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首页> 外文期刊>RSC Advances >Fluorescent characteristics of dissolved organic matter released from biochar and paddy soil incorporated with biochar
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Fluorescent characteristics of dissolved organic matter released from biochar and paddy soil incorporated with biochar

机译：从生物炭和水稻土释放的溶解有机物质掺入生物炭的荧光特性

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Dissolved organic matter (DOM) plays a critical part in many processes of the ecological environment due to its mobility and reactivity in the soil and water interface. In the presented study, excitation-emission matrices (EEM) coupled with parallel factor analyses (PARAFAC) and UV-visible spectroscopy were introduced to investigate the variation of DOM derived from wheat straw biochar produced at different pyrolysis temperatures (300 °C, 500 °C and 700 °C), qualitatively and quantitatively. The dissolved organic matter (DOM) content of 700 °C biochar achieved a maximum of 1.45 g kg ~(?1) , while a minimum of 0.61 g kg ~(?1) was found at 500 °C. Components consisting of protein and tryptophan-like, UVA humic acid-like and UVC humic acid-like substances were extracted from the fluorescence data using PARAFAC. The abundance of fluorescent components predicted that DOM was mainly composed of more aromatic humic materials and litter amino acids with the increase in the pyrolysis temperature. Additionally, a column experiment simulating a paddy field was conducted to evaluate the feasible application of biochar produced at different temperatures, and the results showed that biochar addition enhanced the aromaticity and accelerated the decomposition of DOM released from flooded paddy soil. However, the indices SUVA _(254) and SUVA _(260) showed increasing tendencies in the soil profile, which may be ascribed to the downward transport of water-soluble DOM during the period of leaching. Briefly, the findings obtained, reinforced by statistical analysis could provide some valuable and distinct optical information of DOM derived from biochar and offer technical guidance when incorporating biochar into paddy soil in agricultural production.
机译：溶解有机物（DOM）由于土壤和水界面中的流动性和反应性，在生态环境的许多过程中起关键部分。在所提出的研究中，引入了与平行因子分析（PARAFAC）和UV可见光谱偶联的激发 - 发射矩阵（EEM）研究了衍生自不同热解温度（300℃，500°C 500°C的小麦秸秆生物炭的变化C和700°C），定性和定量。 700℃的溶解有机物（DOM）含量为700℃，最大含量为1.45g kg〜（α1），而在500℃下发现至少0.61g kg〜（α1）。使用PARAFECAC从荧光数据中提取由蛋白质和色氨酸样，UVA腐殖酸样和UVC腐殖酸样物质组成的组分。荧光成分的丰度预测，DOM主要由更多芳香族腐殖质材料和垃圾氨基酸组成，随着热解温的增加。另外，进行了一项模拟稻田的柱实验，以评估生物炭在不同温度下产生的可行应用，结果表明，生物炭加入增强了芳香性，加速了淹没水稻土的DOM的分解。然而，索引SUVA _（254）和SUVA _（260）显示了土壤剖面上增加的趋势，这可能归因于在浸出期间水溶性DOM的向下运输。简而言之，通过统计分析加强的结果可以提供来自生物炭的DOM的一些有价值和不同的光学信息，并在农业生产中将生物炭加入水稻土时提供技术指导。

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