• 关键词：生物炭  湿地植物  生物炭衍生溶解性有机质（BDOM）  光谱特征  鄱阳湖

• 基金项目：国家自然科学基金（No.42067058，42067034）；江西省主要学科学术和技术带头人培养计划项目（No.20212BCJL23058，S2022RCDT2K0628）；自然资源部生态地球化学重点实验室开放基金项目（No.ZSDHJJ202004）

• 陈嘉铭
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022

• 聂明华
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022;自然资源部生态地球化学重点实验室，北京 100037

• 晏彩霞
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022

• 刘赟
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022

• 丁明军
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022

• 鞠民
• 江西师范大学地理与环境学院，鄱阳湖湿地与流域研究教育部重点实验室，南昌 330022

• 摘要：目前有关天然湿地植物生物炭衍生溶解性有机质（BDOM）光谱特征尚缺乏系统的分析，因此，本研究采用紫外可见吸收光谱、三维荧光光谱结合平行因子分析法（PARAFAC）、荧光区域积分法（FRI）对鄱阳湖3种湿地植物（苔草、南荻和芦苇）的物质组成和光谱特征进行了分析.结果表明，热解温度对湿地植物BDOM的生物地球化学特征有很大影响，随热解温度的升高其稳定性提高，在500 ℃及以上的热解温度下可 产生有效固碳生物炭.热解温度是影响BDOM释放的关键因子，BDOM释放量与温度呈显著负相关.BDOM释放含量总体上呈苔草>南荻>芦苇的规律.随着热解温度的升高，BDOM的分子量、类蛋白质浓度、有色溶解性有机质相对丰度、富里酸比例和芳香性逐渐下降，而腐殖化程度、自生源成分则先上升后下降.此外，通过PARAFAC解析出2个类腐殖质组分和2个类蛋白质组分，且苔草BDOM中荧光组分总体多于南荻和芦苇.FRI结果表明，300 ℃下BDOM以类富里酸为主，其他条件下BDOM以络氨酸类蛋白质、色氨酸类蛋白质为主.并且，本研究利用主成分 分析进一步探究了这些光谱参数间的相互关系，结果表明，苔草的溶解性有机碳含量、蛋白质浓度、芳香性、有色溶解性有机质相对丰度和 自生源有机质浓度均高于南荻和芦苇.

• Abstract：At present， there is still a lack of systematic analysis of the spectral characteristics of biochar-dissolved organic matter （BDOM） derived from natural wetland plants. Therefore， the ultraviolet-visible absorption spectrum， excitation-emission matrix fluorescence spectroscopy combined with parallel factor analysis （PARAFAC） and fluorescence region integral （FRI） were applied to investigate the spectral characteristics of BDOM derived from three types of wetland plants （Carex lasiocarpa-CC， Triarrhena Iutarioriparia-TI， and Phragmites australis-PA） in Poyang Lake. Results showed that the pyrolysis temperature significantly impacted the biogeochemical characteristics of BDOM derived from the wetland plants. The stability of biochar from the three types of wetland plants increased with the pyrolysis temperature， and the effective fixed-carbon in biochar was mainly produced at the pyrolysis temperature higher than 500 ℃. Pyrolysis temperature was a key factor affecting the release of BDOM from the wetland plants， and the amount of the released BDOM had a significant negative correlation with the pyrolysis temperature. The amount of the released BDOM was generally ordered as follows： CC>TI>PA. With the pyrolysis temperature increased， the molecular weight， the concentration of the protein-like substance， the chromophoric dissolved organic matter （CDOM） and the aromaticity of BDOM for all plants were decrease gradually； while the humification degree， autochthonous component and the ratio of the fulvic acid of BDOM firstly increased and then decreased. In addition， two humic-like components and two protein-like components were identified by PARAFAC. The concentration of the fluorescent components of BDOM from CC was higher than that from TI and PA. FRI results indicated that BDOM pyrolyzed at 300℃ was dominated by fulvic acid-like humus， while under other conditions， BDOM was dominated by tyrosine- and tryptophan-like protein. Finally， principal component analysis was processed to explore the relationship among all the spectral parameters. Results revealed that the concentration of the dissolved organic carbon， the protein-like substance， CDOM， and the autochthonous organic matter， and the aromaticity of BDOM for CC were higher than that for TI and PA.

• Key words：biochar  wetland plants  biochar-dissolved organic matter （BDOM）  spectral characterization  Poyang Lake

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