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文章摘要

基于稳定同位素示踪技术的竹仙洞小流域氮硫来源解析

Source Apportionment of Nitrogen and Sulfur in Zhuxiandong Catchment by Stable Isotope Tracer Technique

DOI：

英文关键词: Stable isotope Source apportionment of nitrogen and sulfur Tracer technique Zhuxiandong catchment

基金项目:国家重点研发计划基金资助项目（2023YFC3709002）；国家自然科学基金资助项目（41977171）；珠海市社会发展领域科技计划基金资助项目（2420004000307）；广东省省级生态环境专项资金资助项目（ZHZN2023-023，ZHZN2024-028）

作者	单位
赵新锋	广东省珠海生态环境监测站
王静宜	中山大学地理科学与规划学院,粤北岩溶区森林生态系统碳水耦合野外观测研究站
杨虹	广东省珠海生态环境监测站
赵立豪	广东省珠海生态环境监测站
黄慧星	广东省珠海生态环境监测站
容源懋	广东省珠海生态环境监测站
姚华夏	环境、自然保护及公园部,环境监测与报告处
陈建耀	中山大学地理科学与规划学院,粤北岩溶区森林生态系统碳水耦合野外观测研究站

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中文摘要:

以珠海竹仙洞流域为研究区，开展穿透雨〖CD*2〗树干流〖CD*2〗土壤水〖CD*2〗地表水连续水体环境监测，引入多相介质中多形态的氮、硫、氢和氧稳定同位素示踪手段，深入解析华南地区典型流域营养元素来源与循环机制。结果表明：大气降水中δD和δ18O分布具有显著的季节差异，丰水期氢氧同位素值较枯水期贫化，变动范围更大；穿透雨、树干流、土壤水和地表水的氢氧同位素受降水影响明显，其中地表水受蒸发作用影响最为显著；土壤水和地表水中硝酸根主要来源于土壤有机氮，占比约80%；铵态氮主要来源于固氮作用和天然有机质矿化作用，穿透雨和树干流中铵态氮可能来自植物分泌物溶解，土壤水中铵态氮来自有机质矿化；穿透雨和树干流中的硫酸根主要来自大气沉降，土壤水中硫酸根可能来自土壤中有机硫矿化和大气沉降。

英文摘要:

Taking the Zhuxiandong catchment in Zhuhai as the study area， this study conducted continuous water environment monitoring of throughfall， stemflow， soil water and surface water. Stable isotopes of nitrogen， sulfur， hydrogen and oxygen， specifically targeting their multiple chemical species across different phases, were used to trace nutrient sources and cycling mechanisms in a typical catchment in South China. The results showed significant seasonal variations in the δD and δ18O compositions of atmospheric precipitation. 〖GK!87mm〗Hydrogen and oxygen isotope values were more depleted and exhibited a greater range during the wet season compared to the dry season. The hydrogen and oxygen isotope compositions of throughfall， stemflow， soil water and surface water were strongly influenced by precipitation， with surface water displaying the most pronounced evaporation signal. Nitrate in soil water and surface water was primarily derived from〖HK〗 soil organic nitrogen， accounting for approximately 80%. Ammonium nitrogen was mainly derived from nitrogen fixation and natural organic matter mineralization. Ammonium nitrogen in throughfall and stemflow likely originated from dissolved plant exudates， while the ammonium nitrogen isotope values in soil water primarily came from organic matter mineralization. Sulfate in throughfall and stemflow was primarily derived from atmospheric deposition. Sulfate in soil water was likely derived from soil organic sulfur mineralization and atmospheric deposition.

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