喀斯特地区端元样品中溶解有机质的多维特征与源辨析研究
Multidimensional features and sources apportionment of dissolved organic matter from End-member Samples in the Karst Area
查看参考文献50篇
|
文摘
|
由于喀斯特地区水生生态系统中碳循环的复杂性,给溶解有机质(Dissolved organic matter,DOM)的来源解析带来了巨大的挑战和困难.本研究应用C/N比值、δ~(13)C组成、紫外-可见吸收光谱与三维荧光光谱等表征技术,综合对比了西南喀斯特地区典型土壤与水生植物样品DOM的多维特征,探讨了示踪喀斯特地区DOM来源的可靠方法与指标.结果表明:水生植物的C/N比值波动范围较大,石灰土的C/N比值偏低,水生植物与土壤样品的C/N比值及δ~(13)C组成有所重叠,难以区分DOM的来源.多种紫外吸收系数(a_(254)、a_(280)、a_(300)与a_(350))侧面反映了不同DOM样品中芳香族化合物的相对丰度,SUVA_(254)、E2/E3、E4/E6与腐殖化指数(HIX、HIX_(ohno))指示了样品之间腐殖化程度的差异,特别是HIX、荧光指数(FI)、S_R较好区分了浮游藻类与土壤DOM.修正荧光指数(YFI)还揭示了不同DOM样品的化学组成,与三维荧光光谱的平行因子分析相吻合.此外,黄壤因较低的pH值会使土壤有机质酸解为含氮组分,导致HIX、FI和S_R的匹配性不好.除浮游藻类外,HIX表明水生植物DOM均为内源,S_R却显示其主要为外源,而FI指示兼有内源和外源.因此,在进行喀斯特地区DOM来源解析时,光谱技术相比C/N比值和δ~(13)C分析更加简便、有效,同时应注意不同土壤类型的异质性与水生生态系统的复杂性. |
|
其他语种文摘
|
Due to the complexity of the carbon cycle in aquatic ecosystems in karst areas,it has brought huge challenges and difficulties to the source apportionment of dissolved organic matter(DOM).In this study,the C/N ratio,δ~(13)C composition,ultraviolet-visible absorption and three-dimensional fluorescence spectroscopy techniques were comprehensively used to compare the multidimensional features of DOM from typical soils and aquatic plants in the Southwest China Karst Region,in order to explore reliable methods and effective indicators for tracing the source of DOM in karst areas.The results showed that the C/N ratio of limestone soil was low,and the C/N ratio of aquatic plants and soil samples overlapped as well as the δ~(13)C values;thus,it is difficult to distinguish the sources of DOM.A variety of UV absorption coefficients(a_(254)、a_(280)、a_(300)、a_(350))together with SUVA_(254),E2/E3,E4/E6 better reflected the relative abundance of aromatic compounds in different DOM samples.The humification index(HIX and HIX_(ohno))indicated different humification degree among various DOM samples.Particularly,HIX,the fluorescence index(FI),and S_R,effectively distinguished DOM from algae and soil end-members.The modified fluorescence index YFI further revealed the main chemical composition of different DOM samples,in accordance with with the parallel factor analysis of the three-dimensional fluorescence spectrum.However,the low pH value of yellow soil will promote the acid decomposition of soil organic matter into nitrogen-containing components,resulting in poor matching of HIX,FI,and S_R.Except for algae,the HIX indices indicated that the DOM of aquatic plants was endogenous,S_R indicated exogenous DOM,and the FI reflected both endogenous and exogenous DOM.Therefore,when determining the sources of organic matter in karst areas,the spectroscopy technique is more effective and reliable than the C/N ratio and δ~(13)C analysis.Meanwhile,more attention should be given to the heterogeneity of different soil types and the complexity of aquatic ecosystems. |
|
来源
|
环境科学学报
,2022,42(8):425-437 【核心库】
|
|
DOI
|
10.13671/j.hjkxxb.2021.0579
|
|
关键词
|
碳循环
;
溶解有机质
;
特征
;
来源
;
紫外-可见吸收光谱
;
三维荧光光谱
|
|
地址
|
1.
中国科学院地球化学研究所, 贵阳, 550081
2.
中国科学院大学, 北京, 100049
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0253-2468 |
|
学科
|
环境科学基础理论;环境污染及其防治 |
|
基金
|
中国科学院战略性先导科技专项
;
国家自然科学基金项目
|
|
文献收藏号
|
CSCD:7265860
|
参考文献 共
50
共3页
|
|
1.
Bai L L. Roles of phytoplankton-and macrophyte-derived dissolved organic matter in sulfamethazine adsorption on goethite.
Environmental Pollution,2017,230:87-95
|
CSCD被引
9
次
|
|
|
|
|
2.
Bao Q. Primary productivity and seasonal dynamics of planktonic algae species composition in karst surface waters under different land uses.
Journal of Hydrology,2020,591:125295
|
CSCD被引
7
次
|
|
|
|
|
3.
Birdwell J E. Characterization of dissolved organic matter in cave and spring waters using UV-Vis absorbance and fluorescence spectroscopy.
Organic Geochemistry,2010,41(3):270-280
|
CSCD被引
70
次
|
|
|
|
|
4.
Bouillon S. Organic matter exchange and cycling in mangrove ecosystems:Recent insights from stable isotope studies.
Journal of Sea Research,2008,59(1/2):44-58
|
CSCD被引
17
次
|
|
|
|
|
5.
Chen B. Coupled control of land uses and aquatic biological processes on the diurnal hydrochemical variations in the five ponds at the Shawan Karst Test Site,China:Implications for the carbonate weathering-related carbon sink.
Chemical Geology,2017,456:58-71
|
CSCD被引
13
次
|
|
|
|
|
6.
陈崇瑛. 喀斯特地表水生生态系统生物碳泵的碳汇和水环境改善效应.
科学通报,2017,62(30):3440-3450
|
CSCD被引
11
次
|
|
|
|
|
7.
Derrien M. Characterization of aquatic organic matter:Assessment,perspectives and research priorities.
Water Research,2019,163:114908
|
CSCD被引
7
次
|
|
|
|
|
8.
Derrien M. Spectroscopic and molecular characterization of humic substances(HS)from soils and sediments in a watershed:comparative study of HS chemical fractions and the origins.
Environmental Science and Pollution Research,2017,24(20):16933-16945
|
CSCD被引
1
次
|
|
|
|
|
9.
Di X. Implication of different humic acid fractions in soils under karst rocky desertification.
Catena,2019,174:308-315
|
CSCD被引
2
次
|
|
|
|
|
10.
邸欣月. 贵州喀斯特区域土壤有机质的分布与演化特征.
地球与环境,2013,43(6):697-708
|
CSCD被引
1
次
|
|
|
|
|
11.
Heo J. A new fluorescence index with a fluorescence excitation-emission matrix for dissolved organic matter(DOM) characterization.
Desalination and Water Treatment,2016,57(43):20270-20282
|
CSCD被引
2
次
|
|
|
|
|
12.
何伟. 溶解性有机质特性分析与来源解析的研究进展.
环境科学学报,2016,36(2):359-372
|
CSCD被引
91
次
|
|
|
|
|
13.
He Z. Characterization of plant-derived water extractable organic matter by multiple spectroscopic techniques.
Biology and Fertility of Soils,2009,45(6):609-616
|
CSCD被引
5
次
|
|
|
|
|
14.
Huguet A. Fluorescence spectroscopy applied to the optimisation of a desalting step by electrodialysis for the characterisation of marine organic matter.
Journal of Membrane Science,2009,326(1):186-196
|
CSCD被引
2
次
|
|
|
|
|
15.
江韬. 三峡库区消落带土壤溶解性有机质溯源:基于氮/碳比值的线性双端元源负荷分析.
环境科学,2019,40(6):2647-2656
|
CSCD被引
4
次
|
|
|
|
|
16.
Kutser T. Estimating lake carbon fractions from remote sensing data.
Remote Sensing of Environment,2015,157:138-146
|
CSCD被引
3
次
|
|
|
|
|
17.
劳心宇. 思林水库荧光溶解性有机质的特征、来源及其转化动力学.
环境科学,2019,40(3):1209-1216
|
CSCD被引
4
次
|
|
|
|
|
18.
Lee M H. New insight into the applicability of spectroscopic indices for dissolved organic matter(DOM)source discrimination in aquatic systems affected by biogeochemical processes.
Water Research,2018,147:164-176
|
CSCD被引
13
次
|
|
|
|
|
19.
刘新. 不同水生植物腐解过程中有色可溶有机物(CDOM)的产生过程及微生物群落变化分析.
长江流域资源与环境,2020,29(5):140-1149
|
CSCD被引
1
次
|
|
|
|
|
20.
李帅东. 环滇池土壤溶解性有机质(DOM)的光谱特征及来源分析.
光谱学与光谱分析,2017,37(5):1448-1454
|
CSCD被引
36
次
|
|
|
|
|
了解气象卫星更多信息，请访问