Effects of land use on the characteristics and composition of fluvial chromophoric dissolved organic matter (CDOM) in the Yiluo River watershed, China
Effects of land use on the characteristics and composition of fluvial chromophoric dissolved organic matter (CDOM) in the Yiluo River watershed, China
复制标题
土地利用对伊洛河流域河流有色溶解有机物(CDOM)特征和组成的影响
DOI：
10.1016/j.ecolind.2020.106332
复制
发表时间：
2020-07
影响因子：
6.9
通讯作者：
Wang Tao
中科院分区：
文献类型：
--
作者：
Shao Tiantian;Wang Tao
有色溶解有机物(CDOM)是反映淡水水质、生物地球化学状态和营养物质含量的重要指标。土地利用影响河流中CDOM的浓度、质量、来源和年龄。为了研究河流相CDOM的特征和组成，以及土地利用对碳组分的影响，于2017年5月对伊洛河流域的37个样点进行了采样，中国。此外，还在实验室和室内测定了CDOM的水分参数、吸收光谱和荧光光谱参数。部分样品呈现非典型的CDOM吸收曲线，其吸收峰位于390 nm。CDOM在440 nm处的吸收[aCDOM(440)]与溶解有机碳(DOC)和荧光强度(FN)呈正相关。荧光激发-发射光谱表明，存在强烈的类腐殖质和类色氨酸的荧光团，揭示了陆地和人类活动的影响。近期原地贡献指数(Bix)和腐殖化指数(Hix)值较低，表明原地生产是CDOM水平的重要贡献者。农田为主的次流域表现出较高的aCDOM(440)，FN和DOC较高，森林为主的次流域表现出较低的CDOM浓度。在河岸缓冲区尺度上，建基区的CDOM浓度最高。此外，在西南和河岸缓冲尺度上，建成区对DOC和CDOM的浓度都有很大的影响，建成区可以解释西南尺度上碳组分总体变化的%以上和河岸缓冲尺度上DOC变化的46%。总体而言，我们的研究结果表明，河流相CDOM的性质依赖于周围的土地利用，进一步强调了土地利用对SWS和河岸缓冲区CDOM光反应的重要性。
Chromophoric dissolved organic matter (CDOM) is a key indicator of water quality, biogeochemical state and nutrient content in freshwaters. Land use affects the concentration, quality, source, and age of CDOM in rivers. To investigate the characteristics and composition of fluvial CDOM and the effects of land use on carbon components, 37 sites were sampled during May 2017 in the Yiluo River watershed, China. In addition, water parameters, absorption and fluorescence spectral parameters of CDOM were measuredin situand in the lab. Some samples showed atypical CDOM absorption curves with an absorption shoulder at 390 nm. CDOM absorption at 440 nm [aCDOM(440)] was positively correlated with dissolved organic carbon (DOC) and fluorescence intensity (Fn). Fluorescence excitation-emission spectra indicated the presence of strong humic-like and tryptophan-like fluorophores revealing terrestrial, anthropogenic influence. Low recent autochthonous contribution index (BIX) and humification index (HIX) values indicated that autochthonous production was an important contributor to CDOM levels. Cropland-dominated subwatersheds (SWs) exhibited high aCDOM(440), Fn and DOC and forest-dominated SWs showed low CDOM concentration. At the riparian buffer scale, CDOM in the built-up-dominated areas showed the highest CDOM concentration. Moreover, built-up areas greatly influenced the concentrations of DOC and CDOM quantificationally at both the SW and riparian buffer scales; more than 64% of the overall variation in carbon components at the SW scale and 46% of DOC variation at the riparian buffer scale was explained by built-up areas. Overall, the results of our study showed that the properties of fluvial CDOM are dependent on the surrounding land use, further highlighting the importance of land use for CDOM photoreactivity in SWs and riparian buffer zones.
登录
查看更多内容
荧光峰积分比 IC：IT 作为追踪发色溶解有机物成分变化的新潜在指标
影响因子：
9.8
作者：
Zhou Yongqiang;Shi Kun;Zhang Yunlin;Jeppesen Erik;Liu Xiaohan;Zhou Qichao;Wu Huawu;Tang Xiangming;Zhu Guangwei
通讯作者：
Zhu Guangwei
黄土高原西部高海拔地区浑浊水域DOC和CDOM特征及其关系
影响因子：
2.7
作者：
Shao Tiantian;Wang Tao;Liang Xiaowen;Xu Honglian;Li liuyang
通讯作者：
Li liuyang
影响因子：
9.8
作者：
Dale, VH;Joyce, LA;Neilson, RP
通讯作者：
Neilson, RP
影响因子：
3.7
作者：
Ngoye, E;Machiwa, JF
通讯作者：
Machiwa, JF
影响因子：
11.4
作者：
Hosen, Jacob D.;McDonough, Owen T.;Palmer, Margaret A.
通讯作者：
Palmer, Margaret A.