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| The Study of Hydrothermal Conditions’s Impact on the Structure of Black Soil Fulvic Acid Based on the Fluorescence Spectral Characteristics |
| GU Si-yu, LI Yue, CAI Yue-tong, GUO Xing-jun, ZHU Yu-wei, YU Xue-wei, YANG Yan, ZHANG Hui-hui* |
| College of Resources and Environment，Northeast Agricultural University，Harbin 150030，China |
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Abstract In order to understand the influence of hydrothermal conditions to the humification degree of fulvic acid in field black-soil, four samples Beian, Hailun, Binxian and Shuangcheng which were taken from four typical black soil regions in Heilongjiang, China, were selected for this study. In this study, the fulvic acid substances in these samples were extracted, and characterized their fluorescence properties. The results showed that, from north to south , as the increase of hydrothermal distribution, the concentration of fulvic acid substances, in Beian，Hailun，Binxian and Shuangcheng, presented a decrease trend. And the amount of the decrease were 9.90，8.71，5.48 and 4.70 g·kg-1, respectively. Humic acid and fulvic acid ratio is on the decline were 1.46，1.42，0.80 and 0.74 in turn, Higher proportion of fulvic acid leading to Humus structure tends to be more simple. The results of excitation-emission matrix regional integration analysis further confirmed that the intensity of fluorescence peak A and peak C in Beian presented the highest values and intensity of fluorescence peakA and peak C in Shuangcheng presented the lowest values in these four study regions. Compared with Beian, Hailun and Binxian study regional intensity of fluorescence Peak C was lower, and Regional integration (FRI) method showed that, from north to south, as the increase of hydrothermal distribution，visible light area like fulvic acid material significantly reduced; Parallel factor analysis (PARAFAC) results showed that the fulvic acid substances in these four study regions could be divided into two components. Component C1 was characterized as simple structure and low molecular weights substances, and Component C2 was regarded as complex structure and high molecular weights substances. With the increase of hydrothermal distribution , Component C1 was on the rise and Component C2 presented a decrease trend. The increase of Component C1 mainly came from the degradation of the intermediate of Component C2, and a higher proportion of Component C1 promoted the decomposition of FA in the soil. Two-dimensional synchronous scanning map showed that the lower latitude, the simpler structure of humic presented. FA in the black-soil, larger molecular weight and structure of complex material priority cracked form a simple structure relatively, high condensation degree of small molecular compound, and then decomposed completely. Based on the results above, a conclusion could be concluded, that hydrothermal conditions have disadvantage for accumulation of FA substances in black-soil.
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Received: 2017-02-22
Accepted: 2017-08-28
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Corresponding Authors:
ZHANG Hui-hui
E-mail: xtwfwf@126.com
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