The spatiotemporal characteristics of ecological risks of land use change in Sanjiangyuan National Park over the past 30 years
Aiming to effectively evaluate the potential risk of external disturbance to the ecological environment in protected areas,ensuring the sustainable use of natural resources and ecological balance,taking the Sanjiangyuan National Park as a case study,landscape metrics was used to construct an ecological risk model,combined with geostatistical analysis and transfer matrix methods to explore the spatial and temporal characteristics of ecological risks in this paper.The results showed that the land landscape of the Sanjiangyuan National Park exhibited a change characterized by a decrease in patchiness and an increase in dominance.Specifically,the patchiness of grassland landscapes decreased by 14.48％,while the dominance of wetland landscapes increased by 31.06％.During the period from 1990 to 2020,the ecological risk in the Sanjiangyuan National Park generally exhibited a significant downward trend with fluctuations,decreasing by 11.28％overall,with 2000 as the turning point.In the past 30 years,the ecological risk level in the Sanjiangyuan National Park has tended to shift from higher levels to lower levels,with a total area of 27 447.19 km2 experiencing a decrease in ecological risk.The spatial differentiation of ecological risks in the Sanjiangyuan National Park was significant,showing a gradient change trend from the center to the periphery.The ecological risk stability area was the main region,followed by the improvement area and the deterioration area.The ecological risk in the Yellow River source park was the most severe.
landscape patternland useecological riskstemporal and spatial characteristicsSanjiangyuan National Park
NETL
NSTL
万方数据
