Dynamic Changes Of Landscape Ecological Risk In Shanshan County And Suggestions For Regulation And Control

Under the background of global climate change,greenhouse effect and rapid urban development on the ecological environment,it is of great significance for regional ecological environment construction to grasp the changes of ecological risks through multi-angle time series and spatial analysis of regional landscape patterns.Shanshan County has a typical arid continental climate.In recent years,the rapid economic development,coupled with a large number of land reclamation,unscientific farming and wasteland,deforestation and lack of awareness of ecological protection,has increased the ecology of Shanshan County Environmental instability.Therefore,this study is based on the land use data of the fifth phase of Shanshan County,using ArcGIS10.5 software to analyze its land use dynamic changes and ecological resilience,and using the software Fragstats 4.2 to discuss landscape pattern changes and the impact on ecological risk Carry out the landscape ecological risk assessment and driving force analysis of Shanshan County,and combine with the results of field investigation and driving force analysis to make adjustment suggestions.The analysis results are as follows:1.Land use changeThe land use area change in Shanshan County showed an upward trend in the early stage of the land use comprehensive index in the fifth period of data,and the later stage of land use improvement.In Shanshan County,when the proportion of areas with low contribution values decreases and the proportion of areas with high contribution values increases,the overall ecological value is in an increasing trend.The increase in the ecological flexibility of Shanshan County reflects the development of the ecological stability of the study area in a favorable direction.The simulation of the future change trend of Shanshan County shows that the area of unused land in Shanshan County is still decreasing,which is consistent with the judgment of the previous data.2.Changes in landscape patternThe overall fragmentation of landscape patches in the fifth phase of the data fluctuated in an "N" shape.The high evapotranspiration in Shanshan County caused the greatest loss of water area,but the increase in the number of plaques and the increase in the area of each plaque in the later period indicate that Shanshan County is improving the protection of water resources.The number of unused foundations is large,and the landscape loss index does not change significantly.The LPI data of construction land and forest land reflects the large area of plaque fluctuations in 2005.According to the survey,there is competition between local cultivated land and forest land.Most of the farmland is located near the water system,and the distribution is relatively concentrated and the rate of recultivation is relatively high.3.Landscape ecological riskThe overall ecological risk value of Shanshan County is decreasing,which is inextricably linked to the reduction of unused land area.The increase of grassland and water area in the study area can promote the reduction of risk value.The amount of change in the risk area is inversely proportional to the risk level.Based on the analysis of the CCA driving mechanism of the change of ecological risk in Shanshan County,with the increase of population,the change of annual precipitation,the increase of arable land area,and the change of landscape diversity in Shanshan County,it is an important driving force for ecological risk change.4.Ecological risk management recommendationshigh-risk,higher-risk,and medium-risk management should consider the impact of annual precipitation on water resources,and the relationship between vegetation area and landscape patch fragmentation.The two put forward different management suggestions according to the site environment.The former is to establish available water resources and increase the survival rate of vegetation,while the latter increases the utilization rate of water resources and expands the vegetation coverage area.Low-risk and low-risk management needs to consider the influence of human factors,optimize and integrate according to the spatial pattern and shape of cultivated land patches,and development can appropriately expand investment to increase continuity.