作　　者： ; ; ; ; ; ; ; ; (罗庚钊）;

机构地区： 中华人民共和国环境保护部

出　　处： 《中国环境科学》 2013年第S1期233-238,共6页

摘　　要： 龙江河是柳江的最大支流,在2012年丰水期和枯水期对龙江河进行水质风险调查,分析龙江河氮、磷营养盐时空分布特征以及水体营养状态,并对其水质风险进行评价.结果表明,龙江河氮元素污染较严重,丰水期的TN浓度高于枯水期,丰水期TN浓度为1.33~3.15mg/L,枯水期为1.25~2.26mg/L;丰水期和枯水期NO3-N/TN值分别为0.67和0.84,NO3-N为龙江河氮元素的主要存在形式;丰水期TP浓度低于枯水期,丰水期TP浓度为0.03~0.07mg/L,枯水期为0.04~0.12mg/L.龙江河N/P比例关系表明水体处于磷限制状态,综合营养状态指数TLI(∑)结果表明龙江河大部分河段处于中营养水平,龙江河枯水期具有发生藻类水华的潜在风险. Longjiang River is the biggest tributary of Liujiang River. In wet and dry season in 2012, the characteristic of temporal-spatial variation of nitrogen and phosphorus was studied, and eutrophication risk assessment was done as well. The results showed that nitrogen pollution in Longjiang River was severe and TN concentration was higher in wet season than that in dry season. The range of TN concentration was 1.33~3.15mg/L in wet season and 1.25~2.26mg/L in dry season. NO3-N/TN in wet and dry season was 0.67 and 0.84 respectively, which showed that NO3-N was the major form of nitrogen in Longjiang River. TP concentration was higher in dry season than in wet season. In dry season, TP concentration was 0.04~0.12mg/L and in wet season was 0.03~0.07mg/L. N/P ratio showed that phosphorus was the limited nutrient for the growth of phytoplankton in Longjiang River. According to trophic level index, TLI(∑), it was mesotrophic for most reach of Longjiang River. Potential risk of algal bloom exists in dry season in Longjiang River.

关 键 词： 龙江河 氮 磷 富营养化 水质风险

领　　域： [环境科学与工程]