| 海南东寨港红树林湿地沉积物氮形态空间分布特征及影响因素 |
| |
| 引用本文： | 朱鹏光,甘义群,赖咏毅,尤悦,姜颖.海南东寨港红树林湿地沉积物氮形态空间分布特征及影响因素[J].地质科技通报,2023,42(1):369-377. |
| |
| 作者姓名： | 朱鹏光 甘义群 赖咏毅 尤悦 姜颖 |
| |
| 作者单位： | 1a.中国地质大学(武汉)地质调查研究院, 武汉 430074 |
| |
| 基金项目： | 中国地质调查局项目DD20190304 |
| |
| 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。
|
| 关 键 词： | 红树林 氮形态 沉积物 空间特征 海南东寨港 |
| 收稿时间： | 2021-05-24 |
Spatial distribution and controlling factors of sediment nitrogen forms in the mangrove wetland at Dongzhai Port,Hainan Province |
| |
| Affiliation: | 1a.Institute of Geological Survey, China University of Geosciences(Wuhan), Wuhan 430074, China1b.School of Environmental Studies, China University of Geosciences(Wuhan), Wuhan 430074, China2.Wuhan Botanical Garden, Chinese Academy of Science, Wuhan 430074, China |
| |
| 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. |
| |
| Keywords: | |
|
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
|
点击此处可从《地质科技通报》下载全文 |
|
