摘要
为了解南四湖近几年沼泽化加剧的现状及其根源,2008年8月,2009年6月,2009年8月,2010年6月和2010年8月先后多次对南四湖全湖,及21条主要入湖河道河口区进行调查和采样分析.结果表明:调查的25个样点中除微山岛保护区附近和船舶密集的界河口附近4个样点无沼泽化表征,运输繁忙的老万福河入湖口和南阳湖敞水区2个样点为轻度沼泽化外,其它样点中6个中度沼泽化,12个重度沼泽化,1个极重度沼泽化;沼泽化程度与植被类型、淤泥深度和淤泥有机质含量呈显著正相关,与pH和溶解氧呈显著负相关;而植被丰度与水深、pH和溶解氧呈显著负相关;淤积程度与TN、TP、淤泥有机质呈显著正相关,与COD呈显著负相关.因此,局部表征上是外源污染物的输入和湖泊营养水平的提高导致了沼泽化,但整体上是流域水资源的不合理利用进一步加剧了沼泽化的进程.
In order to comprehend the terrestrialization situation and its driving factors in Lake Nansi,the whole Lake Nansi and 21 inlets of the rivers entering the lake were sampled and investigated in August 2008,June 2009,August 2009,June 2010 and August 2010.The results showed that only 4 sites located in the Natural Reserve of Weishan Island and the inlet of Jiehe River with dense shipping belonged to no terrestrialization,2 sites lying the inlet of Laowanfu River with busy transport and the open water region of Nanyang Lake to slight terrestrialization,other 6 sites were moderate terrestrialization,12 sites severe terrestrialization and 1 site heavy severe terrestrialization among the 25 sampling sites.The degree of terrestrialization was significantly positively correlated to vegetation types,depth and organic matter content of silt,negatively correlated to pH and dissolved oxygen;the abundance of vegetation was close negatively correlated to depth of water,pH and dissolved oxygen;the silting level was positively to total nitrogen,total phosphorus,organic matter of sediment,negatively to chemical oxygen demand.So apparently the import of exogenous contamination and increase of trophic level promoted the terrestrialization speed,and the unreasonable development in the whole drainage area further accelerated this progress.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2011年第4期555-560,共6页
Journal of Lake Sciences
基金
国家水体污染控制与治理科技重大专项项目(2009ZX07210-009)资助
关键词
南四湖
沼泽化现状
驱动因素
Lake Nansi
terrestrialization situation
driving factor
