Qin Jifa, Yang Jisong, Zhang Jiapeng, Liu Xue, Yu Junbao, Wang Zhikang, Li Yunzhao, Guan Bo, Wang Xuehong, Zhao Wei
Institute for Advanced Study in Coastal Ecology, School of Resource and Environmental Engineering, Ludong University, Yantai, China.
Institute for Advanced Study in Coastal Ecology, School of Resource and Environmental Engineering, Ludong University, Yantai, China; Dongying Academy of Agricultural Sciences, Dongying, China.
Sci Total Environ. 2024 Apr 20;922:171360. doi: 10.1016/j.scitotenv.2024.171360. Epub 2024 Feb 29.
Phosphorus (P) forms in soil are related to the P cycle and play an important role in maintaining the productivity and function of wetlands. Tidal hydrology is a key factor controlling soil P forms in estuary wetlands; however, the response of soil P forms to tidal hydrological changes remains unclear. A translocation experiment in the Yellow River Estuary wetland was conducted to study the effect of hydrological changes on P forms in the soil, in which freshwater marsh soils in the supratidal zone were translocated to salt marshes in different intertidal zones (up-high-tidal zone, high-tidal zone, and middle-tidal zone). Over a 23-month experiment, soil properties showed varying changes under different tidal hydrology conditions, with an increase in pH, salinity, Ca and salt ions and a decrease in iron oxide and nutrients. Compared with the control, the content of different forms of phosphorus (total phosphorus, inorganic phosphorus, organic phosphorus, and calcium-bound phosphorus) in the cultured soil cores decreased from 3.3 % to 67.0 % in the intertidal zones, whereas the content of ferrum‑aluminum-bound phosphorus increased from 58.9 % to 65.1 % at the end of the experiment. According to the partial least squares structural equation model, P forms are influenced by tidal hydrology mainly through the mediation of salt ions and nutrient levels. These results suggest that seawater intrusion promotes the release of P in the supratidal zone soil of estuary wetlands.
土壤中磷的形态与磷循环相关，对维持湿地生产力和功能具有重要作用。潮汐水文是控制河口湿地土壤磷形态的关键因素；然而，土壤磷形态对潮汐水文变化的响应仍不清楚。在黄河口湿地开展了一项迁移实验，以研究水文变化对土壤磷形态的影响，即将潮上带的淡水沼泽土壤迁移至不同潮间带（高潮上带、高潮带和中潮带）的盐沼中。在为期23个月的实验中，不同潮汐水文条件下土壤性质呈现出不同变化，pH值、盐度、钙和盐分离子增加，铁氧化物和养分减少。与对照相比，培养土柱中不同形态磷（总磷、无机磷、有机磷和钙结合磷）的含量在潮间带下降了3.3%至67.0%，而铁铝结合磷的含量在实验结束时从58.9%增加到65.1%。根据偏最小二乘结构方程模型，磷形态主要通过盐离子和养分水平的介导受潮汐水文影响。这些结果表明，海水入侵促进了河口湿地潮上带土壤中磷的释放。
