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| Effect of different ways of corn stover application to soil on composition and structural characteristics of organic carbon in black soil |
| Received:September 01, 2016 |
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| KeyWord:corn stover;different application ways;soil organic C composition;structural characteristics |
| Author Name | Affiliation | E-mail | | DONG Shan-shan | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | DOU Sen | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | dousen1959@126.com |
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| Abstract: |
| The practice of corn stover application to soil is an important measure to improve soil fertility and increases soil organic matter. However, the influence of different ways of corn stover application on humus composition and humic acid structural characteristics in soil is not well understood. The black soil of micro area corn field at the Jilin Agricultural University was taken as the research object, and three treatments were set as follows:CK(No corn stover incorporated), C1(corn stover incorporated to shallow layer), C2(corn stover deep incorporation). Fulvic acid(FA), humic acid(HA) and humin(HM) were extracted by the modified humus component method, and purified HA was prepared by IHSS method, and to measure its structural properties of element composition, infrared spectroscopy and differential thermal property. As the results show:Corn stover application to soil improved the organic carbon contents of soil humic components significantly, PQ values of soil humus(the radio of HA proportion in ex-tractable humus) increased significantly. compared with CK, the C1 treatment of SOC, HA, FA and HM in the surface soil(0~20 cm) significantly increased by 21.8%, 27.3%, 11.5% and 30% respectively, The C2 treatment of SOC, HA, FA and HM in the subsurface soil(20~40 cm) significantly increased by 26.3%, 32%, 13.4% and 31.9% respectively. It was found that C1 and C2 treatments could reduce the condensation degree, oxidation degree and thermal stability of HAs, increase the content of aromatic-C and aliphatic chain hydrocarbon, and make HA simpler in structure. These changes were representative in surface soil for the HA of C1 treatment, compared with CK, the (O+S)/C ratio decreased by 11.3%, the aliphatic-C/aromatic-C ratio(2920/1620) increased obviously by 23.4%. On the other hand, for the HA of C2 treatment, above changes mainly appeared in subsurface soil, the(O+S)/C ratio was 9.1% lower than CK, the aliphatic-C/aromatic-C ratio(2920/1620) significantly increased by 23% compared with CK. It has great significance to clarify the mechanism of improving soil fertility and to guide the practice of corn stover application to soil. |
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