摘要
选取两淮采煤沉陷区内3个不同营养水平的水域为研究站点,即淮北南湖站(HBNH)、淮南潘谢顾桥站(PXGQ)和潘谢谢桥站(PXXQ),首先分析了水体营养盐含量、比例结构和营养状态指数,3个站点TP浓度的年均值分别为0.056、0.064和0.092 mg/L,TN浓度年均值则为1.00、0.94和2.67 mg/L,3个站点水体呈现"中营养-轻度富营养"和"中度富营养"2种营养状态,总体上表现出P相对N缺乏的特征.设置对照组、加氮组、加磷组和加氮磷组开展秋季氮、磷限制模拟实验研究.结果表明:HBNH、PXXQ两个站点为P限制,而PXGQ站点则为N限制.尽管水体正磷酸盐浓度较低,但由于藻类具有利用有机磷或储备P库的能力,3个研究站点依然保持了较高的初级生产力,HBNH、PXGQ和PXXQ 3个站点的叶绿素a浓度年均值分别为13.07、26.95和46.25 mg/m3,与各水体的营养水平保持一致.两淮采煤沉陷区水体富营养化控制关键可能在于调控磷元素的水平.
Three waters of different trophic states in the Huaibei and Huainan coal mining subsidence areas,including sites HBNH,PXGQ and PXXQ,were chosen to address their nutrient content,ratio of nitrogen to phosphorus （N∶ P）,and nutrient limitation.Averaged annual concentrations of total phosphorus （TP） in the three sites are 0.056,0.064 and 0.092 mg/L,while the total nitrogen （TN） concentrations are 1.00,0.94 and 2.67 mg/L,respectively.The three studied waters present two trophic levels of “meso-trophic to light eutrophication＂ and “meso-eutrophciation＂ with deficiency of phosphorus.Nutrient enrichment bioassays were performed by four groups＇ experiments.Three treatments were cultured with additions of nitrogen （＋ N）,phosphorus （＋ P）,and nitrogen plus phosphorus （＋ N ＋ P）,with raw water without additions as control.HBNH and PXXQ show features of P limitation,and the other one,PXGQ presents N limitation due to its lower available inorganic nitrogen.Although very low phosphate concentrations,the three sites still have rather high primary production,with their chlorophyll-a concentrations of 13.07 （HBNH）,26.95 （PXGQ） and 46.25 mg/m3 （PXXQ）,which are in accordance with their nutrient states.The results of this research give implication of the importance of P control to these waters in the Huainan and Huaibei coal mining subsidence areas.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2013年第6期916-926,共11页
Journal of Lake Sciences
基金
国家自然科学基金项目(41202242)
安徽省教育厅自然科学研究重点项目(KJ2011A084)
安徽理工大学硕博基金项目
淮北矿业股份有限公司2012年科学技术研究项目联合资助
关键词
采煤沉陷区
氮
磷
营养限制实验
Coal mining subsidence areas
nitrogen
phosphorus
nutrient enrichment bioassays
