Article
Engineering, Civil
Wei Ouyang, Pengtao Wang, Shaoqing Liu, Xin Hao, Zeshan Wu, Xintong Cui, Ri Jin, Weihong Zhu, Chunye Lin
Summary: The study revealed that carbon dioxide emissions in the Shuidong forest wetland catchment were mainly controlled by ecosystem respiration instead of gross primary production, and were significantly correlated with air temperature and relative humidity. Additionally, hydrological transport from upland forests may trigger the soil priming effect, leading to higher CO2 emissions within the local footprint area.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
L. J. Hall, E. J. S. Emilson, B. Edwards, S. A. Watmough
Summary: This study evaluated changes in lake and peat porewater chemistry in the Sudbury area and found that DOC concentrations increased over time, primarily affected by increasing pH and decreasing lake SO4 concentration. Strong relationships between DOC and pH (positive) and SO4 (negative) were observed in lakes, indicating that recovery from acidic deposition is the main factor contributing to the increase in DOC in Sudbury lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Forestry
Jianfeng Hou, Fei Li, Zhihui Wang, Xuqing Li, Rui Cao, Wanqin Yang
Summary: Dissolved carbon (DC) in forest streams plays a crucial role in maintaining the structure and productivity of adjoining aquatic ecosystems as well as informing biogeochemical links between mountain forests and adjoining rivers. However, the functions of forest stream DC dynamics are rarely incorporated into river management. This study investigated the seasonal dynamics of DC in 15 representative forest streams in a geographically fragile subalpine-gorge catchment in the upper reaches of the Yangtze River. The results showed that precipitation, temperature, water discharge rate, and sediment depth regulated the stocks and export rates of DC and its components. Forest streams are important links between the carbon biogeochemical cycle of subalpine forests and adjoining streams.
Article
Environmental Sciences
Lee Potter, Y. Jun Xu
Summary: The Mississippi River discharges a large amount of carbon into the Northern Gulf of Mexico annually, playing a vital role in the ecosystem. This study found that seasonal variability and extreme weather events strongly affect carbon transfer between land and water, and climate change is likely to intensify carbon export from the Mississippi River Basin.
Article
Environmental Sciences
Zuhao Zhu, Huihua Wei, Yao Guan, Li Zhang, Renming Jia, Pengfei Sun, Yang Yang, Zhen Zhang, Qiufeng Zhang
Summary: This study reveals notable spatial and seasonal variations in the concentration, source, and mixing of dissolved organic matter (DOM) at the land-ocean interface. DOM in the northern Beibu Gulf is influenced by river discharge, anthropogenic input, and in situ biological activity. The mixing behavior of DOM varies between nearshore and offshore waters.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Agricultural Engineering
Fidelis Odedishemi Ajibade, Hong-Cheng Wang, Awoke Guadie, Temitope Fausat Ajibade, Ying-Ke Fang, Hafiz Muhammad Adeel Sharif, Wen-Zong Liu, Ai-Jie Wang
Summary: Biochar was used to enhance the removal of organic and nitrogen from secondary wastewater in constructed wetlands. Adding 1% biochar and microbes significantly increased the removal efficiencies of COD and nitrogen, while the release of dissolved organic carbon from biochar promoted nitrogen removal. RNA gene sequencing analysis showed enhanced growth of bacteria in biochar-amended systems.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Marloes Groeneveld, Dolly N. Kothawala, Lars J. Tranvik
Summary: Streams and rivers play a crucial role in the global carbon cycle by transporting carbon from terrestrial ecosystems to the oceans. In agricultural areas, streams often experience increased concentrations of suspended mineral particles from soil erosion, leading to the adsorption of dissolved organic carbon (DOC) to particles and its retention in sediment. The extent of adsorption varies with the seasonal changes in the molecular composition of dissolved organic matter (DOM). This study conducted monthly sampling in a agriculturally impacted river in Sweden and found that the adsorption potential was highest when the riverine DOM had a terrestrial character. The adsorption extent was negatively related to base cation concentrations, particularly calcium.
Article
Environmental Sciences
D. F. Senger, D. A. Saavedra Hortua, S. Engel, M. Schnurawa, N. Moosdorf, L. G. Gillis
Summary: Mangroves are effective blue carbon sinks and have the highest carbon content on earth, but their areal extent has declined significantly in recent decades. Degraded mangrove forests can lead to increased carbon release into the atmosphere, and hypersaline conditions in degraded areas may cause mangrove dieback. Sediment CO2 efflux in degraded sites is lower than other studies, providing insights into carbon dynamics in slowly degrading mangrove systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Biodiversity Conservation
Dawid Kupka, Piotr Gruba
Summary: This study revealed that forest soils have different sorption capacities for DOC released from litter of different tree species under varying pH conditions, indicating the significant effects of soil pH and litter chemical composition on DOC stabilization.
ECOLOGICAL INDICATORS
(2022)
Article
Engineering, Environmental
Fidelis Odedishemi Ajibade, Wan-Xin Yin, Awoke Guadie, Temitope Fausat Ajibade, Ying Liu, Mathieu Nsenga Kumwimba, Wen-Zong Liu, Jing-Long Han, Hong-Cheng Wang, Ai-Jie Wang
Summary: This study explored the feasibility and mechanism of biochar-amended constructed wetlands for regulating the removal of sulfamethoxazole and accumulation of antibiotic resistance genes in low C/N wastewater. Results showed that biochar amendment significantly enhanced the oxidation and reduction reactions in the wetlands, leading to improved removal of COD, nitrogen, and sulfamethoxazole, as well as reduced accumulation of antibiotic resistance genes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Katharina Blaurock, Phil Garthen, Maria P. da Silva, Burkhard Beudert, Benjamin S. Gilfedder, Jan H. Fleckenstein, Stefan Peiffer, Oliver J. Lechtenfeld, Luisa Hopp
Summary: The transport of dissolved organic carbon (DOC) from soils to inland waters is crucial for the global carbon cycle. The interplay between microtopography and groundwater level dynamics plays a significant role in DOC export.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Water Resources
Adrienne A. Ducharme, Nora J. Casson, Scott N. Higgins, Karl Friesen-Hughes
Summary: This study found that landscape characteristics, particularly wetland coverage, can influence the variation in DOC concentrations during hydrological events in boreal headwater streams. Differences between catchments were more prominent during summer and fall events, while less apparent during early spring melt events.
HYDROLOGICAL PROCESSES
(2021)
Article
Agronomy
Suphathida Aumtong, Chakrit Chotamonsak, Paweenuch Pongwongkam, Kanchana Cantiya
Summary: The influence of long-term chemical fertilization in paddy soils on SOC is attributed to the interaction between labile carbon and phosphorus fractions. In the 0-5 cm soil layer, easily oxidized organic carbon components and other soil physicochemical characteristics have a stronger interaction with SOC. An increase in DOC in this layer significantly lowers SOC, which is positively correlated with POXC but negatively correlated with SOC and WSC. The changes in SOC can be explained by the relationship between DOC and inorganic phosphate fractions under specific soil pH conditions.
Article
Environmental Sciences
Hongyang Chen, Changming Fang, Ming Nie
Summary: The sensitivity of wetland SOC decomposition to temperature change may be overestimated, especially in alkaline or high-SOC soils, if DOC flux is not considered. Therefore, C-climate models should incorporate DOC flux when predicting wetland C loss in response to warming.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Engineering, Environmental
Joeri Kaal, Marta Perez-Rodriguez, Harald Biester
Summary: Peatlands and coniferous forests in the Northern Hemisphere and Central Europe are experiencing significant environmental changes, resulting in browning of surface waters and elevated concentrations of dissolved organic matter (DOM) and metals. This has implications for global carbon cycle, peatland and forest management, and water treatment. A study in the Harz Mountains, Germany, found strong relationships between DOM and metals, with seasonal variations in DOM quality and DOM-metal binding mode. The products of polyphenols play a key role in DOM-metal complexes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)