Sediment and carbon dynamics during an episodic flood in an intermittent river
Sediment and carbon dynamics during an episodic flood in an intermittent river
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间歇性河流间歇性洪水期间的沉积物和碳动态
DOI：
10.1002/ecs2.4248
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发表时间：
2022-10
期刊：
影响因子：
2.7
通讯作者：
Changwei Lu
中科院分区：
文献类型：
--
作者：
Xinyu Liu;Xixi Lu;Ruihong Yu;Heyang Sun;Yuan Li;Zhen Qi;Hao Xue;Zhuangzhuang Zhang;Zhengxu Cao;Tingxi Liu;Changwei Lu
间歇性河流和短暂溪流（IRES）对全球碳循环的贡献在很大程度上被忽视了。洪水事件可以影响水文过程、碳(C)运输和二氧化碳（CO2）排放。本研究监测了洪水期间间歇河流的流量和沉积物浓度。测定了水样的水质因子和碳输运指数。还分析了co2分压（pCO2）和co2通量（FCO2）。利用遥感数据对流域土壤侵蚀进行了分析。结果表明：洪涝总输沙量约为5503.1 t，泥沙浓度与流量有直接关系；通过完成滞回线和土壤侵蚀水平分析，发现河源土壤侵蚀和径流面冲刷是泥沙的主要来源。洪水显著增加了颗粒有机碳，降低了溶解有机碳。洪涝期pco2变化在669 ~ 1229 ppm之间，表明IRES具有碳源作用，pH和总溶解固形物是主要影响因素。fco_2在20.16 ~ 568.33 mg m−2h−1之间变化，与pCO2呈显著正相关。洪水结束后，二氧化碳排放量增加，并在很长一段时间内保持在高位。研究结果对IRES对极端洪水事件的响应具有重大意义，预计在气候变化的情况下，极端洪水事件的强度会增加。
The contribution of intermittent rivers and ephemeral streams (IRES) to the global carbon cycle has largely been overlooked. Flood events can impact hydrological processes, carbon (C) transport, and carbon dioxide (CO2) emissions. This study monitored river flow and sediment concentrations in an intermittent river during a flood event. Water samples were measured for water quality factors and C transport indices. CO2partial pressure (pCO2) and CO2flux (FCO2) were also analyzed. Remote sensing data were used to analyze soil erosion in the basin. Results indicate that the total sediment load from the flood was approximately 5503.1 t, with sediment concentrations showing a direct relationship with flow discharge. By completing a hysteresis loop and soil erosion level analysis, soil erosion from the river source and runoff surface scour were found to be the primary sources of sediment. The flood significantly increased particulate organic carbon and decreased dissolved organic carbon. During the flood, pCO2ranged between 669 and 1229 ppm, indicating that the IRES served as a carbon source, with pH and total dissolved solids being the main influencing factors. TheFCO2varied between 20.16 and 568.33 mg m−2h−1and revealed a significant positive correlation with pCO2. After the flood ended, CO2emissions increased and remained high for a long time. The study findings have substantial implications for IRES responses to extreme flood events, which are predicted to increase in intensity under climate change.
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影响因子：
2.7
作者：
I. Muñoz;Meritxell Abril;J. P. Casas‐Ruiz;M. Casellas;L. Gómez‐Gener;R. Marcé;M. Menéndez;B. Obrador;S. Sabater;D. Schiller;V. Acuña
通讯作者：
I. Muñoz;Meritxell Abril;J. P. Casas‐Ruiz;M. Casellas;L. Gómez‐Gener;R. Marcé;M. Menéndez;B. Obrador;S. Sabater;D. Schiller;V. Acuña
DOI：
10.1002/2016jg003713
发表时间：
2017-06
期刊：
Journal of Geophysical Research: Biogeosciences
影响因子：
--
作者：
L. Ran;Lingyu Li;M. Tian;Xiankun Yang;R. Yu;Ji Zhao;Lixin Wang;Xixi Lu
通讯作者：
L. Ran;Lingyu Li;M. Tian;Xiankun Yang;R. Yu;Ji Zhao;Lixin Wang;Xixi Lu
影响因子：
2.6
作者：
Elosegi, Arturo;Diez, Joserra;Mutz, Michael
通讯作者：
Mutz, Michael
影响因子：
4
作者：
R. Sánchez-Andrés;S. Sánchez-Carrillo;M. J. Ortíz-Llorente;M. Álvarez-Cobelas;S. Cirujano
通讯作者：
R. Sánchez-Andrés;S. Sánchez-Carrillo;M. J. Ortíz-Llorente;M. Álvarez-Cobelas;S. Cirujano
影响因子：
4.5
作者：
S. Ruíz‐Halpern;D. Maher;I. Santos;B. Eyre
通讯作者：
S. Ruíz‐Halpern;D. Maher;I. Santos;B. Eyre