摘要
针对鄱阳湖入湖负荷高和富营养化问题,该文应用AQUATOX模型对鄱阳湖的水环境进行了模拟分析,研究了在水体中叶绿素a(Chla)与入湖负荷、水体中总氮(TN)及总磷(TP)的响应关系.研究结果表明:根据相关规划,预计到2035年,湖区TN平均质量浓度将减少17.40%,TP平均质量浓度将减少39.83%,氨氮(NH_(4)^(+)-N)平均质量浓度将减少44.87%.同时,随着在湖区内营养盐的削减,Chla平均质量浓度也将随之减少20.50%.以2035年的入湖负荷为基准,模拟单独控制TN及TP负荷后水体Chla质量浓度的变化,发现削减入湖TP负荷10%的效果已接近于在削减入湖TN负荷50%时的效果;同时控制TN与TP负荷,水体Chla质量浓度的变化与单独控制TP负荷的效果相似.Chla与TN、TP呈显著的正相关关系,由于鄱阳湖处于磷限制状态,所以削减TP负荷能够有效地降低在湖区内的Chla质量浓度,从而有助于缓解湖泊的富营养化状态.
The AQUATOX model is employed to simulate and analyze the water environment of Poyang Lake,addressing issues related to high inflow loads and eutrophication are investigated.The response relationships between chlorophyll-a in the water body and inflow loads are investigated,as well as total nitrogen and total phosphorus levels in the water.The results indicate that,based on relevant plans,by 2035 the average total nitrogen concentration in the lake area is projected to decrease by 17.40%,the average total phosphorus concentration by 39.83%,and the average ammonia nitrogen concentration by 44.87%.Concurrently,with the reduction of nutrients within the lake area,the average concentration of chlorophyll-a is also expected to decrease by 20.50%.Using the 2035 inflow load as a baseline,a simulation is conducted to examine changes in chlorophyll-a concentration in response to controlling total nitrogen and total phosphorus loads individually.It is found that reducing the inflow total phosphorus load by 10%achieved effects comparable to a 50%reduction in inflow total nitrogen load.Additionally,simulta-neous control of total nitrogen and total phosphorus loads produced changes in chlorophyll-a concentration similar to those observed when controlling total phosphorus load alone.The significant positive correlation is observed between chlorophyll-a and both total nitrogen and total phosphorus,however,as Poyang Lake is in a phosphorus-limited state,reducing total phosphorus load effectively lowers chlorophyll-a concentration in the lake area,thereby contributing to alleviating the lake′s eutrophic condition.
作者
李博勤
肖梓俊
王亮
王世岩
朱长军
李步东
LI Boqin;XIAO Zijun;WANG Liang;WANG Shiyang;ZHU Changjun;LI Budong(College of Energy and Environmental Engineering,Hebei University of Engineering,Handan Hebei 056038,China;Institute of Water Ecology and Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Environmental Science and Engineering,Beijing Forestry University,Beijing 100083)
出处
《江西师范大学学报(自然科学版)》
北大核心
2025年第3期312-321,共10页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
国家自然科学基金联合基金(U2340224)资助项目.
