Study on Solid Surface Fluorescence Characteristic of Saline Soils around Lakes in Arid and Semiarid Regions
YU Hui-bin1,2, XI Bei-dou2*, WEI Zi-min3, MA Wen-chao2,4, HE Xiao-song1,2, GUO Xu-jing1,2, LIU Hong-liang1,2
1. School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China 2. Water Environment System Project Laboratory, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3. College of Life Science, Northeast Agricultural University, Harbin 150030, China 4. School of Engineering & Technology, China University of Geosciences, Beijing 100083, China
Abstract：Fluorescence spectroscopy relies on the fluorescence emitted by rigid conjugated systems and thus has been increasingly used to assess the soil organic matter (SOM) humification. This technique is widely applied to solution samples of humic substances, and so far no information exists about its applicability to solid-phase soil samples. Composite soil samples of different depths (0-20, 20-40 and 40-60 cm) were collected from four different halophyte communities along a saline-impact gradient, namely, Comm. Salicornia europaea (CSE), Comm. Suaeda glauca (CSG), Comm. Kalidium foliatum (CKF) and Comm. Sophora alopecuroides (CSA) located around Wuliangsuhai Lake. A humification index based on solid surface fluorescence spectroscopy (HIXSSF) was proposed, and compared with conventional humification indices I400/I360, I470/I360, I465/I399 and A4/A1. There were close positive linear correlations between HIXSSF and I400/I360, I465/I399 and A4/A1, but a poor positive linear correlation existed between the HIXSSF and I470/I360. The results indicated that HIXSSF can be taken as a tool to assess the soil humification. The HIXSSF of the CSE and CSG varied inappreciably within soil profiles and there was no trend with depth. However the HIXSSF varied appreciably in the CKF and CSA, and the HIXSSF of the bottom soil profile was higher than that of the other profiles. As a whole, the soil humification degree was low around Wuliangsuhai Lake, and the ecological environment was relatively fragile. The salinity showed a strong negative linear relationship with the I400/I360, I470/I360, I465/I399 and A4/A1, but a good negative linear relationship with the HIXSSF. The results indicated that the degree of the SOM humification increased with the drop in the salinity. The HIXSSF can be an indicator not only of the degree of SOM humification, but also of the process of the salinisation.
Key words：Solid surface fluorescence;Soil organic matter;Humification index;Salinity;Wuliangsuhai Lake
于会彬1,2，席北斗2*，魏自民3，马文超2,4，何小松1,2，郭旭晶1,2，刘鸿亮1,2 . 干旱半干旱地区湖泊周围盐碱土固体表面荧光光谱特征研究 [J]. 光谱学与光谱分析, 2010, 30(10): 2680-2684.
YU Hui-bin1,2, XI Bei-dou2*, WEI Zi-min3, MA Wen-chao2,4, HE Xiao-song1,2, GUO Xu-jing1,2, LIU Hong-liang1,2 . Study on Solid Surface Fluorescence Characteristic of Saline Soils around Lakes in Arid and Semiarid Regions . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(10): 2680-2684.
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