Bacterial communities along a 4500-meter elevation gradient in the sediment of the Yangtze River: what are the driving factors?

2020 ◽  
Vol 177 ◽  
pp. 109-130
Author(s):  
Wenlong Zhang ◽  
Haolan Wang ◽  
Yi Li ◽  
Xiaoxiao Zhu ◽  
Lihua Niu ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Yangtze River ◽  
Elevation Gradient ◽  
Driving Factors ◽  
The Yangtze River

scholarly journals Driving Factors and Dynamics of Phytoplankton Community and Functional Groups in an Estuary Reservoir in the Yangtze River, China

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1184 ◽  
Author(s):  
Changtao Yang ◽  
Jing Nan ◽  
Jianhua Li
Keyword(s):  
Water Temperature ◽  
Functional Groups ◽  
Yangtze River ◽  
Light Availability ◽  
Ecological Status ◽  
Water Source ◽  
Driving Factors ◽  
Nutrient Concentrations ◽  
Drinking Water Source ◽  
The Yangtze River

Qingcaosha Reservoir, an estuary reservoir on the Yangtze River and a drinking water source, is facing phytoplankton blooms and the factors driving changes in phytoplankton composition and distribution have not been well understood so far. To facilitate the understanding of this problem, we collected surface water samples from January to December 2014 monthly at 12 sampling sites. A total of 205 taxa classified into eight major taxonomic groups were identified. Cyclotella meneghiniana, Melosira varians, Melosira granulata, Cryptomonas ovata and Chlorella vulgaris were the species dominating at least one season. The long stratification period and high nutrient concentration resulted in high chlorophyll a concentration (36.1 ± 18.5 μg L−1) in the midstream and downstream during summer, and mass phytoplankton growth and sedimentation process led to nutrients decrease. In the reservoir, neither P or N limitation was observed in the study period. We observed that water temperature, nutrient concentrations and light availability (Zeu/Zmix) are critical in selecting functional groups. These results highlight that the functional groups characterized the water body well and showed a good ecological status based on the assemblage index (Q average = 4.0). This work also highlights that mixing regime, water temperature and light availability were the driving factors that determine phytoplankton dynamics.

Integrated biogeography and assembly process of planktonic and sedimentary bacterial communities in the Yangtze River

2020 ◽  
Author(s):  
Tang Liu ◽  
Jiawen Wang ◽  
Shufeng Liu ◽  
Qian Chen ◽  
Chunmiao Zheng ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Yangtze River ◽  
Selection Process ◽  
Anthropogenic Impacts ◽  
Spatiotemporal Pattern ◽  
Assembly Process ◽  
The Yangtze River ◽  
Species Sorting ◽  
Biogeographic Patterns ◽  
Water And Sediment

<p>Bacterial communities are essential to the biogeochemical cycle in riverine ecosystems. However, the integrated biogeography and assembly process of planktonic and sedimentary bacterial communities in large rivers is still poorly understood. Here, the study provided the spatiotemporal pattern of bacterial communities in the Yangtze River of 4300 km continuum, which is the largest river in Asia. We found that the taxa in sediments are the main contributors to the bacterial diversity of the river ecosystem since sediments sub-group took 98.8% of the total 38, 904 Operational Taxonomic Units (OTUs) observed in 280 samples. Seasonal differences in bacterial communities were statistically significant in water, whereas bacterial communities in both water and sediment were geographically clustered according to five types of landforms: mountain, foothill, basin, foothill-mountain, and plain. Interestingly, the presence of two huge dams resulted in a drastic fall of bacterial taxa in sediment immediately downstream due to severe riverbed scouring. The integrity of the biogeography was satisfactorily interpreted by the combination of neutral and species sorting perspectives in meta-community theory for bacterial communities in flowing water and sediment. Although deterministic process had dominant influence on assembly processes in water and sediment communities, homogeneous selection was the main contributor in water, while combination of homogeneous selection and variable selection contributed selection process in sediment. In addition, homogenizing dispersal played more important role in community assembly process in sediment than water. Our study fills a gap in understanding of biogeography and assembly process of bacterial communities in one of the world’s largest river and highlights the importance of both planktonic and sedimentary communities to the integrity of bacterial biogeographic patterns in a river subject to varying natural and anthropogenic impacts.</p>

scholarly journals Analysis of China’s Industrial Green Development Efficiency and Driving Factors: Research Based on MGWR

2021 ◽  
Vol 18 (8) ◽  
pp. 3960
Author(s):  
Ke Liu ◽  
Yurong Qiao ◽  
Qian Zhou
Keyword(s):  
Economic Development ◽  
Technological Innovation ◽  
Yangtze River ◽  
Industrial Development ◽  
Government Regulation ◽  
Industrial Structure ◽  
Driving Factors ◽  
The Yangtze River ◽  
Green Development ◽  
The Government

With increasingly severe constraints on resources and the environment, it is the mainstream trend of economic development to reduce industrial pollution emissions and promote green industrial development. In this paper, a super-efficiency slacks-based measure (SBM) model is adopted to measure the industrial green development efficiency (IGDE) of 289 cities in China from 2008 to 2018. Moreover, we analyze their spatiotemporal differentiation pattern. On this basis, the multiscale geographical weighted regression (MGWR) model is used to analyze the scale differences and spatial differences of the driving factors. The results show that the IGDE is still at a low level in China. From 2008 to 2018, the overall polarization of IGDE was relatively serious. The number of high- and low-efficiency cities increased, while that of medium-efficiency cities greatly decreased. Secondly, the IGDE presented an obvious spatial positive correlation. MGWR regression results show that the technological innovation, government regulation, and consumption level belonged to the global scale, and there was almost no spatial heterogeneity. Other driving factors were urbanization, industrial structure, economic development, and population density according to their spatial scale. Lastly, the influence of economic development and technological innovation had a certain circular structure in space; the influence of population size mainly occurred in the cities of the southeast coast and northeast provinces; the influence of urbanization was more obvious in the most northern provinces of the Yangtze River, while that of industrial structure was mainly concentrated in the most southern cities of the Yangtze River Economic Belt (YREB). Spatially, the influence of consumption was manifested as a distribution trend of decreasing from north to south, and the government regulation was manifested as increasing from west to east and then to northeast.

scholarly journals Decoupling of Economic Growth to Industrial Wastewater Discharge in the Yangtze River Delta

2021 ◽  
Vol 251 ◽  
pp. 02068
Author(s):  
Zhang Kunjie
Keyword(s):  
Economic Growth ◽  
Industrial Wastewater ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
Structural Effect ◽  
River Delta ◽  
Driving Factors ◽  
The Yangtze River ◽  
Wastewater Discharge ◽  
The Yangtze River Delta

Based on inter-provincial panel data from 2010 to 2018, the author conducted quantitative analysis on the decoupling of economic growth and industrial wastewater discharge as well as its driving factors in the Yangtze River Delta. The research shows during the study period, a high level of decoupling between economic growth and industrial wastewater discharge could be seen in the Yangtze River Delta, mainly in the form of strong decoupling, while at the same time, undesirable conditions such as growth linkages and expansive negative decoupling, still existed in a few years and certain regions. Among the studied regions, Anhui Province, Zhejiang Province and Jiangsu Province all share a similar decoupling pattern with a rather stable overall performance. Shanghai, however, performed poorly among the Yangtze River Delta, with undesirable decoupling states detected in a few years. In terms of driving factors, technology is the core factor that drives the decoupling of economic development to industrial wastewater discharge of the region. The structural effect, on the other hand, is another element worth paying attention to as the technology in the region gradually becomes saturated.

scholarly journals Research on the Measurement, Evolution, and Driving Factors of Green Innovation Efficiency in Yangtze River Economic Belt: A Super-SBM and Spatial Durbin Model

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Renyan Long ◽  
Hangyuan Guo ◽  
Danting Zheng ◽  
Ronghua Chang ◽  
Sanggyun Na
Keyword(s):  
Economic Growth ◽  
Sustainable Development ◽  
Environmental Pollution ◽  
Yangtze River ◽  
Industrial Structure ◽  
Driving Factors ◽  
Government Support ◽  
The Yangtze River ◽  
Green Innovation

With the shortage of resources and the increasingly serious environmental pollution in China, green innovation has become a sustainable competition for a region. The Yangtze River Economic Belt (YREB) strategy is one of the most important strategies for the sustainable development of China’s economy under the new normal. Green innovation plays a linking role in the resources exchange and trade flow in YREB, and it is also the foundation and guarantee to implement the YREB strategy. The global environmental pollution and the weak recovery of world economy make the traditional extensive economic growth model unsustainable. Sustainable economic growth should focus on the quality of development and its external costs to the environment. In order to implement the concept of sustainable development, the improvement of logistics ecological efficiency is related to the quality of ecological civilization construction. Therefore, it is of theoretical and practical significance to study the measurement, evolution, and driving factors of coordinated development level of regional green innovation system. This paper proposes a super-slack-based measure (super-SBM) data envelopment analysis (DEA) model to measure the green innovation efficiency of 11 provinces and cities in YREB from 2008 to 2017, mastering its spatial and evolutionary characteristics, and conduct empirical analysis on the influencing factors. The empirical results indicate that economic development, government support, and industrial structure upgrading are the leading forces to directly enhance the green technology innovation ability of cities in the Yangtze River Economic belt and play the core driving role of green innovation. To further enhance the capacity of urban green innovation in the Yangtze River Economic belt, we will increase the government’s support for green innovation, optimize the environmental governance model, promote the green upgrading of industrial structure, and enhance the enthusiasm of enterprises for green innovation.

Dispersal limitation drives biogeographical patterns of anammox bacterial communities across the Yangtze River

2020 ◽  
Vol 104 (12) ◽  
pp. 5535-5546
Author(s):  
Liming Chen ◽  
Sitong Liu ◽  
Qian Chen ◽  
Guibing Zhu ◽  
Xuan Wu ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Yangtze River ◽  
Dispersal Limitation ◽  
The Yangtze River
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