scholarly journals Decreased Landscape Ecological Security of Peri-Urban Cultivated Land Following Rapid Urbanization: An Impediment to Sustainable Agriculture

2018 ◽  
Vol 10 (2) ◽  
pp. 394 ◽  
Author(s):  
Dan Yu ◽  
Dongyan Wang ◽  
Wenbo Li ◽  
Shuhan Liu ◽  
Yuanli Zhu ◽  
...  
Keyword(s):  
Sustainable Agriculture ◽  
Ecological Security ◽  
Cultivated Land ◽  
Rapid Urbanization ◽  
Landscape Ecological ◽  
Landscape Ecological Security

Cultivated land landscape ecological security: Influencing factors and spatial differences in the hilly region of South China

2019 ◽  
Vol 39 (17) ◽  
Author(s):  
韩逸 HAN Yi ◽  
郭熙 GUO Xi ◽  
江叶枫 JIANG Yefeng ◽  
饶磊 RAO Lei ◽  
孙凯 SUN Kai ◽  
...  
Keyword(s):  
Influencing Factors ◽  
South China ◽  
Ecological Security ◽  
Cultivated Land ◽  
Hilly Region ◽  
Spatial Differences ◽  
Landscape Ecological ◽  
Landscape Ecological Security

scholarly journals Landscape change patterns at three stages of the construction and operation of the TGP

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruikang Li ◽  
Yangbing Li ◽  
Bo Li ◽  
Dianji Fu
Keyword(s):  
Landscape Pattern ◽  
Landscape Change ◽  
Ecological Security ◽  
Three Gorges ◽  
Temporal Characteristics ◽  
Landscape Type ◽  
The Three Gorges ◽  
Landscape Types ◽  
Landscape Ecological ◽  
Landscape Ecological Security

AbstractAnalyses of landscape change patterns that are based on elevation and slope can not only provide reasonable interpretations of landscape patterns but can also help to reveal evolutionary laws. However, landscape change patterns and their model in different landforms of the typical watershed in the Three Gorges Reservoir Area (TGRA) has not been quantified and assessed effectively. As a complex geographical unit, the ecological environment in the middle reach of the Yangtze River has experienced great changes due to the construction of the Three Gorges Project (TGP) and its associated human activities. Here, based mainly on a digital elevation model (DEM) and remotely sensed images from 1986, 2000, 2010, and 2017 and by using GIS technology, speeds/ trends of landscape change, the index of landscape type change intensity, landscape pattern indices, and landscape ecological security index, the spatial and temporal evolution characteristics of different elevations, slopes, and buffer landscape types were analyzed in typical watersheds, as well as an evolutionary model of the landscape pattern. The results indicated that (1) the landscape types along with the land classification and buffer zone that were influenced by the TGR construction have undergone a phased change, with the period 2000–2010 being the most dramatic period of landscape evolution during the impoundment period; (2) landscape type shifts from human-dominated farmland to nature-driven forestland and shrub-land as elevations, slopes and buffer distances increased. The landscape has shifted from diversity to relative homogeneity; (3) land types and buffer zones played essential roles in the landscape pattern index, which is reflected in the differences in landscape type indices for spatial extension and temporal characteristics. The results of this paper illustrate the spatial–temporal characteristics of various landscape types at three distinct stages in the construction of the TGR. These findings indicate that the landscape ecological security of the watershed is improving year by year. The follow-up development of the TGRA needs to consider the landscape change patterns of different landforms.

Spatial-temporal differentiation and pattern optimization of landscape ecological security in the Ugan-Kuqa river oasis

2019 ◽  
Vol 39 (15) ◽  
Author(s):  
何珍珍 HE Zhenzhen ◽  
王宏卫 WANG Hongwei ◽  
杨胜天 YANG Shengtian ◽  
方斌 FANG Bin ◽  
张兆勇 ZHANG Zhaoyong ◽  
...  
Keyword(s):  
Ecological Security ◽  
Temporal Differentiation ◽  
Landscape Ecological ◽  
Landscape Ecological Security
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