Pollen dispersal in a mountainous area based on pollen analysis of four natural trap types from Lugu Lake, southwest China

2013 ◽  
Vol 51 (4) ◽  
pp. 413-425 ◽  
Author(s):  
Su-Ping LI ◽  
Ya-Qin HU ◽  
David Kay FERGUSON ◽  
Jian-Xin YAO ◽  
Cheng-Sen LI
Keyword(s):  
Pollen Analysis ◽  
Southwest China ◽  
Pollen Dispersal ◽  
Mountainous Area ◽  
Lugu Lake ◽  
Natural Trap

Typical Portal Structure for Single Track High Speed Railway Tunnel in Rugged Mountainous Area with High and Abrupt Slope

2014 ◽  
Vol 716-717 ◽  
pp. 342-346
Author(s):  
Xiao Jun Zhou ◽  
Bo Jiang ◽  
Yue Feng Zhou ◽  
Yu Yu
Keyword(s):  
High Speed ◽  
Southwest China ◽  
Earth Pressure ◽  
Mountainous Area ◽  
Single Track ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Railway Line ◽  
Bridge Abutment

On the basis of different landform and multifarious topography in rugged mountainous area in southwest China, typical tunnel portals for single track tunnels in a new high speed railway line have been presented in the paper. The portal comprises headwall, shed tunnel, bridge abutment and its support. Portal with headwall is suitable for tunnel to resist front earth pressure on high and abrupt slope. Shed tunnel is placed in front of headwall so as to prevent rockfall; its outward part is built into a flared one. Meanwhile, the installation of bridge and its abutment are also included in the portal according to landform in the paper.

scholarly journals Understanding the Role of Urbanization on Vegetation Dynamics in Mountainous Areas of Southwest China: Mechanism, Spatiotemporal Pattern, and Policy Implications

2021 ◽  
Vol 10 (9) ◽  
pp. 590
Author(s):  
Li Peng ◽  
Wei Deng ◽  
Ying Liu
Keyword(s):  
Land Surface ◽  
Vegetation Dynamics ◽  
Southwest China ◽  
Policy Implications ◽  
Vegetation Coverage ◽  
Spatiotemporal Pattern ◽  
Mountainous Area ◽  
Mountainous Areas ◽  
Rapid Urbanization ◽  
The Relationship

As an important component of terrestrial ecosystems, the mountainous areas of southwest China are facing eco-environmental stress due to rapid urbanization. This study analyzed the vegetation dynamics during urbanization in 410 counties in the mountainous area of southwest China using trend analysis and bivariate spatial autocorrelation analysis. The results demonstrate the following: (1) The regional differences in the natural background and the stage of economic development resulted in obvious geographical heterogeneity in the relationship between urbanization and vegetation coverage. (2) The relationship between the rate of urbanization level change (RULC) and the slope of the normalized difference vegetation index (NDVI) (Slope−NDVI) in the mountainous areas of southwest China is characterized by an inverted-U-shaped curve. Based on the inflection point (0.206, 57.60) of the inverted-U-shaped curve, the optimal mean annual RULC is 1.37%. (3) The relief degree of the land surface, the gross domestic product (GDP) change rate, and the slope of temperature change are positively correlated with the Slope−NDVI. Overall, an understanding of how urbanization affects vegetation dynamics can inform decisions concerning ecological restoration and urban–rural development in China.

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