scholarly journals Spatio-Temporal Dynamics of Landscape Connectivity and Ecological Network Construction in Long Yangxia Basin at the Upper Yellow River

Land ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 265 ◽  
Author(s):  
Fangning Shi ◽  
Shiliang Liu ◽  
Yi An ◽  
Yongxiu Sun ◽  
Shuang Zhao ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Yellow River ◽  
Landscape Connectivity ◽  
Natural Habitat ◽  
Cultivated Land ◽  
Landscape Resistance ◽  
Ecological Network ◽  
Natural Habitats ◽  
Yellow River Valley ◽  
Upper Yellow River

Analyzing multi-scale changes in landscape connectivity is an important way to study landscape ecological processes and also an important method to maintain regional biodiversity. In this study, graph-based connectivity was used to analyze the dynamics of the connectivity of natural habitats in the Long Yangxia basin of upper Yellow River valley from 1995 to 2015. We used the core areas of the nature reserves as the source regions to construct ecological networks under different thresholds, so as to identify key areas that can maintain overall landscape connectivity. The results showed that, from 1995 to 2015, the landscape connectivity in the study area increased for the first 10 years, and, since 2005, has declined. On a spatial scale, we found that both the connectivity of the ecological network and the length of the corridor increased with landscape resistance. Our analysis demonstrates the importance of the natural habitat in the southern part of the study area where connectivity was higher, as well as the sensitivity of connectivity of the northern area to human activities. Both large and medium patches contribute greatly to the overall landscape connectivity, while attention needs to be paid to the protection and management of small patches as they played “stepping stone” roles in maintaining and improving landscape connectivity. The proportions of landscape types that served as corridors, listed in order of their contribution to connectivity, were grassland, forestland, wetland and cultivated land. This suggests that, in addition to focusing on the protection of grassland and forest land, the reasonable planning and utilization of wetland and cultivated land will also have an impact on landscape connectivity. In addition, the protection of and improvement in habitats in the Sanjiangyuan Nature Reserve is of great significance to enhance landscape connectivity. Our study provides a scientific basis to support and improve regional landscape connectivity and biodiversity conservation over the next decade.

Ecological network construction of the heterogeneous agro-pastoral areas in the upper Yellow River basin

2020 ◽  
Vol 302 ◽  
pp. 107069 ◽  
Author(s):  
Fangning Shi ◽  
Shiliang Liu ◽  
Yongxiu Sun ◽  
Yi An ◽  
Shuang Zhao ◽  
...  
Keyword(s):  
River Basin ◽  
Yellow River ◽  
Yellow River Basin ◽  
Ecological Network ◽  
Network Construction ◽  
Upper Yellow River

scholarly journals Identifying Ecological Corridors and Networks in Mountainous Areas

2021 ◽  
Vol 18 (9) ◽  
pp. 4797
Author(s):  
Di Zhou ◽  
Wei Song
Keyword(s):  
Landscape Connectivity ◽  
Effective Means ◽  
Ecological Networks ◽  
Habitat Destruction ◽  
Spatial Pattern Analysis ◽  
Cultivated Land ◽  
Ecological Network ◽  
Network Efficiency ◽  
Mountain Areas ◽  
Ecological Corridors

Since the 1950s, human activities have been driving economic development and land changes, hindering the conservation of biological habitats and landscape connectivity. Constructing ecological networks is an effective means to avoid habitat destruction and fragmentation. Mountain areas are hotspots of biological habitats and biodiversity; however, the pace of urbanization in mountain areas is also accelerating. To protect an ecosystem more effectively, it is necessary to identify ecological corridors and ecological networks. Therefore, based on the Minimal Cumulative Resistance model and taking Chongqing in China as an example, the identification of potential ecological corridors and the construction of an ecological network in Chongqing were realized using the Linkage Mapper software. The results were as follows: (1) From 2005 to 2015, the patch area of cultivated land and grassland in Chongqing decreased by 0.08% and 1.46%, respectively, while that of built-up areas increased by 1.5%. The fragmentation degree of cultivated land was higher, and the internal connectivity of forestry areas was worse. (2) In total, 24 ecological sources were selected, and 87 potential ecological corridors and 35 ecological nodes were generated using the Morphological Spatial Pattern Analysis and the Conefor2.6 software. The total length of the ecological network in Chongqing is 2524.34 km, with an average corridor length of 29.02 km. (3) The overall complexity and network efficiency are high, but the spatial distribution of ecological corridors is uneven, especially in the southwest of Chongqing.

Prehistoric human activity and its environmental background in Lake Donggi Cona basin, northeastern Tibetan Plateau

The Holocene ◽  
2020 ◽  
Vol 30 (5) ◽  
pp. 657-671 ◽  
Author(s):  
Jingyi Gao ◽  
Guangliang Hou ◽  
Haicheng Wei ◽  
Youcheng Chen ◽  
Chongyi E ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Tibetan Plateau ◽  
Yellow River ◽  
River Valley ◽  
Osl Dating ◽  
Lower Altitude ◽  
Stone Artifacts ◽  
Yellow River Valley ◽  
Upper Yellow River ◽  
The Impact

Lake Donggi Cona is a key area for the exploration of the prehistoric settlement of the inner Tibetan Plateau because of its location in the joint of the higher inner Tibetan Plateau and the upper Yellow River valley. Here, we carried out archeological investigation on the lake basin, and a total of 256 pieces of stone artifacts were collected from the surface of the DJCN 3-2-2 site on the northern shore terraces of the lake. In addition, AMS14C and OSL dating were performed on hearths and section (DJCN 3-2-2), respectively; meanwhile environmental proxies, including grain size, charcoal, magnetic susceptibility, fungal spore, and pollen, were analyzed. The results indicate that the AMS14C ages of the charcoal range between ~5.4 and 5.0 cal. ka BP, consistent with OSL dating from the charcoal layers in the DJCN 3-2-2 section (~5.5 ka BP). The functional analysis of the stone artifacts and dating results showed that the site was a seasonal, relative long-term, and central camp which was used for processing of stone artifacts, cutting and consuming food and the production of daily necessities. Charcoal, magnetic susceptibility, and fungal spores from the DJCN 3-2-2 section revealed that prehistoric human activities began at ~5.8 ka BP and significantly intensified during the period of ~5.6–5.5 ka BP and then gradually weakened. Pollen assemblages indicated that the vegetation was dominated by alpine steppe during the period of ~5.8–5.0 ka BP, indicative of a relatively warmer and wetter climatic condition during this period. Taken together, we infer that under the impact of the Neolithic culture in lower altitude of upper Yellow River valley and Microlithic culture in the higher altitude inner Plateau, a Neolithic-Zongri culture had emerged in the transitional region between these two cultures during middle Holocene.

A luminescence dating study of the sediment stratigraphy of the Lajia Ruins in the upper Yellow River valley, China

2014 ◽  
Vol 87 ◽  
pp. 157-164 ◽  
Author(s):  
Yuzhu Zhang ◽  
Chun Chang Huang ◽  
Jiangli Pang ◽  
Yali Zhou ◽  
Xiaochun Zha ◽  
...  
Keyword(s):  
Yellow River ◽  
River Valley ◽  
Luminescence Dating ◽  
Yellow River Valley ◽  
Sediment Stratigraphy ◽  
Upper Yellow River
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