鄱阳湖流域人类活动净磷输入时空差异

Spatio-temporal Pattern of Net Anthropogenic Phosphorus Inputs in the Poyang Lake Basin

人类活动是流域环境磷营养盐的主要来源,其导致的磷输入严重影响水环境质量,明确流域人类活动净磷输入(NAPI)驱动因素是实施有效管理措施的关键。该研究系统考虑“五河一湖”,全面分析鄱阳湖流域及其子流域NAPI时空差异以及直接驱动因素。研究发现1990-2019年期间,鄱阳湖全流域及其子流域NAPI整体呈增加趋势,空间降序分布为修河流域、环鄱阳湖区、信江流域、抚河流域、赣江流域、饶河流域。修河流域和环湖区对鄱阳湖流域NAPI增加的长期影响显著,2012年后来自赣江流域的磷压力增加了30%。受农业集约化发展影响,化肥磷输入(Pfer)对鄱阳湖流域及其子流域NAPI的驱动由辅助作用演变为主导作用,Pfer占NAPI 60%以上。该研究可为鄱阳湖生态区水环境防控和健康发展策略提供重要参考。

Human activities are the main source of phosphorus(P)in the environment,the intensification of net anthropogenic P inputs(NAPI)profoundly affects water environmental quality.The key question is identifying the driving factors of NAPI to implementing effective management measures.We comprehensively analyzed the spatio-temporal differences and direct driving factors of NAPI in Poyang Lake basin under systematically considering“Five Rivers and Poyang Lake”.This study found that the NAPI variety of the Lake basin and its sub-basins showed an increasing trend during 1990-2019,and the descending order of spatial distribution were Xiuhe basin,Poyang Lake area,Xinjiang basin,Fuhe basin,Ganjiang basin,Raohe basin.The increase of NAPI in the Poyang Lake basin is mainly affected by the Xiuhe basin and the around lake area,and the impact from the Ganjiang basin has increased 30%after 2012.The auxiliary driving of Pfer on NAPI evolved to a dominant role due to intensive development of agriculture in Poyang Lake basin,the Pfer accounts for over 60%of NAPI.This study provides an important reference for the water environment prevention and control and healthy development strategy of Poyang Lake Ecological Area.