Study of the Temporal and Spatial Changes of Landscape Pattern in Chuxiong Prefecture in the Past 20 Years

2022 ◽  
Vol 10 (01) ◽  
pp. 33-44
Author(s):  
璐 阎
Keyword(s):  
Landscape Pattern ◽  
The Past ◽  
Spatial Changes ◽  
Temporal And Spatial

scholarly journals Temporal and spatial changes of maize yield potentials and yield gaps in the past three decades in China

2015 ◽  
Vol 208 ◽  
pp. 12-20 ◽  
Author(s):  
Fulu Tao ◽  
Shuai Zhang ◽  
Zhao Zhang ◽  
Reimund P. Rötter
Keyword(s):  
Maize Yield ◽  
The Past ◽  
Spatial Changes ◽  
Yield Gaps ◽  
Temporal And Spatial

scholarly journals Remote Sensing Based Spatial-Temporal Monitoring of the Changes in Coastline Mangrove Forests in China over the Last 40 Years

2021 ◽  
Vol 13 (10) ◽  
pp. 1986
Author(s):  
Junyao Zhang ◽  
Xiaomei Yang ◽  
Zhihua Wang ◽  
Tao Zhang ◽  
Xiaoliang Liu
Keyword(s):  
Remote Sensing ◽  
Landscape Pattern ◽  
Remote Sensing Data ◽  
Distribution Area ◽  
Mangrove Forests ◽  
Landscape Index ◽  
National Scale ◽  
Spatial Changes ◽  
Temporal And Spatial ◽  
Degree Of Fragmentation

As a developing country, China’s mangrove landscape pattern has undergone significant temporal and spatial changes over the last four decades. However, we know little about the changes in the mangrove landscape pattern characteristics other than the area at the national scale. The analysis of mangrove landscape pattern changes from different perspectives on a national scale can provide scientific support for mangrove protection and restoration. In this study, the temporal and spatial changes in the pattern of the mangrove landscape over the last 40 years in China were analyzed based on remote sensing data with high classification accuracy (99.3% of 2018). First, according to the natural geographical conditions of the coastal zone and the distribution of the mangroves, the distribution area of the mangroves in China was divided into 31 natural shores. Then, by selecting representative landscape indexes and constructing an integrated landscape index, the spatial-temporal changes in the landscape pattern of China’s mangroves over the last 40 years were analyzed based on five perspectives: Total area change, shape complexity, connectivity, fragmentation, and the integrated state of the landscape. From a temporal viewpoint, before 2000, the total area of each shore exhibited a downward trend, and the degree of connectivity deteriorated continuously, but the degree of fragmentation was stable at a low level. After 2000, although the total area improved, the degree of fragmentation gradually increased. The spatial changes are mainly reflected by the fact that the shores in Guangdong and Hainan exhibited significant differences within the same province. Based on the above analysis, corresponding scientific suggestions are proposed from temporal and spatial viewpoints to provide guidance for mangrove management and protection in China and to provide a reference for mangrove research in other regions of the world.

Temporal and spatial changes of blue water and green water in the Taihang Mountain Region, China, in the past 60 years

2019 ◽  
Vol 64 (16) ◽  
pp. 2040-2056 ◽  
Author(s):  
Junkai Du ◽  
Yangwen Jia ◽  
Chunfeng Hao ◽  
Yaqin Qiu ◽  
Cunwen Niu ◽  
...  
Keyword(s):  
Mountain Region ◽  
Green Water ◽  
Blue Water ◽  
The Past ◽  
Spatial Changes ◽  
Temporal And Spatial ◽  
Taihang Mountain

Changes in Wetland Landscape Pattern and Its Driving Forces of Binhai New Area of Tianjin City in the Past Three Decades

2010 ◽  
Vol 12 (3) ◽  
pp. 436-443 ◽  
Author(s):  
Weiqing MENG ◽  
Hongyuan LI ◽  
Cui HAO ◽  
Xunqiang MO
Keyword(s):  
Landscape Pattern ◽  
Driving Forces ◽  
Wetland Landscape ◽  
The Past ◽  
Tianjin City

scholarly journals Temporal and spatial changes in wall shear stress during atherosclerotic plaque progression in mice

2018 ◽  
Vol 5 (3) ◽  
pp. 171447 ◽  
Author(s):  
R. Xing ◽  
A. M. Moerman ◽  
Y. Ridwan ◽  
M. J. Daemen ◽  
A. F. W. van der Steen ◽  
...  
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Mouse Model ◽  
Atherosclerotic Plaque ◽  
Proximal Part ◽  
Plaque Progression ◽  
Plaque Composition ◽  
Spatial Changes ◽  
Temporal And Spatial ◽  
Wall Shear

Wall shear stress (WSS) is involved in atherosclerotic plaque initiation, yet its role in plaque progression remains unclear. We aimed to study (i) the temporal and spatial changes in WSS over a growing plaque and (ii) the correlation between WSS and plaque composition, using animal-specific data in an atherosclerotic mouse model. Tapered casts were placed around the right common carotid arteries (RCCA) of ApoE −/− mice. At 5, 7 and 9 weeks after cast placement, RCCA geometry was reconstructed using contrast-enhanced micro-CT. Lumen narrowing was observed in all mice, indicating the progression of a lumen intruding plaque. Next, we determined the flow rate in the RCCA of each mouse using Doppler Ultrasound and computed WSS at all time points. Over time, as the plaque developed and further intruded into the lumen, absolute WSS significantly decreased. Finally at week 9, plaque composition was histologically characterized. The proximal part of the plaque was small and eccentric, exposed to relatively lower WSS. Close to the cast a larger and concentric plaque was present, exposed to relatively higher WSS. Lower WSS was significantly correlated to the accumulation of macrophages in the eccentric plaque. When pooling data of all animals, correlation between WSS and plaque composition was weak and no longer statistically significant. In conclusion, our data showed that in our mouse model absolute WSS strikingly decreased during disease progression, which was significantly correlated to plaque area and macrophage content. Besides, our study demonstrates the necessity to analyse individual animals and plaques when studying correlations between WSS and plaque composition.

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