scholarly journals An Analysis to the Settlement and Evolution Characteristics and Driving Forces of Pastoral Areas—A Case Study of Zhenglan Banner

2017 ◽  
Vol 06 (03) ◽  
pp. 147-156
Author(s):  
素丽 张
Keyword(s):  
Driving Forces ◽  
Evolution Characteristics

scholarly journals How Do Trade-Offs and Synergies between Ecosystem Services Change in the Long Period? The Case Study of Uxin, Inner Mongolia, China

2019 ◽  
Vol 11 (21) ◽  
pp. 6041 ◽  
Author(s):  
Zhang ◽  
Li ◽  
Buyantuev ◽  
Bao ◽  
Zhang
Keyword(s):  
Ecosystem Services ◽  
Inner Mongolia ◽  
Stepwise Regression ◽  
Driving Forces ◽  
Extended Period ◽  
Trade Offs ◽  
Development And Utilization ◽  
Long Term Trends

Ecosystem services management should often expect to deal with non-linearities due to trade-offs and synergies between ecosystem services (ES). Therefore, it is important to analyze long-term trends in ES development and utilization to understand their responses to climate change and intensification of human activities. In this paper, the region of Uxin in Inner Mongolia, China, was chosen as a case study area to describe the spatial distribution and trends of 5 ES indicators. Changes in relationships between ES and driving forces of dynamics of ES relationships were analyzed for the period 1979–2016 using a stepwise regression. We found that: the magnitude and directions in ES relationships changed during this extended period; those changes are influenced by climate factors, land use change, technological progress, and population growth.

scholarly journals The roles of vertical advection and eddy diffusion in the equatorial mesospheric semi-annual oscillation (MSAO)

2013 ◽  
Vol 13 (15) ◽  
pp. 7813-7824 ◽  
Author(s):  
R. L. Gattinger ◽  
E. Kyrölä ◽  
C. D. Boone ◽  
W. F. J. Evans ◽  
K. A. Walker ◽  
...  
Keyword(s):  
Driving Forces ◽  
Eddy Diffusion ◽  
Equatorial Region ◽  
Local Times ◽  
Model Simulations ◽  
Vertical Advection ◽  
Diffusion Rates ◽  
D Model ◽  
Vertical Eddy

Abstract. Observations of the mesospheric semi-annual oscillation (MSAO) in the equatorial region have been reported dating back several decades. Seasonal variations in both species densities and airglow emissions are well documented. The extensive observations available offer an excellent case study for comparison with model simulations. A broad range of MSAO measurements is summarised with emphasis on the 80–100 km region. The objective here is not to address directly the complicated driving forces of the MSAO, but rather to employ a combination of observations and model simulations to estimate the limits of some of the underlying dynamical processes. Photochemical model simulations are included for near-equinox and near-solstice conditions, the two times with notable differences in the observed MSAO parameters. Diurnal tides are incorporated in the model to facilitate comparisons of observations made at different local times. The roles of water vapour as the "driver" species and ozone as the "response" species are examined to test for consistency between the model results and observations. The simulations suggest the interactions between vertical eddy diffusion and background vertical advection play a significant role in the MSAO phenomenon. Further, the simulations imply there are rigid limits on vertical advection rates and eddy diffusion rates. For August at the Equator, 90 km altitude, the derived eddy diffusion rate is approximately 1 × 106 cm2 s−1 and the vertical advection is upwards at 0.8 cm s−1. For April the corresponding values are 4 × 105 cm2 s−1 and 0.1 cm s−1. These results from the current 1-D model simulations will need to be verified by a full 3-D simulation. Exactly how vertical advection and eddy diffusion are related to gravity wave momentum as discussed by Dunkerton (1982) three decades ago remains to be addressed.

scholarly journals Evolution characteristics and its driving forces analysis of vegetation ecological quality in Qinling Mountains region from 2000 to 2019

2021 ◽  
Vol 45 (6) ◽  
pp. 617-625
Author(s):  
Yu-He JI ◽  
Guang-Sheng ZHOU ◽  
Shu-Dong WANG ◽  
Li-Xia WANG ◽  
Meng-Zi ZHOU ◽  
...  
Keyword(s):  
Driving Forces ◽  
Ecological Quality ◽  
Qinling Mountains ◽  
Evolution Characteristics

scholarly journals Spatial Patterns and Driving Forces of Conflicts among the Three Land Management Red Lines in China: A Case Study of the Wuhan Urban Development Area

2019 ◽  
Vol 11 (7) ◽  
pp. 2025
Author(s):  
Yang Zhang ◽  
Yanfang Liu ◽  
Yan Zhang ◽  
Xuesong Kong ◽  
Ying Jing ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Urban Development ◽  
Spatial Patterns ◽  
Land Management ◽  
Driving Forces ◽  
Sustainable Urban Development ◽  
Construction Land ◽  
Urban Rural ◽  
Development Area

The delimitation of three land management red lines (LMRLs), which refers to urban growth boundaries (UGBs), ecological protection redlines (EPRs), and basic farmland protection zones (BFPZs), has been regarded as a control method for promoting sustainable urban development in China. However, in many Chinese cities, conflicts extensively exist among the three LMRLs in terms of spatial partitioning. This study clarifies the connotation of conflicts among the three LMRLs. Moreover, a red line conflict index (RLCI) is established to characterize the intensity of conflicts among the three LMRLs. The Wuhan Urban Development Area (WUDA) is used for a case study, in which the spatial patterns of the three types of conflicts among the three LMRLs (i.e., conflicts between EPRs and BFPZs, EPRs and UGBs, and UGBs and BFPZs) are analyzed through numerous spatial statistical analysis methods (including spatial autocorrelation, urban-rural gradient, and landscape pattern analyses). In addition, the driving forces of these conflicts are identified from the perspectives of natural physics, socioeconomic development, neighborhood, policy and planning using three binary logistic regression models. Results show that the conflicts between EPRs and BFPZs, EPRs and UGBs, and UGBs and BFPZs are mainly distributed on the edge of the WUDA, inside Wuhan’s third circulation line, and at the urban–rural transition zone, respectively. The patch of conflict between BFPZs and UGBs has the lowest aggregation degree, the highest fragmentation degree, and the most complex shape. Logistic regression results show that the combination and relative importance of driving factors vary in the three types of conflicts among the three LMRLs. In the conflict between EPRs and BFPZs, the distance to city centers is the most important influencing factor, followed by the proportion of ecological land and elevation. In the conflict between UGBs and EPRs, the proportion of construction land, the distance to city centers, and whether the land unit is within the scope of a restricted development zone are the three most important factors. The proportion of construction land, the distances to the Yangtze and Han Rivers, and the proportion of cultivated land significantly influence the conflict between UGBs and BFPZs. This study aids in our understanding of the causes and mechanisms of conflicts among the three LMRLs, and provides important information for the “integration of multi-planning” and land management in Wuhan and similar cities.

The development of urban mega-projects in China: A case study of Nantong’s metro project

2019 ◽  
pp. 239980831989458
Author(s):  
Shutian Zhou ◽  
Guofang Zhai ◽  
Yuwen Lu ◽  
Yijun Shi
Keyword(s):  
Driving Forces ◽  
Rapid Development ◽  
Urban Life ◽  
Transport Infrastructure ◽  
Whole Process ◽  
Policy Interventions ◽  
Emerging Issues ◽  
Development Objectives ◽  
Metro Project

Since there has been a huge amount of transport infrastructure projects being proposed, planned and constructed over the past decades in China, this article aims to reveal the substantial dynamics of China’s rapid development of urban mega-projects. It analyzes Nantong’s metro project to use it as a case study – how it was being justified, approved and implemented, and what were the key driving forces within the whole process through official justifications and key informant interview materials. The urban metro system is supposedly an approach to achieve urban development objectives, a tool for growth and a way to a better urban life. We find inter-city competition as an underlying driving force that initiates such urban mega-projects with certain weight given to economic indicators in project appraisals within a largely local government-led and public-invested process. Furthermore, domestic economic performance and changing policy interventions also exert significant influence on project approval and long-term project development. Our findings echo some Western literature on mega-projects development and urban competition, while revealing other features and emerging issues relating to project initiation, proposal examination and implementation specific to the Chinese context.

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