生态系统, 多陆面因子协同作用, 潜热通量, 感热通量, 陆-气耦合

As a hot spot of “land-atmosphere coupling”, the current study focuses on the spatial and temporal distribution of land atmosphere coupling and the influence of hydrothermal conditions in the climate transition regions, but lacks the study on the synergistic effect of multi-factor and the difference in coupling degree among different ecosystems. Based on the station observation data, the paper focused on the coupling relationship between land surface water, thermal and ecological factors and surface fluxes, comparatively analyzed the differences in single-factor and multi-factor synergistic land-atmosphere coupling among different ecosystems, and assessed the contribution of each land surface factor to the coupling degree. The results show that in single-factor coupling, the coupling between latent heat flux and leaf area index is the strongest for sparse vegetation, and the coupling between latent heat flux and soil temperature is the strongest for farmland; the coupling between sensible heat flux and soil temperature is the strongest for grassland, forest and farmland. Multi-factor synergistic coupling is significantly better than that of single factor, and multi-factor synergistic coupling with latent heat flux is significantly enhanced in forest and sparse vegetation, and synergistic coupling with sensible heat flux is obviously enhanced in sparse vegetation. Among the contributions of each factor to the surface fluxes, in grassland system sensible and latent heat fluxes are dominated by thermal and ecological factors, respectively; in sparse vegetation system latent heat flux is codominated by the soil moisture factor and leaf area index, and sensible heat flux is dominated by the thermal factor; and latent heat and sensible heat fluxes are dominated by the thermal factor in farmland and forest system. Under drought conditions, the contributions of soil moisture and ecological factors to latent and sensible heat fluxes increase in most ecosystems.

ecosystem, synergistic effects of multiple land surface factors, latent heat flux, sensible heat flux, land-atmosphere coupling