Abstract:Ecosystem functions could be used to evaluate the environmental quality and provide scientific evidence in decision-making of environment protection and ecosystem construction. Many evaluations on the values of ecosystem functions had been done during the last decades, whereas the researches considering the integrated impacts of spatial, quality and temporal factors on the values of ecosystem functions were rare.
Focusing on these issues, Kangbao County in Hebei Province, which located in the north agro-pastoral ecotone, was selected as the study area, technology of RS and GIS were applied in the study, combined with the theory of ecological value, coefficient of regional difference， coefficient of spatial heterogeneity and coefficient of service-payment were calculated to modify the spatial, quality and temporal factors of the Costanzas‘ method and model of integrated evaluation of ecosystem functions was put forward in the paper. Meantime, the dynamics values of ecosystem functions of Kangbao County were discussed.
The model improved the evaluation methods of ecosystem functions by comprehensive consideration of social, natural and economy influence on the value. Based on the model, the values of ecosystem functions of Kangbao County was evaluated and the results implied that: the unreasonable land use could limit the supplying capacity of ecosystem functions, while the planned ecosystem construction could promote and resume the ecosystem functions. Ecosystem construction mainly including the returning land for farming to forestry (grass) was effective measure to resume ecosystem functions. Model of integrated evaluation of ecosystem functions with comprehensive consideration of spatial, quality and temporal factors could provide timely, exact and helpful information in decision-making of ecosystem conservation and social development, and had practical significance for ecosystem construction and environment protection.