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濒临黄海的连云港徐圩新区河湖水网，是维系国家东中西区域合作示范区的先导区经济高质量发展和水生态文明建设的关键要素，探究其水环境空间特征和识别关键因子对于区域经济高质量发展具有显著的现实意义。2021年初秋对主城区重要的10条河流和4个湖泊进行实地取样和室内化验分析及多方法评估，发现研究区河湖水网表层水体pH值为7.95～8.72,呈弱碱性；盐度含量为0.4‰～8.9‰,平均值为4.0‰,总体为微咸水状态；河湖表层水质整体处于良好及以上水平，营养水平呈轻度富营养化，其中氨氮和总磷含量分别为0～2.10 mg/L和0.03～0.45 mg/L,整体都达到地表水Ⅲ类水平。主成分分析发现，影响区域河湖水环境的关键因子为盐度、电导率和总溶解性固体含量，透明度、总磷和总氮/总磷比值也对湖泊水环境有一定的影响。区域工业活动对水体硝态氮、TN和CODMn含量增加明显，而区域的种养殖活动则相对提升了磷含量。香河湖和云湖的修复措施，对湖泊营养水平的改善尚待提升，建议改善区域河湖网络的连通性和减少工农业源排放。研究成果可为滨海区域水环境可持续发展及健康河湖构建提供有力的科学依据。
Abstract：Xuwei New District of Lianyungang Municipality borders on Yellow Sea and is the key factor to hold the high-quality economic development together with the water ecological civilization construction in the pilot area of the National East West Regional Cooperation Demonstration Zone, and then it has a significant practical significance to explore the spatial characteristics of the water environment therein and identify the relevant key factors for the high-quality regional economic development. Through the relevant in-situ sampling and indoor testing-analysis as well as the evaluation with several methods made on the important 10 rivers and 4 lakes in the main urban area in early autumn 2021, it is found out that the pH value of the surface water body of the river-lake water network inside the study area is 7.95～8.72 with weak alkaline, while the salt content is 0.4‰～8.9‰ with the mean value of 4.0‰ and generally exhibits a state of brackish water. The overall surface water qualities of the rivers and lakes are in good levels and above, while the nutrient levels exhibit mild eutrphication, in which the contents of ammonia nitrogen and total phosphorus are 0～2.10 mg/L and 0.03～0.45 mg/L respectively and all reach the level of the Class Ⅲ of surface water. It is found out from the relevant principal component analysis that the factors affecting the water environments of the regional rivers and lakes are salinity, conductivity and total dissolved solids content, while transparency, total phosphorus and total nitrogen/total phosphorus ratio also have certain impacts on the lake water environments. The contents of nitrate nitrogen, TN and CODMn in the water body are significantly increased by the regional industrial activities, while the phosphorus content is relatively increased by the planting and breeding activities inside the region. For the restoration measures of Xianghe lake and Yunhu Lake, the improvements of the lake nutrition levels are necessary to be upgraded, for which it is suggested to improve the connectivity of the regional river-lake networks and reduce the emissions from industrial and agricultural sources. The study result can provide a strong scientific basis for the sustainable development of the water environment and the construction of healthy river and lake within the coastal area.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2022.06.012
中图分类号:X52
引用信息:
[1]崔键,李金凤,彭颖,等.滨海地区初秋河湖水网表层水环境特征及影响因素:以连云港徐圩新区为例[J],2022,53(06):132-145.DOI:10.13928/j.cnki.wrahe.2022.06.012.
基金信息:
江苏省自然资源厅自然资源发展专项资金(JSZRHYKJ202003);; 国家自然科学基金项目(41901155)