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| Distribution and spectral characteristics of soil humus under diverse land use patterns in the wind erosion region |
| Received:June 24, 2024 |
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| KeyWord:wind erosion;soil humus;three-dimensional fluorescence spectrum;infrared spectrum |
| Author Name | Affiliation | E-mail | | BAI Xueyan | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | GU Siyu | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | gusiyu@neau.edu.cn | | WANG Ziying | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | CHE Yanjing | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | FENG Jingyi | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | ZHANG Weijian | Resources and Environment, Northeast Agricultural University, Harbin 150030, China | |
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| Abstract: |
| The objective of this study was to examine the distribution and spectral characteristics of soil humus under diverse land use patterns in the wind erosion region. To this end, the humus content, fluorescence spectral characteristics of fulvic acid（FA）and huminic acid（HA）, and infrared spectral differentiation of humin（HM） were investigated in the surface layer（0-15 cm） of the soil. The investigation was conducted in a heavily wind-eroded area of Qiqihar, Heilongjiang Province, China, utilising the soils of grassland, woodland and sloping cropland（down-slope, middle-slope and upper-slope segments delineated at 100 m intervals from the bottom to the top, respectively）. The results demonstrated that the total humus and carbon content of each component, the degree of humification（PQ） and the Hu-Fu ratio（cHA/cFA）of the soil under diverse land use patterns exhibited the following behaviour：grassland>woodland>farmland downslope section>farmland mid-slope section>farmland upslope section. Three-dimensional fluorescence spectra demonstrated that four distinct fluorescence peaks were predominantly observed in all soil FA and HA types, namely, the A peak of fulvic acid in the ultraviolet region, the C peak of fulvic acid in the visible region, the D peak of humic-like substances, and the B peak of proteinoids（tyrosine-like substances）. The A peak exhibited the greatest intensity. FA was affected by both internal and external sources, and HA was only affected by exogenous inputs, both of which were characterised by low autochthonous contribution and weak humification. Compared with sloping cropland, grassland and woodland exhibited more pronounced autochthonous sources and stronger soil humification. The infrared spectra demonstrated that the HM absorption peaks and bands exhibited similarities in grassland, woodland, and farmland soils. These similarities were characterised by the presence of the same types of functional groups, although the contents differed. It is noteworthy that grassland and woodland soils exhibited elevated concentrations of disubstituted benzene and cisolefins, which promoted the formation of stable HM structures. In conclusion, measures such as increasing vegetation cover and rationally planning land use were employed to maintain or enhance soil humus content, thereby mitigating the negative impact of wind erosion on soil organic matter. |
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