摘要
岩溶区具有独特的地质特征,其丰富的地下水系统和活跃的溶蚀过程使其成为可溶性碳的重要储存和转化区域.可溶性碳作为陆地和水生生态系统碳库中最活跃的部分,在全球碳循环中扮演着重要角色.以岩溶区河岸带(草本、灌木、乔木)土壤与漓江水体为研究对象,采用紫外-可见光谱和三维荧光光谱技术分析比较其不同季节溶解性有机质(DOM)来源和组分,探究岩溶区河岸带不同植被类型下土壤和漓江水体DOM含量和组分的动态特征.结果表明,不同植被类型下土壤可溶性碳含量大致表现为丰水季高于枯水季;相对于土壤,不同时期水体的可溶性有机碳(DOC)含量基本一致,而不同时期水体可溶性无机碳(DIC)含量差异显著.不同植被类型下土壤和漓江水体样品紫外吸光度比值E_(2)/E_(3)呈现丰水季高于枯水季;不同植被类型下土壤和漓江水体样品紫外光谱吸收值SUVA_(254)、SUVA_(260)和SUVA_(280)均呈现枯水季高于丰水季,且在枯水季表现为乔木地>灌木地>草本地.三维荧光分析结果表明,在丰水季,类富里酸物质和类腐殖酸类物质占据主导地位;而在枯水季,水体中存在明显的溶解性微生物代谢产物.本研究表明季节的变化会显著影响岩溶区不同植被类型下土壤以及漓江水体DOM的含量和组分.
Karst regions exhibit distinct geological characteristics,with rich groundwater systems and vigorous dissolution processes that make them significant areas for the storage and transformation of soluble carbon.Soluble carbon,the most dynamic component of carbon pools in terrestrial and aquatic ecosystems,plays a crucial role in the global carbon cycle.In this study,we investigated the soil of the riparian zone(herbaceous,shrub,and tree)in the Karst area and the water bodies of the Lijiang River.Ultraviolet-visible spectroscopy and three-dimensional fluorescence spectroscopy techniques were used to analyze and compare the sources and components of dissolved organic matter(DOM)in different seasons,exploring the dynamic characteristics of DOM content and components in the soil under different vegetation types in the riparian zone of the Karst area and in the water body of the Lijiang River.The results show that soluble carbon content in the soil under different vegetation types is approximately greater during the flood season than in the dry season.In contrast,the dissolved organic carbon(DOC)content in the water body remains relatively consistent across periods,while the dissolved inorganic carbon(DIC)content in the water body varies significantly between periods.The ultraviolet absorbance ratio E_(2)/E_(3) of soil and water samples from the Lijiang River under different vegetation types showed that the wet season was greater than the dry season.The ultraviolet spectral absorption values(SUVA_(254),SUVA_(260),and SUVA_(280))of soil and water samples from the Lijiang River under different vegetation types showed that the dry season was greater than the flood season.In the dry season,the order of spectral absorption values was arbor land>shrub land>herb land.Three-dimensional fluorescence analysis results showed that in the flood season,fulvic acid-like and humic acid-like substances dominated,whereas in the dry season,dissolved microbial metabolites were present in the water body.In summary,seasonal changes significantly affected the content and components of DOM in the soil of different vegetation types in the Karst area and in the water of the Lijiang River.
作者
袁宏毅
覃方兴
李琼芳
董鹏举
任亚珍
刘凤起
张标
车明轩
张强
YUAN Hongyi;QIN Fangxing;LI Qiongfang;DONG Pengju;REN Yazhen;LIU Fengqi;ZHANG Biao;CHE Mingxuan;ZHANG Qiang(Institute of Karst Geology,Chinese Academy of Geological Sciences/Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification,Ministry of Natural Resources,Guilin 541004,China;Guilin Karst Geology Observation and Research Station of Guangxi/Guangxi Pingguo Karst Ecosystem National Field Scientific Observation and Research Station,Guilin 541004,China;International Research Centre on Karst under the Auspices of UNESCO/National Center for International Research on Karst Dynamic System and Global Change,Guilin 541004,China;School of Life Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Sichuan Provincial Institute of Forestry and Grassland Inventory and Planning,Chengdu 610000,China)
出处
《应用与环境生物学报》
北大核心
2025年第3期509-517,共9页
Chinese Journal of Applied and Environmental Biology
基金
广西岩溶动力学重大科技创新基地开放课题(BL202104)
西南科技大学自然科学基金项目(22ZX7113)资助。
关键词
可溶性碳
河岸带
岩溶区
三维荧光光谱
紫外光谱
soluble carbon
riparian zone
Karst area
three-dimensional excitation-emission matrix fluorescence spectroscopy
ultraviolet spectrum
作者简介
通信作者:车明轩,E-mail:cmxstbc@163.com;通信作者:张强,zhangq198203@163.com。
