Ecological Cumulative Effects In Central Yunnan Based On RS And GIS

The harmonious coexistence between man and nature has always been a development hotspot in today’s society.How to take into account the ecological environment protection while developing economy has become an urgent problem to be solved.In the study of the impact of human activities on the ecological environment,a variety of evaluation models have been constructed at home and abroad,and different impact factors have been selected for research.However,the mechanism of ecological environment change is complex,the impact factors are numerous,the evaluation is difficult,and there are few quantitative studies on the process change.Therefore,through the characterization model based on the ecological cumulative effect index,the comprehensive ecological cumulative index was constructed by the ecosystem function deviation cumulative index,landscape structure disturbance cumulative index,ecological risk cumulative index,vegetation degradation cumulative index,and water ecological cumulative index,and the spatial and temporal analysis of regional ecological environment and ecological cumulative change in central Yunnan from 1990 to 2020 was carried out.The driving force is analyzed from two aspects: natural factors(altitude,slope,vegetation coverage)and social and economic factors(population density,gross national product,urbanization rate,road expansion degree).The results show that:(1)Construction of comprehensive ecological accumulation index modelOn the basis of the ecological cumulative effect representation model,the cumulative index of ecosystem function deviation,landscape structure disturbance and vegetation degradation was adopted.At the same time,the ecological risk cumulative index and water ecological cumulative index were added to construct the comprehensive ecological cumulative effect index considering the stability of the ecological environment and the comprehensive ecological environmental quality changes.The change process of eco-environmental quality in the central Yunnan region from 1990 to 2020 was quantitatively analyzed,and good results were obtained.(2)Spatio-temporal analysis of comprehensive ecological cumulative effect in central Yunnan from 1990 to 2020The comprehensive ecological cumulative effect index in central Yunnan was constructed by different types of ecological cumulative index,and the changes of ecological environment quality in central Yunnan during 1990-2020 were analyzed in time and space.The research conclusions are as follows: The ecological cumulative effect has a complex formation mechanism,so it has a periodic change in time,but no specific change trend in spatial distribution.However,the overall ecological cumulative effect shows the trend of reverse accumulation in the short term and positive accumulation in the long term.From 1990 to 2020,the ecological cumulative effect in central Yunnan showed positive accumulation and the ecological environment improved somewhat.However,Yuxi and Chuxiong were in reverse accumulation in several periods due to their good ecological basement,while Kunming and Qujing were in positive accumulation in several periods due to their poor ecological basement.(3)Driving forces of comprehensive ecological cumulative effect in central Yunnan from 1990 to 2020The driving force analysis of ecological cumulative effect was carried out through natural factors and socio-economic factors,and the research conclusions are as follows:Population density,GDP,urbanization rate,road expansion degree and ecological cumulative effect are positively correlated,and the correlation of road expansion degree is higher than other socio-economic factors.The temporal and spatial correlation of social factors developed from the central region of Yunnan to the peripheral region.The results showed that,with the rapid development of social economy,the influence of the high-development region on the ecological cumulative effect was less than that of the low-development region.Altitude,slope and vegetation coverage are negatively correlated with ecological cumulative effect.With the increase of altitude,slope and vegetation coverage,the reverse cumulative effect weakens and the positive cumulative effect increases.However,the effect is relatively small in high altitude,large slope and high coverage area.