湖泊科学2025，Vol.37Issue(6)：2036-2049,14.DOI:10.18307/2025.0624
芦苇与水烛分解过程中氮磷释放特征及影响因素
The release characteristics and influencing factors of nitrogen and phosphorus during the decomposition of Phragmites australis and Typha angustifolia
摘要
Abstract
Emergent plants can not only absorb nutrients from water and sediment as a sink during the growth period,but also re-lease nutrients such as nitrogen and phosphorus into the water environment as a source during the decline period.When the bio-mass is high,this release may lead to secondary pollution of the water body.To explore the nutrient release rule of typical emergent plants in Lake Hengshui and the microbial mechanism affecting plant decomposition,two dominant species Phragmites australis and Typha angustifolia,were selected as research subjects.In-situ decomposition experiments were conducted using the decomposition-bag method in Lake Hengshui at the end of February 2023.The"vertical decomposition"of plants was simulated in the experimen-tal group which was not in contact with the water surface,and the decomposition of emergent plants was simulated in the experi-mental group which was flooded under the water surface.The results showed that:(1)The decomposition rates of P.australis and T.angustifolia were significantly different under flooded and non-flooded conditions.Flooded conditions enhanced the decomposi-tion of P.australis and T.angustifolia,but long-term flooding might lead to the accumulation of elements.(2)The decomposition rate of T.angustifolia was faster than that of P.australis,because the decomposition rate was positively correlated with the initial N and P contents and the relative abundance of nitrogen and phosphorus cycling genes,and negatively correlated with the initial cellulose,lignin and soluble sugar contents.(3)The abundance of nitrogen-fixing genes increased gradually with the degree of de-composition,and the increase of N content in the litter of both species was positively correlated with the nitrogen-fixing genes of ni-trogen-fixing microorganisms.关键词
芦苇/水烛/腐解/挺水植物/影响因素/衡水湖Key words
Phragmites australis/Typha angustifolia/decomposition/emergent plants/influencing factors/Lake Hengshui引用本文复制引用
李子威,黄蔚,施文卿,陈开宁,刘成..芦苇与水烛分解过程中氮磷释放特征及影响因素[J].湖泊科学,2025,37(6):2036-2049,14.基金项目
中国科学院南京地理与湖泊研究所自主部署科研项目(NIGLAS2022GS03)和国家自然科学基金项目(42077310)联合资助. （NIGLAS2022GS03）
