The Mechanism Preliminary Analysis of Spatiotemporal Evolution Effect of Ecosystem Quality in Wenchuan (Magnitude 8.0) Earthquake Disaster Area, China

Abstract

Abstract To sustain ecosystem development, ecosystem quality reflects the basic capabilities of ecosystems. This study used a three-layer analysis method to explain seismic ecological effects and reveal the evolution mechanism. The results are as follows: (1) The north had better vegetation growth and quality than the south, west, and east based on basic characteristics; In terms of stability characteristics, vegetation growth in the north is better than that in the south, and vegetation quality in the south is better than that in the north; In addition, in terms of restoration degree, both vegetation growth and vegetation quality have been restored. (2) A change in ecosystem pattern is the root cause of ecosystem quality changes. (3) Ecological effect evolution has the following aspects. The spatial and temporal changes of background change: the urban area increased by 0.82%, while the grassland area and farmland area decreased by 0.76% and 0.68%, respectively. The heterogeneity of the background is reflected in the landscape pattern: the completion of forest is reduced, the fragmentation is increased, the actual situation is not improved despite the increase of forest area, and the living space provided for species is reduced. The background evolution is reflected in the correlation: the forest has a strong promoting force to the ecosystem change, while the city restrains the development of the ecosystem. (4) The background evolution is reflected in the coupling relationship: although the coupling relationship has fluctuations, it is in a benign change. Calculation presented in this paper is rational and objective, and it reflects the evolution of ecosystems.