Direct and Indirect Effects of Land Use on Dissolved Organic Matter in a Typical Karst River

被引：1
|
作者：
Zhang L.-L. [1 ,2 ]
Liu R. [1 ,2 ]
Zheng D.-Y. [1 ,2 ]
Zheng C.-G. [3 ,4 ]
Zhang J. [1 ,2 ,3 ]
机构：
[1] School of Geography and Tourism, Chongqing Normal University, Chongqing
[2] Key Laboratory of GIS Application Research, Chongqing Normal University, Chongqing
[3] Chongqing Planning, Natural Resources Survey, Monitoring Institute, Chongqing
[4] Key Laboratory of Monitoring, Evaluation and Early Warning of Territorial Spatial Planning Implementation, Ministry of Natural Resources, Chongqing Planning and Natural Resources Bureau, Chongqing
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 10期
关键词：
direct and indirect effects; dissolved organic matter(DOM); Furong River; land use; partial least squares pathway model(PLS-PM);
D O I：
10.13227/j.hjkx.202209126
中图分类号：
学科分类号：
摘要：
Land use can directly affect the abundance of riverine dissolved organic matter (DOM) by transporting terrestrial organic matter to rivers and can also indirectly enhance local production of DOM by increasing riverine nutrient loading. This study investigated the characteristics and spatial distribution of DOM components in the Furong River during the rainy season (July) using ultraviolet-visible light absorption spectroscopy (UV-VIS) and three-dimensional excitation emission matrix fluorescence spectroscopy-parallel factor analysis (EEM-PARAFAC) techniques. Furthermore, correlation analysis and the partial least squares path model (PLS-PM) were used to identify and quantify the direct and indirect impacts of land use on DOM at multiple scales. The results revealed that: 1 the direct effects of land use on DOM were generally stronger than the indirect effects. 2 The responses of different DOM components to riverine nutrient status and land use varied, with dissolved organic carbon (DOC) and colored dissolved organic matter (CDOM) components being more susceptible to riverine nutrient status and fluorescent dissolved organic matter (FDOM) being more sensitive to land use. 3 The direct impact intensity of land use on DOC and CDOM fluctuated slightly with the spatial scale, but the total impact intensity had no visible spatial scale difference, and the direct impact intensity on the FDOM component decreased with the increase in spatial scale. 4 Dryland, urban and other construction land, patch density (PD), edge density (ED), and Shannon's diversity index (SHDI) were typical land use metrics that exacerbated DOM abundance, whereas paddy field, shrubland, largest patch index (LPI), and aggregation index (AI) were typical land use metrics that effectively mitigated DOM abundance. Total nitrogen (TN), nitrate nitrogen (NO3--N), and dissolved total phosphorus (DTP) were water quality parameters that were significantly affected by land use and were closely related to DOM components, that is, nitrogen and phosphorus played an important “intermediary” role in “land use-riverine DOM.” FDOM could be used as indicators to measure the strength of terrestrial organic matter directly input to rivers by land use. © 2023 Science Press. All rights reserved.
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页码：5511 / 5523
页数：12
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