Characteristics of bacterial community in the water and surface sediment of the Yellow River, China, the largest turbid river in the world

2014 ◽  
Vol 14 (11) ◽  
pp. 1894-1904 ◽  
Author(s):  
Na Xia ◽  
Xinghui Xia ◽  
Ting Liu ◽  
Lijuan Hu ◽  
Baotong Zhu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Surface Sediment ◽  
Yellow River ◽  
The Yellow River ◽  
The World

scholarly journals Variation in Bacterial Community Structure in Rhizosphere and Bulk Soils of Different Halophytes in the Yellow River Delta

2022 ◽  
Vol 9 ◽  
Author(s):  
Yinghan Zhao ◽  
Tian Li ◽  
Pengshuai Shao ◽  
Jingkuan Sun ◽  
Wenjing Xu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Rhizosphere Soil ◽  
Yellow River ◽  
Bacterial Community Composition ◽  
Yellow River Delta ◽  
Bulk Soil ◽  
The Yellow River ◽  
The Yellow River Delta ◽  
Α Diversity

Soil microorganisms play the important role in driving biogeochemical cycles. However, it is still unclear on soil microbial community characteristics and microbial driving mechanism in rhizosphere and bulk soils of different halophyte species. In this study, we analyzed bacterial communities in the rhizosphere and bulk soils of three typical halophytes in the Yellow River Delta, i.e., Phragmites communis, Suaeda salsa, and Aeluropus sinensis, by high-throughput sequencing. The contents of total carbon, total nitrogen, and available phosphorus in rhizosphere soils of the three halophytes were significantly higher than those in bulk soils, which suggested a nutrient enrichment effect of the rhizosphere. Rhizosphere soil bacterial α-diversity of P. communis was higher than that in bulk soil, whereas bacterial α-diversity in rhizosphere soil of S. salsa and A. sinensis was lower than those in bulk soil. The dominant bacterial phyla were Proteobacteria, Actinobacteria, Chloroflexi, and Bacteroidetes, which accounted for 31, 20.5, 16.3, and 10.3%, respectively. LDA effect size (LEfSe) analysis showed that the bacterial species with significant differences in expression abundance was obviously different in the rhizosphere and bulk soil of three halophytes. The principal component analysis (PCoA) showed that bacterial community composition was greatly different between rhizosphere and bulk soils of P. communis and S. salsa, while no difference in A. sinensis. Changed bacterial community composition was mainly ascribed to salinity in rhizosphere and bulk soils. Additionally, salinity was positively correlated with Bacteroidetes and negatively correlated with Actinobacteria and Acidobacteria. Our study clarified the variation in bacterial community structure between rhizosphere and bulk soils with soil physicochemical properties, which proved a biological reference to indicate the characteristics of saline and alkaline land.

Heavy metals in the riverbed surface sediment of the Yellow River, China

2016 ◽  
Vol 23 (24) ◽  
pp. 24768-24780 ◽  
Author(s):  
Qingyu Guan ◽  
Ao Cai ◽  
Feifei Wang ◽  
Lei Wang ◽  
Tao Wu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Surface Sediment ◽  
Yellow River ◽  
The Yellow River

Sediment and State in Imperial China: The Yellow River Watershed as an Earth System and a World System

2016 ◽  
Vol 11 (2) ◽  
pp. 121-147 ◽  
Author(s):  
Ruth Mostern
Keyword(s):  
Landscape Change ◽  
Spatial Organization ◽  
Yellow River ◽  
The Yellow River ◽  
Earth System ◽  
The Loess Plateau ◽  
The World ◽  
Fragile Environment ◽  
Imperial China

China’s Yellow River is the most sediment laden water course in the world today, but that came to be the case only about a thousand years ago. It is largely the result of agriculture and deforestation on the fragile environment of the loess plateau in the middle reaches of the watershed. This article demonstrates that the long term environmental degradation of the Yellow River was primarily anthropogenic, and furthermore, it explains how the spatial organization of state power in imperial China amplified the likelihood and consequences of landscape change.

A Tale of Two Deltas: Comparative Study on the Effects of Dam Regulation on Deltaic Hydrological Regime and Morphological Evolution

2021 ◽  
Author(s):  
Weilun Gao ◽  
Dongxue Li ◽  
Mawusi Amenuvor ◽  
Yao Tong ◽  
Dongdong Shao ◽  
...  
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Morphological Evolution ◽  
Hydrological Regime ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
Quasi Equilibrium ◽  
The Yellow River Delta ◽  
The World

<p>Deltas are among the most populous areas and most productive ecosystems on Earth. Despite their critical importance for human society and coastal ecosystems, many of the world’s deltas are drowning due to substantial decrease in sediment supply, sea level rise, etc. Previous studies have demonstrated the effects of dam regulation on the hydrological regime and morphological evolution of river deltas. However, past attention was mostly paid to individual deltas or deltas at a global scale, while comparative studies on selected deltas are scarce in the literature. In this study, a comparative study on two wave-influenced deltas, namely, the Volta River Delta in Ghana and the Yellow River Delta in China, was conducted. The trend of change of the annual river discharge and sediment load of the two deltas before and after the construction of the major dams were analyzed, and the resultant effects on deltaic morphological evolution were also examined and compared between the two deltas. The results show that the average annual river discharge and sediment load and their inter-annual variation decreased significantly after the construction of major upstream dams for both deltas. However, presumably due to the differences in reservoir capacity and upstream location of the dams, the sediment load of the Volta River Delta decreased abruptly to <10% of the sediment load in the pre-dam period after the construction of the Akosombo Dam in 1964 and became stable afterwards, whereas the sediment load of the Yellow River Delta decreased substantially to ~10% of pre-dam level but in a more gradual stepwise manner since the 1950s. As a result, after the intense shoreline retreat in the 1960s, the delta area of the Volta River Delta appeared to adjust to the reduced yet stable sediment load and shift to a new quasi-equilibrium with minimal change (maximum 0.53%). On the contrary, the Yellow River Delta still kept prograding at the river mouth given the current sediment load. However, it is foreseeable that if the trend of sediment reduction persists, it may potentially turn net delta progradation to erosion and further into a new quasi-equilibrium like the Volta River Delta. Our study provides a new perspective for understanding the future evolution of the Yellow River Delta as well as other deltas around the world that share similar characteristics and forcing factors.</p>

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