| LIU Baoli,CAO Wenzhi,HUANG Zheng,CHEN Wenhui,CHEN Huihuang,LIU Lusan. 2018. Developing nutrient criteria for the Jiulong River Estuary, Southeast China. Acta Oceanologica Sinica, 37(2):1－13 |
| Developing nutrient criteria for the Jiulong River Estuary, Southeast China |
| 中国九龙江河口营养盐基准值研究 |
| Received:January 02, 2017 Revised:December 16, 2011 |
| DOI：10.1007/s13131-017-1121-0 |
| Key words:estuarine segmentation nutrient criteria ecosystems based approach |
| 中文关键词: 河口分区 营养盐标准 基于生态系统分析方法 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41076007 and 40676014; the National Basic Research Program of China under contract No. 2009CB421201; the Program of Introducing Talents of Discipline to Universities of China under contract No. B07036. |
| Author Name | Affiliation | E-mail | | LIU Baoli | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
College of the Environment and Ecology, Xiamen University, Xiamen 361102, China | | | CAO Wenzhi | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
College of the Environment and Ecology, Xiamen University, Xiamen 361102, China | wzcao@xmu.edu.cn | | HUANG Zheng | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
College of the Environment and Ecology, Xiamen University, Xiamen 361102, China | | | CHEN Wenhui | College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China | | | CHEN Huihuang | College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China | | | LIU Lusan | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| One of the key concerns in estuarine and coastal environments is eutrophication, which is known to be closely connected to nutrient enrichment. To control and improve surface water quality, nutrient criteria are recommended in order to provide reference conditions for the environment. However, the current datasets of nutrient criteria in China are either designed for surface water or sea water, and as such these are not suitable for assessing estuarine water quality, especially given the unique ecosystem and dynamic properties of estuaries. To address this issue in current estuarine water management, nutrient criteria have been developed for a local estuary in the southeast of China. Segmentation of the Jiulong River Estuary, China was firstly analysed through field investigations carried out during 2013-2014, which resulted in the delineation of three segments characterized by their distinct properties in relation to salinity, hydrology, ecosystems, etc. Historical records from 1997 to 2014 were then analysed using statistical modelling to develop candidate nutrient criteria for the estuary. This stage of the analysis was undertaken in combination with the study of nutrient status records from the 1980s, which were used to establish a baseline reference condition. The recommended criteria values of dissolved inorganic nitrogen (DIN) in Segments I, II and III of the Jiulong River Estuary are 64, 21 and 14 μmol/L, respectively, and the corresponding values for soluble reactive phosphorus (SRP) are 0.89, 0.76 and 0.89 μmol/L, respectively. It should be emphasised that these values are site-dependent, and that different results may be achieved at other locations depending on the physical and biogeochemical characteristics of an estuary, or even a single site within a catchment. It is hoped that by demonstrating a possible methodological approach and methods of nutrient criteria derivation in the Jiulong River Estuary, the current study will offer researchers some fundamental basis from which to begin to develop more complete nutrient criteria indices for the study of nutrient conditions in other estuaries throughout China. |
| 中文摘要: |
| 河口与海岸带面临的富营养化问题与水体中过量营养盐含量是紧密相关的，寻找水体营养盐基准值可以为控制和提高地表水水质提供参考。但是目前国内已有营养盐基准值仅针对地表淡水和海水，对于具有独特水动力和生态系统的河口半咸水来说是不适用的。特别是考虑到河口咸淡水的混合作用、生态系统的响应以及营养盐内部循环对水体浓度的影响，制定一个合理的河口营养盐基准值、有效控制河口营养盐浓度迫在眉睫。为此，本研究选取中国福建九龙江河口为研究区，探索制定河口营养盐基准值方法。九龙江河口区自2000年后水质恶化速度较快，大部分区域的营养盐浓度超过国家海水水质标准第四类海水的上限。本研究首先于2013-2014年分季节对九龙江河口地区进行多航次现场采样；根据采集的河口地貌、水域盐度及生态系统特征信息，采用GIS技术将九龙江河口分为具有显著物理、生化属性区别的三个区域；再根据频数累积法和基于赤潮数据的混合模型法分析该河口区营养盐历史数据（1994-2014年）和赤潮数据，以赤潮作为生态环境崩溃的标志，推导三个分区的营养盐推荐基准值。最终确定从河口向海三个分区的DIN基准值分别为64、21、14μmol/L（0.90、0.29、0.20mg/L），SRP的基准值分别为0.89、0.76、0.89μmol/L（0.028、0.024、0.028mg/L）。需要提醒的是，不同河口区营养盐基准值因不同环境特征而异。因此，本研究希望通过示范的营养盐基准值计算方法，促进我国河口海岸水环境标准的全面研究。 |
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