磷表现出明显的垂直结构,总磷 (TP) 、无机磷 (Inorg-P) 和钙结合磷 (Ca-P) 的平均值含量显著高于更深层的测定值。此外,主流和河口部分的磷分数以纵向分布模式为特征。Inorg-P 和 Ca-P 在上游地区普遍存在,而有机磷 (Org-P) 和铁铝结合磷 (Fe/Al-P) 在下游主流和河口地区富集。泥沙 TP 在中游河段达到最高水位。RDA 的多元回归和方差划分表明,上覆水的环境因素与表层沉积物磷水平显著相关 ( , )。 与汛期测得的水磷相比,物理化学变量,特别是水温,对沉积物磷组分的空间分配产生了压倒性的影响。沉积物部分磷的确定特征表明,在实施防洪操作方法以减轻藻华之前,必须注意通过回水入侵从主流引入支流的营养物质,基于生物操纵的方案可能是改善 TGR 支流水质的有前途的措施。
更新日期:2025-01-28
中文翻译:
水温对三峡水库永久回水区沉积物磷组分空间分配具有压倒性影响
自 2010 年三峡水库 (TGR) 全面投入运营以来,上游梯级水库以及水土保持措施的实施有效地减少了沉积物流入三峡水库 (TGR),但据报道,在 TGR 后时期,其支流的总沉积沉积物和藻华有所增加。为了解沉积物中沉积部分磷的空间分布特征及其影响因素,通过部分三元分析 (PTA) 和冗余分析 (RDA) 的多元统计方法研究了来自野外活动的柱状沉积物和上覆水数据集。结果表明:柱状沉积物顶部 20 cm 内的分数磷表现出明显的垂直结构,总磷 (TP) 、无机磷 (Inorg-P) 和钙结合磷 (Ca-P) 的平均值含量显著高于更深层的测定值。此外,主流和河口部分的磷分数以纵向分布模式为特征。Inorg-P 和 Ca-P 在上游地区普遍存在,而有机磷 (Org-P) 和铁铝结合磷 (Fe/Al-P) 在下游主流和河口地区富集。泥沙 TP 在中游河段达到最高水位。RDA 的多元回归和方差划分表明,上覆水的环境因素与表层沉积物磷水平显著相关 ( , )。 与汛期测得的水磷相比,物理化学变量,特别是水温,对沉积物磷组分的空间分配产生了压倒性的影响。沉积物部分磷的确定特征表明,在实施防洪操作方法以减轻藻华之前,必须注意通过回水入侵从主流引入支流的营养物质,基于生物操纵的方案可能是改善 TGR 支流水质的有前途的措施。