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Special Issue:
农业生态环境-有机碳与农业废弃物还田合辑Agro-ecosystem & Environment—SOC
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| Variation in spectral characteristics of dissolved organic matter derived from rape straw of plants grown in Se-amended soil |
JIA Wei1, ZHAO Xiao-hu1, ZHAO Yuan-yuan1, XU Jia-yang1, MING Jia-jia1, CAI Miao-miao1, HU Cheng-xiao1, 2 |
1 College of Resources and Environment/Research Center of Trace Elements, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Wuhan 430070, P.R.China
2 Hubei Provincial Engineering Laboratory for New-type Fertilizer, Wuhan 430070, P.R.China |
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Abstract Straw return is an effective management practice. It not only utilizes agricultural waste but also introduces dissolved organic matter (DOM) into the soil. Selenium (Se) is an essential trace element in the human diet and contributes to the popularity of Se-enriched agricultural products in the Chinese market. Moreover, there are still some Se-enriched agricultural products that have yet to be utilized. This study investigated whether Se addition in soil caused component changes in the DOM extracted from rape straw. DOM extracted from rape straw grown in soil with four Se levels (0, 0.1, 0.5 and 1.0 mg Se kg–1 soil) was characterized by UV-Visible spectroscopy, fluorescence spectroscopy and FTIR spectroscopy. The UV-visible spectra revealed that 0.1 mg Se kg–1 soil reduced the molecular weight of DOM and caused the presence of more irreplaceable aromatic structures in the substituent groups of the DOM, while 0.5 and 1.0 mg Se kg–1 soil only reduced the DOM molecular weight. Fluorescence spectroscopy indicated that Se improved the humification degree but reduced the aromaticity of DOM. FTIR spectra proved that Se altered the contents of carboxylic acids, amino acids, alcohols and aromatic heterocycles in DOM, which were maximized in the 0.5 and 1.0 mg Se kg–1 treatment groups. We concluded that Se application could change the composition of DOM extracted from rape straw, potentially impacting the nutrient bioavailability in soil. This study provides basic data on Se-enriched rape straw utilization for eco-agriculture.
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Received: 09 May 2019
Accepted:
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Fund: This work was supported by the National Natural Science Foundation of China (41571321 and 31201501), the Fundamental Research Funds for the Central Universities of China (2662018JC057), and the Opening Project of Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture and Rural Affairs of China (NK201702).
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Corresponding Authors:
Correspondence HU Cheng-xiao, Tel: +86-27-87288840, E-mail: hucx@mail.hzau.edu.cn
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| About author: JIA Wei, Tel: +86-371-63555713, E-mail: jiawei7@webmail.hzau.edu.cn; |
Cite this article:
JIA Wei, ZHAO Xiao-hu, ZHAO Yuan-yuan, XU Jia-yang, MING Jia-jia, CAI Miao-miao, HU Cheng-xiao.
2020.
Variation in spectral characteristics of dissolved organic matter derived from rape straw of plants grown in Se-amended soil. Journal of Integrative Agriculture, 19(7): 1876-1884.
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