| 论文标题： | |
|---|---|
| 作者： | |
| 出版刊物： | |
| 出版日期： | |
| 出版年份： | |
| 卷/期： | |
| DOI： | |
| 论文摘要： | Lanthanum (La)-modified clay combined with submerged macrophytes has been widely applied to control internal phosphorus (P) loading. However, most studies focused on controlling inorganic P, with limited attention paid to the effectiveness and mechanisms of organic P (OP), especially from the perspective of rhizosphere effects. In this study, a root box simulation system was constructed, integrating microelectrode, planar-optode, 16S rRNA sequencing, and sequential OP extraction to investigate the effectiveness of La-modified attapulgite (LMA) combined with Vallisneria spiralis in controlling sediment OP and the root-mediated mechanisms involved. The results indicated that LMA combined with Vallisneria spiralis achieved significantly greater OP reductions in both overlying water (10.10 %-25.87 %) and all sediment fractions (1.94 %-25.49 %) compared to LMA capping alone. The Mantel test and Partial Least Squares Path Modeling further revealed that oxygen and organic acids secreted by Vallisneria spiralis roots played key roles in controlling sediment OP mobilization. Root oxygen release significantly boosted dissolved oxygen levels and penetration depth at the sediment-water interface by 1.16 and 3.41 times, respectively. This created favorable conditions for the growth of P-solubilizing bacteria, particularly the BD1-7 clade, subsequently accelerating the mineralization of Fulvic-OP to Labile-OP in sediments. Root-secreted organic acids lowered pH by 4.18 % in rhizosphere sediment, promoting the dissolution of Res-OP to Labile-OP. The transformed Labile-OP was absorbed by roots and LMA simultaneously, leading to a substantial decrease in sediment OP mobilization. These findings revealed the synergistic mechanisms of LMA and submerged macrophytes in efficiently remediating internal OP pollution, offering a promising solution for eutrophic waters. |
以下内容与「星空体育彩票注册福利」同属公开资讯，可按栏目接着查阅相关条目。
本站按公开材料组织页面。需要原文时请核对应栏目发布页。
若从搜索引擎进入，可先确认当前栏目名称，再按需打开相关阅读。
