Changes of dissolved organic matter following salinity invasion in different seasons in a nitrogen rich tidal reach

溶解有机碳 化学 盐度 环境化学 有机质 腐殖质 氮气 荧光 色氨酸 有色溶解有机物 天然有机质 分析化学(期刊) 生态学 环境科学 氨基酸 土壤科学 生物 浮游植物 生物化学 营养物 物理 土壤水分 有机化学 量子力学
作者
Rongrong Xie,Jiabin Qi,Chengchun Shi,Peng Zhang,Rulin Wu,Jiabing Li,Joanna J Waniek
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:880: 163251-163251 被引量:7
标识
DOI:10.1016/j.scitotenv.2023.163251
摘要

Dissolved organic matter (DOM) is a heterogeneous mixture of dissolved material found ubiquitously in aquatic systems and dissolved organic nitrogen is one of its most important components. We hypothesised nitrogen species and salinity intrusions affect the DOM changes. Here, using the nitrogen rich Minjiang River as an easily accessible natural laboratory 3 field surveys with 9 sampling sites (S1-S9) were conducted in November 2018, April and August 2019. The excitation emission matrices (EEMs) of DOM were explored with parallel factor (PARAFAC) and cosine-histogram similarity analysis. Four indices including fluorescence index (FI), biological index (BIX), humification index (HIX) and the fluorescent DOM (FDOM) were calculated and the impact of physicochemical properties was assessed. The results suggested that the highest salinities of 6.15, 2.98 and 10.10, during each campaign corresponded to DTN concentrations of 119.29-240.71, 149.12-262.42 and 88.27-155.29 μmol·L-1, respectively. PARAFAC analysis revealed the presence of tyrosine-like proteins (C1), tryptophan-like proteins or a combination of the peak N and tryptophan-like fluorophore (C2) and the humic-like material (C3). The EEMs in the upstream reach (i.e. S1-S3) were complex with larger spectra ranges, higher intensities and similar similarity. Subsequently, the fluorescence intensity of three components decreased significantly with low similarity of EEMs (i.e. S4-S7). At the downstream, the fluorescence levels dispersed significantly and no obvious peaks were seen except in August. In addition, FI and HIX increased, while BIX and FDOM decreased from upstream to downstream. The salinity positively correlated with FI and HIX, and negatively related to BIX and FDOM. Besides, the elevated DTN had a significant effect on the DOM fluorescence indices. Altogether, salinity intrusion and elevated nitrogen are relevant for the distribution of the DOM, which is helpful for the water management tracing the DOM source according to the on-line monitoring of salinity and nitrogen in estuaries.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
荒野风发布了新的文献求助10
刚刚
轻松的鸿煊完成签到 ,获得积分10
1秒前
NCU-Xzzzz发布了新的文献求助10
1秒前
3秒前
JJG完成签到,获得积分20
4秒前
Hello应助Tiam采纳,获得10
5秒前
5秒前
ty完成签到,获得积分10
7秒前
zehua309完成签到,获得积分10
8秒前
火星上含芙完成签到 ,获得积分10
9秒前
量子星尘发布了新的文献求助10
11秒前
11秒前
掌门发布了新的文献求助10
11秒前
愉快的花卷完成签到,获得积分10
11秒前
少言完成签到,获得积分10
13秒前
kiko完成签到,获得积分10
14秒前
隐形惜筠完成签到 ,获得积分10
16秒前
黑眼圈完成签到,获得积分10
20秒前
123发布了新的文献求助10
22秒前
23秒前
24秒前
又又妈妈完成签到,获得积分10
24秒前
欢呼的丁真完成签到,获得积分10
25秒前
ty发布了新的文献求助10
25秒前
Faded完成签到 ,获得积分10
26秒前
ding应助Amorfati采纳,获得10
26秒前
好好学习天天向上完成签到,获得积分10
27秒前
所所应助lh采纳,获得10
28秒前
李爱国应助深情丸子采纳,获得10
28秒前
烟花应助阿湫采纳,获得10
28秒前
28秒前
乌梅不乌发布了新的文献求助10
29秒前
29秒前
YY完成签到,获得积分10
30秒前
31秒前
31秒前
Tiam发布了新的文献求助10
31秒前
种花家的狗狗完成签到,获得积分10
31秒前
wisdom完成签到,获得积分10
31秒前
123完成签到,获得积分10
32秒前
高分求助中
【提示信息,请勿应助】关于scihub 10000
Les Mantodea de Guyane: Insecta, Polyneoptera [The Mantids of French Guiana] 3000
徐淮辽南地区新元古代叠层石及生物地层 3000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Global Eyelash Assessment scale (GEA) 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 550
Research on Disturbance Rejection Control Algorithm for Aerial Operation Robots 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4038524
求助须知:如何正确求助?哪些是违规求助? 3576221
关于积分的说明 11374737
捐赠科研通 3305912
什么是DOI,文献DOI怎么找? 1819354
邀请新用户注册赠送积分活动 892688
科研通“疑难数据库(出版商)”最低求助积分说明 815048