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| Effects of corn straw and its humified and carbonized materials applying to the black soil with an equal mass of carbon on soil humus |
| Received:January 22, 2018 |
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| KeyWord:corn straw;humified corn straw;biochar;humus composition;humic acid structure |
| Author Name | Affiliation | E-mail | | SHAO Man-jiao | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases in Jilin Province, Changchun 130118, China | | | DOU Sen | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases in Jilin Province, Changchun 130118, China | dousen1959@126.com | | XIE Zu-bin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| In this study, pot experimentation was conducted to investigate the differences in carbon sequestration on humus composition and humic acid (HA) structure under applications of three different forms of corn straw (original, humified, and carbonized) to black soil with an equal mass of carbon. The four treatments were non-organic material amendment as control (CK), corn straw (CS), humified corn straw (HCS), and biochar (Bc). Each treatment material was fully mixed with the soil in triplicate. The following results were found. The Bc, HCS, and CS treatments increased the SOC contents by 18.20%, 17.36%, and 1.45%, respectively; the water soluble substance (WSS) contents had significant increases of 36.36%, 36.36%, and 18.18%, respectively, and the humin (HM) contents increased by 28.91%, 24.69%, and 1.25%, respectively. In addition, the HA contents with the Bc, HCS, and CS treatments significantly increased by 21.64%, 19.65%, and 8.46%, respectively. In contrast, the FA contents significantly decreased for all treatments, compared with that of the CK. The values of PQ were 62.86%, 67.47%, 69.86%, and 74.16% for CK, CS, HCS, and Bc, respectively. Great difference was observed in the HA molecular structure with the addition of different materials. The ratio of H/C and 2920/1620 of CS and HCS treatment increased, and the exothermic heat ratio of high temperature/moderate temperature and weight loss significantly decreased. These results indicated that corn straw and humified corn straw applications to the soil facilitated the simplification of the soil humic structure by decreasing the HA condensation, aromaticity, hydrophobicity, while simultaneously increasing the HA molecular aliphaticity. In contrast, the ratio of H/C and 2920/1620 of Bc treatment decreased, and the exothermic heat ratio of high temperature/moderate temperature and weight loss significantly increased. These results indicated that biochar application to the soil was helpful in promoting HA molecular condensation and aromaticity and the soil HA molecular tends to be complicated and stable. These results suggested that the CS and HCS treatments had the highest HA activities, whereas Bc treatment was beneficial to increase soil organic carbon. |
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