| Ecosystem is the material basis for human,and its stability and integrity are an important manifestation of ecological security and ecological health.However,rapid urbanization and unreasonable land use methods have caused conflicts between humans and land and the negative effects of the ecological environment.Ecological problems continue to emerge.Therefore,research on landscape ecological quality is helpful to promote regional ecological protection and the transformation of ecological benefits into economic benefits.Yulin is located in the transitional area between the Loess Plateau and the Mu Us Desert.It is a typical arid and semi-arid farming and pastoral zone.There are frequent droughts,soil erosion and land desertification in this area.At the same time,as an important energy and chemical base in my country,human disturbance activities have gradually increased.Both natural and human factors have made the ecological environment of Yulin show strong volatility and fragility.Research on the landscape ecological quality in Yulin will help optimize the regional ecological environment and promote the rational allocation and utilization of land resources.At the same time,it can guide and promote ecological protection and restoration projects in the mining area to improve the current ecological environment in Yulin and prevent the landscape ecological environment.Deteriorating and proposing scientific landscape planning schemes to provide meaningful reference.The remote sensing images in 2000,2005,2010,2015 and 2018 of Yulin were interpreted to process landscape thematic by the software ERDAS and Arc GIS10.The study area was divided into 527 plots,Fragstats was used to calculate the landscape index of each plot,combined with the Kriging to reveal the spatial and temporal distribution characteristics of landscape ecological quality in Yulin area.The landscape ecological quality model has been established.The results showed that:(1)the construction interference increased firstly and then decreased,NDVI showed an obvious upward trend,and the sensitivity increased slightly,landscape fragmentation decreased somewhat,land use structure decreased first and then increased,and SHDI showed a trend of first increase and then decrease.(2)From 2000 to 2018,the landscape stability of Yulin became higher and higher,and the areas with higher spatial stability spread from north to south;the degree of landscape disturbance first decreased,then surged,and then decreased again,showing an overall upward trend.The east to west interference level drops.(3)The overall landscape ecological quality has improved.In terms of space,the ecological quality of landscape is affected by the distribution of landforms.The ecological quality of landscape in sandy area is higher than loess gully area,and the landscape ecological quality in areas with developed economy,large population or large distribution of mineral resources is relatively low.The landscape ecological quality of each level is transformed into each other,showing a trend from low-level to high-level,and the quality areas of each level are transformed into high-quality areas.Analyzing the spatial correlation of landscape ecological quality,it is found that there is a positive correlation,and the aggregation characteristics are mainly "high-high". |
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