Ecological Security Assessment Based On Resource Flow And Ecological Carrier And Pattern Construction

Ecological security is an important guarantee for the sustainable development of economy and society,and a major task to promote the modernization of national governance system and governance capacity.Evaluation system is an important prerequisite to grasp the state of ecological security,and pattern planning is an important means to promote the implementation of ecological security.The current research on ecological security assessment lacks the research on the state of ecological carrier and the analysis of the interaction between human activities and ecological environment,which can not accurately judge the regional ecological security state and carry out the corresponding ecological security pattern optimization construction.This paper takes Linxiang City as an example,combined with the macro data,and uses the improved ecological footprint method to evaluate the security of resource flow.And on this basis,through the construction of ecological carrier security evaluation system,carry out regional ecological carrier security state research,comprehensive ecological security evaluation results.According to the evaluation results,the mean change point method and invest model are used to analyze the composition of micro physical geographical elements and the impact of human activities,and the results of spatial visualization are obtained to explore the reasons for the formation of its security state.According to the cause analysis,combined with the MCR model in landscape ecology,the spatial pattern optimization was further carried out,so as to improve and enhance the regional ecological security status.The results show that:(1)Linxiang city is in a safe state in terms of resource flow from 2005 to 2017.The security level of the whole ecological carrier is from grade IV to grade Ⅱ`.The state of the ecological carrier has experienced a fluctuating process of stable rise and degradation.The state of the whole regional ecological carrier is safe,but the cultivated land and water area are degraded.(2)Under the influence of human activities,33.94% of the total area of Linxiang city was in the area with the evaluation index lower than 0.8.From the perspective of land types,the cultivated land in some regions is highly unstable,and the cultivated land with evaluation index greater than0.8 only accounts for 14.54% of the total cultivated land in the study area.(3)The spatial distribution of ecological pattern shows "cluster" distribution,so it is necessary to construct ecological corridor to ensure the connectivity between "clusters" of regional ecological source areas.At the same time,there are conflict areas between socio-economic pattern and ecological pattern.The results of resource flow research show that there is still space for Linxiang city.The research on Ecological carrier shows that it is in a state of pressure,and the utilization of ecological carrier is unreasonable,so it needs to be adjusted to maintain its stability.The conclusion is that Linxiang city is in critical safety state.The relatively developed traffic corridor formed by human activities promotes the development of social economy,but also cuts the natural geographical elements to form a more advantageous area,which leads to the instability of ecological carrier.The obstacles of social economic corridor in the ecological pattern should be made to reserve the passageway connecting the ecological source in space,and the development edge of the social and economic source should be set up boundary,ensure the integrity of the core ecological source,so as to stabilize the regional ecological security state.