| 光谱学与光谱分析 |
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| Fluorescence Spectroscopic Characteristics of Fulvic Acid from the Long-Term Located Fertilization in Black Soil |
| LI Yan-ping1, WEI Dan2, ZHOU Bao-ku2, ZHAO Yue1, ZHANG Xi-lin2, WEI Zi-min1*, LI Shu-ling1 |
1. College of Life Science, Northeast Agricultural University, Harbin 150030, China
2. Institute of Soil Fertilizer and Environment Research, Heilongjiang Academy of Agriculture Sciences, Harbin 150086, China |
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Abstract In order to investigate the effect of long-term located fertilization on soil fulvic acid (FA), in this study, four soil samples were taken from black soil with long-term located fertilization (about 30 year) in Harbin, Heilongjiang province. The fertilization treatments included control (CK), N, P and K fertilization (NPK), horse manure (OM), combination of organic manure and chemical fertilizations (MNPK). Soil FA was extracted from the samples and purified. The excitation, emission, synchronous, and three-dimensional-excitation emission matrix fluorescence spectroscopy (3DEEM) characteristics of the FA were determined. The excitation, emission and synchronous scan spectra all indicated that the main peaks of FA in the NPK treatment exhibited a significantly blue shift compared with CK, while those of MNPK, OM treatment caused a red shift to some extent. 3DEEM spectra of FA in all treatments exhibited four peaks (peak a, peak b, peak c, and peak d), compared with FA in CK, the wavelengths shift tendency of peak a, peak b, and peak c of FA 3DEEM in NPK, MNPK and OM treatments were similar to that of traditional spectra in FA. In order to provide quantitative information of FA humification degree in different treatments, we investigated the fluorescence index f450/500 (FI), area integration (A370～600 nm, A1 370～412 nm, A4 538～600 nm). Compared with CK, the f450/500, ratio of A1/A in NPK and A4/A in MNPK treatment increased by 4.62%, 6.12%, 7.22%, respectively. However, the f450/500, the ratio of A1/A in MNPK and A4/A in NPK treatment decreased by 3.86%, 15.31%, and 7.22% respectively. This indicated that NPK application gave a lower degree of FA humification, and combination of organic manure and chemical fertilizations would lead to a greater degree of FA aromatization in black soil with long-term located fertilization than CK.
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Received: 2010-10-18
Accepted: 2011-02-20
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Corresponding Authors:
WEI Zi-min
E-mail: weizm691120@163.com
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