scholarly journals Identify Ecological Corridors and Build Potential Ecological Networks in Response to Recent Land Cover Changes in Xinjiang, China

2020 ◽  
Vol 12 (21) ◽  
pp. 8960
Author(s):  
Yanjie Zhang ◽  
Wei Song
Keyword(s):  
Land Cover ◽  
Landscape Connectivity ◽  
Minimum Cost ◽  
Ecological Networks ◽  
Simulation Software ◽  
Land Cover Changes ◽  
Taklimakan Desert ◽  
Ecological Corridors ◽  
Dense Distribution ◽  
Year 2000

Using Linkage Mapper corridor simulation software, which is based on minimum cost distance, we identify ecological corridors and build potential ecological networks in response to recent land cover changes in Xinjiang, China. Based on the analysis of land use/cover changes, the change of landscape pattern index is also calculated. The results show that: (1) During the year 2000–2015, cultivated land and built-up areas of Xinjiang showed an increasing trend. Due to urbanization, Xinjiang’s landscape connectivity is getting worse, and the landscape is becoming more and more fragmented and isolated. (2) We have constructed 296 ecological corridors, with a total length of 2.71 × 104 km and an average corridor length of 90.98 km. A total of 145 ecological source patches and 500 ecological nodes were connected by 296 ecological corridors. (3) The ecological corridor of Xinjiang presents the characteristics of “dense-north and sparse-south” in space. The areas with dense distribution of ecological corridors mainly include Urumqi, Changji, Turpan, Tacheng, Kizilsu Kirgiz, Karamay, and Yining, and the Taklimakan desert fringe. The sparse distribution is mainly in the whole Taklimakan desert.

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.

scholarly journals A Validation Procedure for Landscape Connectivity Approaches: Evaluation of The Accuracy of Ecological Corridor Locations.

2021 ◽  
Author(s):  
Etienne Lalechère ◽  
Laurent Bergès
Keyword(s):  
Land Cover ◽  
Landscape Connectivity ◽  
Bird Species ◽  
Rural Landscape ◽  
Resistance Distance ◽  
Ecological Corridors ◽  
Ecological Corridor ◽  
Presence Data ◽  
Wide Range ◽  
Validation Procedure

Abstract ContextConnectivity conservation analysis is based on a wide range of approaches designed to locate key ecological corridors in order to maintain multispecies flows. However, the lack of validation procedures with accessible data prevents from selecting the most accurate approach.ObjectivesWe propose a new validation procedure to evaluate the accuracy of ecological corridor locations in landscape connectivity approaches. We applied this procedure to compare three modelling approaches and select the most accurate. MethodsOur procedure validates ecological corridor tracks with independent presence-only data, under the hypothesis that species should be present within or near the corridors (according to resistance distance) if the corridors have been correctly modelled. We applied Maxent and circuit theory to locate ecological corridors for forest bird species in a rural landscape following three approaches based on land cover, umbrella species and multispecies presence data. We compared the proportion of overlaid corridors among the three approaches, and selected the most accurate one according to our validation index.ResultsThe corridors modelled from species presence data (umbrella and multispecies approaches) were more consistent than the habitat-based (land cover) approach. The multispecies approach was the most accurate while habitat approach was the least accurate in locating ecological corridors.ConclusionsOur procedure can be used to: (1) evaluate the accuracy of the location of ecological corridors, (2) select the best approach to locate ecological corridors, and (3) validate the underlying assumptions of landscape connectivity approaches (e.g. dispersal and matrix resistance values).

A multi-species approach for assessing the impact of land-cover changes on landscape connectivity

2017 ◽  
Vol 32 (9) ◽  
pp. 1819-1835 ◽  
Author(s):  
Yohan Sahraoui ◽  
Jean-Christophe Foltête ◽  
Céline Clauzel
Keyword(s):  
Land Cover ◽  
Landscape Connectivity ◽  
Land Cover Changes ◽  
The Impact

scholarly journals A Validation Procedure for Ecological Corridor Locations

Land ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1320
Author(s):  
Etienne Lalechère ◽  
Laurent Bergès
Keyword(s):  
Land Cover ◽  
Landscape Connectivity ◽  
Bird Species ◽  
Calibration Data ◽  
Ecological Corridors ◽  
Maxent Model ◽  
Ecological Corridor ◽  
Presence Data ◽  
Wide Range ◽  
Validation Procedure

Connectivity conservation analysis is based on a wide range of approaches designed to pinpoint key ecological corridors in order to maintain multispecies flows. However, the lack of validation procedures with accessible data prevents one from evaluating the accuracy of ecological corridor locations. We propose a new validation procedure to evaluate the accuracy of ecological corridor locations in landscape connectivity approaches. The ability of the procedure to properly rank the accuracy of different landscape connectivity approaches was illustrated in a study case. Maxent model and circuit theory were used to locate ecological corridors for forest bird species, following three approaches based on land cover, umbrella species and multispecies presence data. The validation procedure was used to compare the three approaches. Our validation procedure ranked the three approaches as expected, considering that accuracy in locating ecological corridors is related to the biological realism of calibration data. The corridors modelled were more accurate with species presence data (umbrella and multispecies approaches) compared to land cover proxy (habitat-based approach). These results confirm the quality of the validation procedure. Our validation procedure can be used to: (1) evaluate the accuracy of the location of ecological corridors; (2) select the best approach to locate ecological corridors, and (3) validate the underlying assumptions of landscape connectivity approaches (e.g., dispersal and matrix resistance values).

scholarly journals Impact of Human Settlement on Land Use/Land Cover Changes in the Middle River Njoro Sub Watershed in Kenya

2018 ◽  
Vol 3 (4) ◽  
pp. 180
Author(s):  
Zachary Gichuru Mainuri
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Land Cover ◽  
Land Cover Changes ◽  
Land Use Land Cover ◽  
Human Settlement ◽  
Human Needs ◽  
Erdas Imagine ◽  
Remote Sensing Image Processing ◽  
Year 2000

This study investigated the use of remote sensing and GIS in evaluating the impacts of human settlement on land use /Land cover changes. The study also investigated the drivers behind the change in the middle of River Njoro sub watershed for a period of 27 years. Drivers of land use change were captured by the use of DPSIR model where Drivers (D) represented human needs, Pressures (P), human activities, State (S), the ecosystem, Impact (I) services from the ecosystem and Response (R), the decisions taken by land users. Land sat MSS and Land sat ETM+ (path 185, row 31) were used in this study. The Land sat ETM+ image (June 1987, May, 2000 and July, 2014) was downloaded from USGS Earth Resources Observation Systems data website. Remote sensing image processing was performed by using ERDAS Imagine 9.1. Three land use/land cover (LULC) classes were established as Human settlement, forest and shrub land. Severe land cover changes was found to have occurred from 1987-2000, where human settlement increased by 52%, shrub land reduced by 19%, and forestry reduced by 72%. In the year 2000 – 2014, human settlement increased by 121%, shrub land reduced by 45%, and forestry reduced by 64%. Forestry and shrub land were found to be consistently reducing while human settlement was increasing. It was evident from the images that the LULC changes with corresponding soil quality deterioration mostly occurred in the upper and middle parts of the Middle river Njoro sub watershed which were initially under forest. To minimize the risk of vegetation destruction and soil degradation, it will be necessary to identify socioeconomic safety nets and initiate restoration of the environment to original pre- catastrophe status.

The impacts of land use/land cover changes on the supply-demand budget of urban ecosystem services

2021 ◽  
Vol 14 (14) ◽  
Author(s):  
Syed Atif Bokhari ◽  
Zafeer Saqib ◽  
Amjad Ali ◽  
Arif Mahmud ◽  
Nadia Akhtar ◽  
...  
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Land Cover ◽  
Urban Ecosystem ◽  
Land Cover Changes ◽  
Land Use Land Cover ◽  
Urban Ecosystem Services
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