摘要
鄂北岗地是国家重要的粮食主产区之一,但该区域也是湖北降水量最少的地区,水质污染严重。为缓解鄂北水资源短缺和污染问题,2015年湖北投资180亿实施了鄂北水资源配置工程,但目前对受水区相关水库的污染现状缺乏了解,对其碳、氮、磷污染历史缺乏认识。选择鄂北典型受水水库——熊河水库,利用沉积物^(210)Pb和^(137)Cs定年方法建立熊河水库建库以来坝前沉积物样品的年代序列,并结合沉积物理化分析和流域人口、国内生产总值(GDP)和粮食产量的数据,重建了人类活动与经济发展对熊河水库水环境的影响,结果表明在熊河水库采集的34 cm沉积物柱芯(命名为XHS)的沉积历史约66年(1953~2019年),平均沉积速率为0.66 cm/a;沉积物柱芯XHS的总有机碳含量为0.57%~1.56%,总氮含量为0.32~1.84 g/kg,总磷含量为0.97~1.91 g/kg。沉积物柱芯XHS的总有机碳含量与熊河水库流域人口数量、GDP和粮食产量的变化呈显著正相关,总氮与熊河水库流域粮食产量的变化呈显著正相关。沉积柱XHS中TP与Fe/Al-P、Ca-P、IP和OP呈正相关。在1999年之前,人类活动导致TP和各形态磷呈现上升的趋势。沉积速率与熊河水库流域人口数量、GDP和粮食产量的变化呈显著正相关。沉积物柱芯XHS的碳/氮比值(C/N)进一步表明沉积物有机碳在1981~1996和2012~2019年这两个时期主要来源于浮游植物,在1963~1970和2006~2009年这两个时期来源于浮游植物和陆生植物的混合输入。
The hilly region of northern Hubei is one of the main grain producing areas in China.However,it is characterized with lower rainfall and more polluted water quality.To alleviate water shortage and pollution problems in northern Hubei,Hubei province invested 18 billion to implement the North Hubei Water Resources Transfer Project in 2015.However,there is a lack of understanding of current pollution status of the relevant reservoirs in the receiving area and a lack of knowledge of their carbon,nitrogen and phosphorus pollution history.In this study,a typical receiving reservoir in northern Hubei,Xionghe Reservoir,was selected to establish the chronological sequence of sediment since the construction of Xionghe Reservoir using the sediment^(210)Pb and^(137)Cs dating methods,and to reconstruct the effects of human activities and economic development on Xionghe Reservoir since its construction by combining sediment physicochemical analysis and data on population size,Gross Domestic Product(GDP)and grain output in the basin.The results showed that the deposition history of the 34 cm sediment cores XHS(named XHS)of Xionghe Reservoir was about 66 years,spanning 1953-2019,with an average deposition rate of 0.66 cm/a.The total organic carbon content of sediment ranged from 0.57%to 1.56%,total nitrogen content from 0.32 to 1.84 g/kg,and total phosphorus content from 0.97 to 1.91 g/kg.The vertical distribution characteristic of total organic carbon of sediment showed significant positive correlation with the changes of population size,GDP and grain output in Xionghe Reservoir,and the total nitrogen showed significant positive correlation with the changes of grain output in Xionghe Reservoir.TP was positively correlated with Fe/Al-P,Ca-P,IP and OP in the sediment column XHS.Human activities resulted in an increasing trend of TP content and different forms of phosphorus before 1999.Deposition rate showed significant positive correlation with changes in population size,GDP and grain output in Xionghe Reservoir.The vertical dist
作者
刘伟
晏志伟
高健
罗存华
杨家香
万亮
费强
LIU Wei;YAN Zhi-wei;GAO Jian;LUO Chun-hua;YANG Jia-xiang;WAN Liang;FEI Qiang(Key Laboratory of Ecological Remediation of Lakes and Rivers and Algal Utilization of Hubei Province,School of Civil and Environment,Hubei University of Technology,Wuhan 430068,China;Xiangyang Bureau of Hydrological and Water Resources Survey of Hubei Province,Xiangyang 441003,China)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2023年第6期1208-1219,共12页
Resources and Environment in the Yangtze Basin
基金
湖北省水利重点科研项目(HBSLKY202014,HBSLKY201905)。
