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| Effects of Straw Returning on Soil WSOC Fluorescence Characteristics with Different Tillage Methods |
| LI Yu-mei1, WANG Gen-lin2*, LI Cheng-yang1，3, LIU Zheng-yu4, MENG Xiang-hai5, WANG Wei1，SHAO Guang-zhong5, HU Ying-hui5 |
1. Heilongjiang Academy of Agricultural Sciences Institute of Soil Fertility and Environmental Resources, Harbin 150086, China
2. Heilongjiang Academy of Agricultural Sciences Institute of Animal Sciences, Harbin 150086, China
3. Northeast Agricultural University of Biological Science, Harbin 150021, China
4. Heilongjiang SuiBin Farm, Suibin 154213, China
5. Mudanjiang Branch of Heilongjiang Academy of Agricultural Sciences, Mudanjiang 157041, China |
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Abstract To study the effect of straw returning on composition of soil water-soluble carbon, the fluorescence spectral characteristics of WSOCwith depth were researched onland meadows with continuous no-tillage, shallow turning, deep turning and no-till cover, shallow and deep straw returning methods, and the results showed that the WSOC was all resolved two types of three fluorescent components in 0～50 cm soil layer with 3 kinds of tillage and corresponding straw returning, namely humus-like components C1 (240/400 nm) and C2 (245, 400/465 nm) and protein-like component C3 (220, 275/325 nm). Regardless of shallow or deep returning, the sequence was C1>C2>C3 in 0～20 cm topsoil, butthe change of C3 composition in 20～30 cm soil layer was negatively correlated with C1 and C2 components. It was also founded that the content of C3 component in 30～50 cm soil layer was increased with continuous straw returning. Fluorescence index analysis showed that the WSOC composition is a mixture of non-biological sources and biological sources, which indicated that the heterogeneous characteristics of the soil layer was obvious in 10～20 cm soil. For the reason of no disturbance to the soil in whole growing season with no-tillage and no-tillage straw cover, the self-generated characteristics in 20～50 cm soil layer was much strong. The ratio of C2/C1 in the 40～50 cm soil layer of straw deep returning was higher than that of shallow tillage and straw cover, indicating that thetenth of humus production and accumulation would be increased.
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Received: 2019-03-13
Accepted: 2019-07-28
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Corresponding Authors:
WANG Gen-lin
E-mail: wanggenlin2005@163.com
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