Rapid urbanization has resulted in an increase in urban carbon emissions, the degradation of the urban ecosystem, and the escalation of urban environmental issues. It was of utmost importance to define the equilibrium between the supply and demand of urban ecosystem services in light of the rising demand for these services. In karst multi-mountainous urban built-up areas, there were a large number of urban remnant mountains (URMs), which provided a variety of irreplaceable ecosystem services. In order to explore the effect of changes in landscape composition on carbon sequestration services, taking the built-up area of the Guiyang city center as the study area, the spatial-temporal evolution characteristics of the supply and demand of carbon sequestration services and differences in landscape composition within cells were analyzed through the CASA model, multi-source data fusion model, and Arc GIS spatial analysis. Results showed that: (1) From 2010 to 2020, the total carbon sequestration service supply and demand of the Guiyang built-up area showed a decreasing trend; (2) The overall supply and demand space of carbon sequestration services presented a transitional structure of “central city-periphery,” but some supply cells were embedded in the city in a scattered manner; (3) When the percentage of construction land in the cell reached 28.8%, the percentage of evergreen broadleaved forest and evergreen needle-leaved forest would be 30.9% and 4.6%, respectively, and the demand for carbon sequestration services would be generated in the cell. The results of this study could provide guidance for urban planners and policy makers to protect urban ecological security and promote sustainable urban development.
There are a large number of urban remnant mountains (URMs) in the built-up areas of karst mountainous cities, which are the main components of urban habitats and play a variety of irreplaceable ecosystem services functions such as maintaining local biodiversity. Based on InVEST model and Geographically Weighted Regression (GWR) model, this study quantitatively analyzed the spatial-temporal evolution characteristics of land use/land cover (LULC), landscape pattern and habitat quality (HQ), and explored the relationship between LULC and HQ in a typical karst mountainous city. Results showed: (1) From 2008 to 2018, LULC change in the study area was intense, with cultivated land and URMs being converted into construction land. Moreover, urban landscape fragmentation was serious and landscape patch spatial heterogeneity was high; (2) The overall level of HQ in the study area was low and the spatial aggregation characteristics were obvious. The high value area was mainly distributed in the area of large urban green space (UGS) and URMs, while the low value area was mainly concentrated in the area of construction land and traffic land;(3) GWR analysis showed that LULC was significantly correlated with HQ change, natural environment determined the overall distribution of HQ, human activities played a leading role in HQ change, and urbanization process had spatial heterogeneity on HQ change; (4) URMs iwas the main contributor of high level HQ, but its encroachment by construction land and the increase of surrounding building density make the quality of URMs habitat degraded obviously. It is urgent to strengthen the management of urban ecological environment and properly deal with the relationship between urban expansion and urban natural environment. This study is helpful to further understand the relationship between LULC and HQ evolution in karst mountainous cities, and is of great significance for urban biodiversity conservation, ecological security protection and high-quality urban development.
There are a large number of urban remnant mountains (URMs) in the built-up areas of karst mountainous cities, which are the main components of urban habitats and play a variety of irreplaceable ecosystem services functions such as maintaining local biodiversity. Based on InVEST model and geographically weighted regression (GWR), this study explored the relationship between land use/land cover (LULC) and habitat quality (HQ) evolution in a typical karst mountainous city. The results showed that: (1) the LULC change in the study area was intense from 2008 to 2018, with cultivated land and URMs transformed into construction land, and the urban landscape fragmentation was serious. (2) The overall level of HQ in the study area was low. The high value area was mainly distributed in the area where large urban green space (UGS) and URMs were located, while the low value area was mainly concentrated in the construction land gathering area. (3) GWR analysis showed that there was a significant correlation between LULC change and HQ change, natural environment determined the overall distribution of HQ, and human activities played a leading role in HQ change. (4) URMs was the main contributor of high level HQ, but its encroachment by construction land and the increase of surrounding building density make the quality of URMs habitat degraded obviously. This study is of great significance for urban biodiversity conservation and urban high-quality development.
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