Evolution of resilience in the ecological network across arid inland river basins and its improvement strategies:A case study of Shiyang River Basin
The ecological and environmental problems such as water scarcity and intensified de-sertification greatly affect the ecological security and sustainable development of arid inland river basins.Scientific analysis and evaluation of the resilience level of ecological networks un-der external disturbances are of great significance for proposing targeted optimization plans for this type of river basin ecological network and enhancing its ecological stability.Based on the theory of complex adaptive systems,this paper constructs a comprehensive evaluation index system of ecological network resilience covering three dimensions:elements,structure and function.Taking the Shiyang River Basin as an example,the paper measures the resilience level of the ecological network in arid inland river basins and analyzes its spatiotemporal evolution characteristics and spatial differentiation patterns.The results show that:(1)The spatial struc-ture of the ecological network in the study area is unbalanced,with uneven aggregation of eco-logical"source-corridor-node",but the pattern of dense areas in the south and sparse areas in the north is essentially stable.(2)In 2000-2020,the resilience level of the ecological network increased overall,with an annual rate of 1.55%.The resilience of the ecological network in des-ert and mountainous areas increased faster than that in oasis areas,and the structural resilience improved faster than that of functional resilience and factor resilience.(3)During 2000-2020,the differences in the resilience level of ecological networks in types of mountains,oases and deserts gradually decreased.The proportions of"low-low"agglomeration(LL)and"high-high"agglomeration(HH)were high.LL agglomeration was mainly distributed in the northern desert area,while HH agglomeration was mainly distributed in the southern mountainous area,and both of them had a spatial diffusion trend.Finally,in view of the characteristics of mountains,oases and deserts,this paper proposes strategies to improve the resilience of the basin in the context of ecological restoration from three aspects:elements,structure and function.
ecological network resiliencecomplex adaptive systems theorymountain-oasis-desertShiyang River Basin