喀斯特山区土壤溶解性有机质光谱特征及来源解析

黄凯文; 马珍; 苫君月; 张珍明; 王兴富; 黄先飞

doi:10.13205/j.hjgc.202305016

喀斯特山区土壤溶解性有机质光谱特征及来源解析

doi: 10.13205/j.hjgc.202305016

1. 贵州师范大学贵州省山地环境信息系统与生态环境保护重点实验室, 贵阳 550001;
2. 贵州省生物研究所, 贵阳 550008;
3. 贵州大学林学院/贵州省森林资源与环境研究中心, 贵阳 550025

基金项目:

贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2021]302)

详细信息

作者简介:
黄凯文(1996-),男,硕士,主要研究方向为土壤有机碳损失机制。hkw334420@163.com

通讯作者:
黄先飞(1983-),男,副研究员,主要研究方向为土壤环境科学。hxfswjs@gznu.edu.cn

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出版历程
- 收稿日期: 2022-05-18

SPECTRAL CHARACTERISTICS AND SOURCE ANALYSIS OF SOIL DISSOLVED ORGANIC MATTER IN KARST MOUNTAINOUS AREA

1. Guizhou Provincial Key Laboratory Information System of Mountainous Areas and Protection of Environment, Guizhou Normal University, Guiyang 550001, China;
2. Guizhou Institute of Biology, Guiyang 550008, China;
3. College of Forestry/Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang 550025, China

摘要

摘要: 采用紫外-可见光谱(UV-vis)与三维荧光光谱(EEMs),结合平行因子分析(PARAFAC)方法,对贵州省典型喀斯特山区土壤溶解性有机质(SDOM)的特征、来源及组成进行分析。结果表明:土壤溶解性有机碳(SDOC)含量因土地利用类型不同而存在差异,其中草地表层SDOC含量显著高于林地。利用PARAFAC模型解析出3种荧光组分,C1(类腐殖质)、C2(类色氨酸)和C3(类酪氨酸),3种组分含量间存在显著正相关(P<0.01),且在不同土地利用方式下的分布有所差异。紫外特征参数显示:草地表层SDOM 相对分子质量小于林地,旱地SDOM中芳香物质和疏水性组分较多。荧光特征参数显示:研究区SDOM总体腐殖化程度较低、稳定性较弱,且不同土地利用类型SDOM来源存在差异。林地以微生物源输入为主,旱地兼具微生物源与陆源共同作用,但以新生自生源为主。草地表层SDOM来源特征与旱地相同,亚表层则以微生物源输入为主。随着海拔升高,组分C1占比增加,C3占比降低,SDOM腐殖化程度增强,微生物源贡献减弱。SDOM荧光与吸光特征可有效表征喀斯特山地SDOM组分与来源特性,可作为区域土地利用与环境决策的评价指标。
- 土壤溶解性有机质 /
- 喀斯特 /
- 紫外-可见光谱 /
- 三维荧光光谱 /
- 平行因子分析
Abstract: The characteristic, source, and composition of soil dissolved organic matter (SDOM) in typical karst mountainous area of Guizhou Province were studied by using ultraviolet-visible absorption spectrum (UV-vis) and three-dimensional fluorescence excitation-emission matrix (EEMs) combined with parallel factor analysis (PARAFAC). The results showed that SDOC content varied with the land-use type, and the SDOC content of grassland surface layer was significantly higher than that of woodland. Three fluorescent components, C1 (humic-like), C2 (tryptophan-like), and C3 (tyrosine-like), were derived from SDOM using the PARAFAC model. There was a significant positive correlation among the three components (P<0.01), and these three components were distributed differently in different land-use types. UV-vis spectral characteristics indicated that the relative molecular weight of SDOM in the grassland surface layer was smaller than that in the woodland, and SDOM in arid land contained more aromatic substances and hydrophobic components. The fluorescence characteristic index indicated that SDOM in the study area had a low humification degree and weak stability, and there were differences in SDOM sources among different land-use types. SDOM in woodland was mainly derived from autochthonous sources. SDOM in arid land was derived from autochthonous and terrigenous sources. The SDOM source characteristic of grassland surface layer was the same as those of arid land, while SDOM in the subsurface layer was mainly derived from autochthonous sources. With the increase in altitude, the proportion of component C1 increased, the proportion of C3 decreased, the humification degree of SDOM increased, and the contribution of microbial sources decreased. The study indicated that SDOM fluorescence and absorption characteristics can effectively track the composition and source characteristics of the SDOM in karst mountains, and be used as an evaluation index for regional land use and environmental decision-making.
- soil dissolved organic matter /
- karst /
- ultraviolet-visible spectrum /
- three-dimensional fluorescence spectrum /
- parallel factor analysis

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