Spatial distribution and controlling factors of sediment nitrogen forms in the mangrove wetland at Dongzhai Port, Hainan Province
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摘要:
沉积物中氮的赋存形态直接影响其参与生物地球化学循环的进程、途径和贡献大小，探究沉积物中不同氮形态的环境地球化学行为对研究氮的地球化学循环具有重要意义。以海南东寨港红树林湿地沉积物为研究对象，分别采集表层沉积物和柱状沉积物，采用分级浸提法提取不同形态的可转化态氮进行空间分布特征及影响因素分析。结果表明：研究区沉积物中总氮(TN)质量分数在1 149.0~1 690.6 mg/kg之间，总可转化态氮(TTN)的质量分数在464.6~647.5 mg/kg之间，二者均呈现出从上游至入海口逐渐降低的空间分布特征；4种可转化态氮中强氧化剂浸取态氮(SOEF-N)与TTN呈显著正相关，也是最主要的氮形态存在形式。通过沉积物C/N比值分析可知，研究区有机质主要来自污染物的大量排入，东寨港红树林柱状沉积物中TN与含水率、TOC呈极显著的正相关关系，表明氮与有机质具有相似的来源。
Abstract:The occurence of nitrogen in sediments directly affects the process, pathway and contribution of nitrogen in the nature, therefore exploring the environmental geochemical behavior of different nitrogen speciation in sediments is of great significance for studying nitrogen geochemical cycle. In this study, the surface sediment and sediment core were collected in the mangrove wetland at Dongzhai Port, Hainan Province.The different forms of transferable nitrogen were analyzed via hierarchical extraction.The spatial distribution characteristics and influencing factors were investigated. The results showed that the contents of total nitrogen (TN) and total transferable nitrogen (TTN) in the sediments ranged from 1 149.2 to 1 690.6 mg/kg and from 464.6 to 647.5 mg/kg, respectively, both of which presented a decreasing trend from the upstream to the estuary. The strong oxidant extracted nitrogen (SOEF-N) is the major nitrogen species in TTN, and positively correlated with TTN contents. According to C/N ratio, the organic matter in the study area is mainly from the discharge of a large number of pollutants.The significant positive correlation between TN, water content and TOC in the mangrove columnar sediments in Dongzhai Port, indicates that nitrogen and organic matter have similar sources.
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Key words:
- mangrove /
- nitrogen form /
- sediment /
- spatial characteristics /
- Dongzhai Port in Hainan
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图 1 东寨港红树林湿地沉积物采样分布图
Figure 1. Sediments sampling in mangrove wetland at Dongzhai Port
图 3 研究区表层沉积物中各类氮形态的空间分布图
Figure 3. Spatial distribution of nitrogen species in surface sediments in the study area
图 4 研究区沉积物中各类氮形态垂向分布特征
Figure 4. Vertical distribution characteristics of nitrogen species in sediments in the study area
表 1 研究区表层沉积物各形态氮及理化性质的相关性
Table 1. Correlation coefficients of nitrogen species in surface sediments in the study area
pH TOC TN TTN IEF-N WAEF-N SAEF-N SOEF-N pH 1.000 TOC -0.225** 1.000 TN -0.438* 0.209 1.000 TTN -0.357** 0.346 0.931** 1.000 IEF-N -0.608 0.857 -0.519 0.159 1.000 WAEF-N 0.099 0.057 0.670 0.109 0.926** 1.000 SAEF-N -0.335 0.321 0.798** 0.673** 0.111 0.031 1.000 SOEF-N -0.529** 0.968** 0.892** 0.972** 0.173 0.143 0.512* 1.000 注：*表示显著相关性水平在0.05水平; **表示显著相关性在0.01水平 
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表 2 研究区柱状沉积物各形态氮及理化性质的相关性
Table 2. Correlation of nitrogen species and physicochemical properties of columnar sediments in the study area
pH 含水率 TOC TN TTN IEF-N WAEF-N SAEF-N SOEF-N pH 1.000 含水率 0.511** 1.000 TOC 0.579** 0.788** 1.000 TN 0.464** -0.538** 0.536** 1.000 TTN 0.498** -0.298** 0.867** 0.948** 1.000 IEF-N 0.612** 0.310** 0.393** 0.294* 0.334** 1.000 WAEF-N 0.587 -0.584** 0.479** 0.418** 0.596** 0.308** 1.000 SAEF-N -0.230** -0.420** 0.521** 0.734** 0.777** 0.355** 0.525** 1.000 SOEF-N -0.130** -0.316** 0.779** 0.874** 0.922** 0.158 0.451** 0.486** 1.000 注：*表示显著相关性水平在0.05水平；**表示显著相关性在0.01水平
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