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【他山之石】华中农业大学史志华教授团队:降雨期间坡面土壤成为流域可溶性有机质的关键贡献者

  • 2026-06-19 07:05:27
【他山之石】华中农业大学史志华教授团队:降雨期间坡面土壤成为流域可溶性有机质的关键贡献者

史志华教授团队Environmental Science & Technology:降雨期间坡面土壤成为流域可溶性有机质的关键贡献者

史志华教授团队Environmental Advances2026年5月12日 09:01辽宁听全文

第一作者:扈晓碟 博士生(华中农业大学)

通讯作者:肖海兵 副教授(华中农业大学)、史志华 教授(华中农业大学)

论文DOI: 10.1021/acs.est.6c02514

图文摘要
成果简介
近日,史志华教授团队在Environmental Science & Technology发表了题为“Molecular Evidence from FT-ICR MS and Bayesian Mixing Model Reveals Hillslope Soils as Dominant DOM Contributors during Rainfall”的学术论文(DOI: 10.1021/acs.est.6c02514)。该研究借助傅里叶变换离子回旋共振质谱(FT-ICR MS)与贝叶斯混合模型,阐明了端元(雨水、地下水、河岸土壤和坡面土壤)与径流可溶性有机质的光学与分子特征,揭示了降雨过程流域可溶性有机质来源的时空变化规律
全文速览
可溶性有机质是影响水质的关键因子,能与重金属及有机污染物结合,其来源直接决定水生态环境效应。团队通过高频原位监测与采样,系统分析了雨水、地下水、河岸土壤和坡面土壤四类潜在来源。研究发现,土壤有机质以类腐殖质为主,而雨水富含类蛋白质。降雨过程中,坡面土壤对径流有机质的平均贡献高达49.2%,远超河岸土壤(30.3%)、地下水(13.1%)和雨水(7.5%)。这一发现挑战了“河岸带主导河流有机质来源”的传统观点,凸显了坡地水土保持对水质保护的重要性
引言
可溶性有机质是水生生态系统中最活跃的化学组分之一,可通过多种机制与有机污染物及重金属结合,改变污染物在水体中的吸附、解吸与迁移行为,进而影响水环境质量与人类健康。已有研究表明,水生生态系统中可溶性有机质的组分特征与反应活性在很大程度上取决于其来源变化。然而,传统研究方法难以在时空维度上精细化解析可溶性有机质的来源动态,制约了对可溶性有机质输移机制的深入理解。本研究利用FT-ICR MS分子指纹和贝叶斯混合模型示踪DOM的时空源动态
图文导读

端元可溶性有机质特征

Fig. 1. DOC concentration, fluorescent components (a) and fluorescent indices (b) among the four DOM end-members. “ns” represents nonsignificant differences among the four DOM end-members. Different small letters indicate significant differences at p< 0.05.

Fig. 2.Van Krevelen diagrams for DOM compounds of rainwater (a), groundwater (b), and soil (c). DOM compound classes (d) and elemental molecules (e) of the four DOM end-members.

不同端元间的可溶性有机质数量与质量特征存在显著差异。土壤和地下水中类腐殖质组分(C1C2+C3)占比显著高于雨水,而雨水以类蛋白质组分(C4)为主,荧光指标变化趋势与之一致,表明雨水DOM具有明显的自生源特征,且腐殖化程度低于土壤和地下水。从分子特征看,不同端元间可溶性有机质化合物(不饱和烃、木质素、单宁、缩合芳烃)和元素组成(CHOCHON)均存在显著差异,这些特征差异为不同来源的定量区分提供了基础

径流可溶性有机质特征

Fig. 3.Variations of DOM compound classes (a–h) and elemental molecules (i–l) during rainfall. “ns” represents nonsignificant differences across different hydrological periods. Different small letters indicate significant differences at p < 0.05.

降雨过程径流DOM特征呈现出明显的动态变化。在整个降雨过程中,径流可溶性有机质的木质素类化合物和元素分子式CHO始终占主导地位,氨基糖与单宁占比呈现先升高后降低的趋势。陆源有机质在流量峰值期大量输入,增加了径流可溶性有机质的芳香性和不饱和度

可溶性有机质源动态

Fig. 4.Relative contributions of different sources to runoff DOM during rainfall.
基于端元DOM的差异性,筛选单宁、陆源类腐殖质、元素分子式CHOCHON作为示踪因子,示踪结果表明坡面土壤是可溶性有机质的主要来源(49.2%),其次是河岸土壤(30.3%)、地下水(13.1%)和雨水(7.5%)。降雨期间,坡面坡面土壤贡献率从降雨初期的42.4%上升至流量峰值期的57.6%。然而,在降雨量较小的事件(如Event12)中,河岸带土壤的贡献高于坡面土壤,这说明降雨驱动的水文连通性变化是径流可溶性有机质来源动态的核心调控因子
小结
这项工作将“高频采样→FT-ICR MS分子指纹贝叶斯源解析”全链条联合应用于降雨过程可溶性有机质溯源。降雨期间坡面土壤成为径流可溶性有机质的关键贡献者,凸显了坡面地水土保持对水质保护的重要性。面对未来极端降雨增多,在坡面推行免耕、覆盖种植等措施,或将成为调控流域碳输出的长效之策
作者介绍
肖海兵:副教授、博士生导师,现任职于华中农业大学资源与环境学院。主要从事农业面源污染、生态水文过程、污染源解析等方面的研究,主持或参与国家重点研发计划课题、国家自然科学基金青年项目、区域创新发展联合基金项目等10余项。以第一或通讯作者在Environmental Science & TechnologyWater ResearchWater Resources ResearchJournal of Hydrology等国内外学术期刊发表研究论文20余篇,被引频次600余次;参编专著1部,申请发明专利8项,授权发明专利2项,受Water ResearchJournal of HydrologyJournal of Environmental Management等期刊邀请审稿40余篇。
史志华 教授、博士生导师,现任职于华中农业大学资源与环境学院。国家杰出青年科学基金获得者,带领的“水土流失过程与生态调控创新团队”入选科技部重点领域创新团队。研究方向为土壤侵蚀机理、景观格局与生态过程。主持国家自然科学基金重点项目、国家重点研发计划项目、国家科技支撑等项目30余项。在One EarthEarth-science ReviewsJournal of HydrologyWater ResearchWater Resources ResearchEnvironmental Science & Technology等期刊发表论文180余篇,多次入选Elsevier“中国高被引学者”。担任中国生态学学会和土壤学会理事,中国土壤学会土壤侵蚀与水土保持专业委员会主任、中国生态学会区域生态委员会副主任、中国水土保持学会侵蚀专业委员会副主任,入选“万人计划”科技创新领军人才、中国科学院“百人计划”和教育部“新世纪优秀人才支持计划”。土壤学报、水土保持学报、International Soil and Water Conservation ResearchBiochar等十余种国内外期刊编委。第一完成人获教育部自然科学二等奖和湖北省科技进步二等奖。
参考文献:
Hu XD, Yan WY, Ma SL, Zhao JS, Wang J, Xiao HB*, Shi ZH*. Molecular Evidence from FT-ICR MS and Bayesian Mixing Model Reveals Hillslope Soils as Dominant DOM Contributors during Rainfall. Environmental Science & Technology, 2026. DOI:10.1021/acs.est.6c02514
文章链接

https://pubs.acs.org/doi/10.1021/acs.est.6c02514

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  1. CONNECT:[ UseTime:0.001001s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001525s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000722s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000666s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001280s ]
  6. SELECT * FROM `set` [ RunTime:0.000651s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001508s ]
  8. SELECT * FROM `article` WHERE `id` = 532032 LIMIT 1 [ RunTime:0.001554s ]
  9. UPDATE `article` SET `lasttime` = 1782615965 WHERE `id` = 532032 [ RunTime:0.015766s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000602s ]
  11. SELECT * FROM `article` WHERE `id` < 532032 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001103s ]
  12. SELECT * FROM `article` WHERE `id` > 532032 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005462s ]
  13. SELECT * FROM `article` WHERE `id` < 532032 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003008s ]
  14. SELECT * FROM `article` WHERE `id` < 532032 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004973s ]
  15. SELECT * FROM `article` WHERE `id` < 532032 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010877s ]
0.213287s