嘉陵江重庆段营养盐空间变化特征及营养状态评价  

Spatial Variation of Nutrients and Trophic States Evaluation in Chongqing Segment of Jialing River

作　　者：张勇[1] 杨敏[1,2] 张晟[1,2] 刘朔孺[1] 张方辉[1] 

机构地区：[1]重庆市环境科学研究院 [2]重庆市有机污染物环境化学行为与生态毒理重点实验室,重庆401147

出　　处：《重庆师范大学学报（自然科学版）》2015年第5期68-74,共7页Journal of Chongqing Normal University:Natural Science

基　　金：国家水体污染控制与治理专项(No.2012ZX07104-003)

摘　　要：为研究嘉陵江水环境的演变过程以及为嘉陵江环境治理提供依据和技术支持,对嘉陵江重庆段7个断面总氮(TN)、总磷(TP)、叶绿素a(Chla)、高锰酸盐指数(CODMn)、透明度(SD)、硝态氮(NO-3-N)、亚硝态氮(NO-2-N)、氨氮(NH+4-N)、总溶解态磷酸盐(TDP)进行2年的连续监测,对营养盐的空间变化特征进行分析,结合相关性分析,利用单因子法和综合营养状态指数法评价水体营养盐结构和营养状态。研究结果显示,研究区水体TN,TP,Chla,CODMn含量和SD差异较大,TN和TP的值远高于发生富营养化的阈值。相关性分析表明Chla与SD,TN,CODMn相关性不显著,与TP呈极显著负相关;SD与TN,TP,CODMn呈极显著负相关,TN,TP呈极显著正相关。利用单因子评价方法表明嘉陵江重庆段水体水质以II类为主,但由于草街水库的修建导致水体流速温度等变化,故虽然嘉陵江重庆段水体总体营养状态评价低于轻度富营养化阈值,但已发生水华爆发,应引起高度重视。In order to understand the evolution process of water environment and provide technical support for environmental govern-ance in Jialing River, Total nitrogen （TN）, total phosphorus （TP）, chlorophyll a （Chla）, permanganate index （CODMn）, transpar-ency （SD）, nitrate （NO3-N）, nitrite （NO2-N）, ammonia （NH＋-N） and total dissolved phosphate （TDP） were determined inChongqing segment of Jialing River during 2 years conductive study. The nutrient structure and trophic status of water were also as-sessed by the means of correlation analysis, single-factor and c integrated nutrition state index evaluation method. The result showedthat the value of TN, TP, Chla, CODMn and SD were different in each section in Chongqing segment of Jialing River. The concen-trations of TN and TP were much higher than threshold of eutrophication occurrence. Correlation analysis found Chla have not sig-nificantly correlated with SD, TN, CODMn, while posed an extremely significant negative correlation with TP. Moreover, TN posedan extremely significant positive correlation with TP, and SD showed an extremely negative correlation with TN, TP and CODMn,respectively. The result of single-factor evaluation indicated water quality was Class II in Chongqing segment of Jialing River. How-ever, the flow and temperature of Jialing River were changed due to the construction of Caojie Reservoir, resulted in algal bloomoutbreaks even the trophic state evaluation of Jialing River is below the threshold of light eutrophic. Therefore, high attentionshould be paid on the water quality of Jialing River.

关 键 词：嘉陵江 营养盐 空间变化 营养状态 评价 

分 类 号：X824[环境科学与工程—环境工程]