盐城滨海湿地土壤溶解性有机质的光谱特征分析

doi:10.19741/j.issn.1673-4831.2022.0424

摘要/Abstract

摘要： 采用紫外/可见光光谱和荧光光谱技术,研究盐城沿海的大米草(Spartina anglica)、碱蓬(Suaeda glauca)、芦苇(Phragmites australis)和刺槐(Robinia pseudoacacia)4种典型湿地类型土壤溶解性有机质(DOM)的光谱特征。结果表明,刺槐湿地土壤DOM的芳香性指数(SUVA₂₅₄)显著高于其他湿地;除碱蓬外,其他湿地表层土壤DOM的SUVA₂₅₄值显著高于深层土壤(P<0.05)。土壤DOM的荧光效率(FE)在土层间的差异明显,FE值随土壤深度增加而增加,且与SUVA₂₅₄值呈显著负相关关系(P<0.05);>25~40 cm土层芦苇湿地土壤DOM的FE值显著高于其他湿地类型(P<0.05)。不同湿地类型土壤DOM的荧光指数(FI)值均＜1.40,DOM陆源输入占主导作用。4种湿地类型中,大米草湿地土壤DOM的同步荧光腐殖化指数(HIX_syn)较高,刺槐湿地土壤DOM的HIX_syn在土层间表现出显著差异性。相关性分析表明,土壤有机碳和溶解性有机碳含量、C/N比与土壤DOM的SUVA₂₅₄值具有显著正相关关系。2种光谱技术综合分析结果显示,刺槐和大米草湿地表层土壤DOM的芳香性和腐殖化程度更高,表明其含有更多结构复杂的化合物。

关键词: 溶解性有机质, 化学结构, 光谱特征, 滨海湿地

Abstract: Ultraviolet/visible spectroscopy and fluorescence spectroscopy were used to describe the spectral characteristics of soil dissolved organic matter (DOM) in four typical coastal wetlands i.e. Spartina anglica, Suaeda glauca, Phragmites australis and Robinia pseudoacacia wetlands in Yancheng, China. The results show that the aromatic index (SUVA₂₅₄) of soil DOM under Robinia pseudoacacia community was significantly higher than that of other wetlands. Except for Suaeda Glauca wetland, the SUVA₂₅₄ values of DOM in the topsoil of all other wetlands were significantly higher than that in the soil of depth. The fluorescence efficiency (FE) of soil DOM was significantly different between soil layers and increased with soil depth, and also significant negative correlated with SUVA₂₅₄. In the >25-40 cm soil depth, the FE value of DOM in Phragmites Australis wetland was significantly higher than that in other wetlands. The FI values of soil DOM under the four vegetation communities were all less than 1.40, which indicates that the terrestrial input of DOM played a dominant role. The humification index (HIX_syn) value of soil DOM was higher in Spartina Anglica wetland, while the HIX_syn of Robinia pseudoacacia wetland showed significant differences between soil layers. Moreover, the SUVA₂₅₄ values of DOM were positively correlated with soil organic carbon, dissolved organic carbon and C/N ratio, respectively. Our findings indicate that the aromatization and humification of DOM were higher in the topsoil of Robinia pseudoacacia and Spartina Anglica wetlands, respectively, and suggest that there are more complex compounds in the topsoil in these wetlands.

Key words: dissolved organic matter, chemical structure, spectral characteristics, coastal wetlands

中图分类号:

X524

何冬梅, 王火, 祝亚云, 江浩. 盐城滨海湿地土壤溶解性有机质的光谱特征分析[J]. 生态与农村环境学报, 2023, 39(6): 781-787.

HE Dong-mei, WANG Huo, ZHU Ya-yun, JIANG Hao. Spectral Characteristics of Soil Dissolved Organic Matter in the Coastal Wetlands of Yancheng City, China[J]. Journal of Ecology and Rural Environment, 2023, 39(6): 781-787.

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