Abstract: Evaluation of farmland shelterbelt ecosystem services is of vital importance due to its practical application in regional economical development and ecological environment protection. In this study, the farmland eco-service function value of Shandong Province in 2001-2005 was evaluated by the methods of market price, opportunity cost, and shadow price. In 2001 and 2005, the total ecological service function value of the farmland ecosystem in the Province was 95.83×10⁸ and 124.97×10⁸ Yuan, respectively, and the ecological service function index value was in the order of soil conservation > crop yield increment > biodiversity protection > CO₂ fixation and O₂ release > air purification. The increment of the total ecological service was 7.29×10⁸ billion per year, among which, the increment value of soil conservation service was the largest (3.23×10⁸ Yuan), followed by that of soil protection (2.19×10⁸ Yuan), crop yield increment (1.25×10⁸ Yuan), biodiversity protection (5.60×10⁷ Yuan), CO₂ fixation and O₂ release (5.00×10⁶ Yuan), and air purification (1.00×10⁶ Yuan). Due to the tremendous ecological service function value of formlanl shelterbelt, the ecological service market compensation mechanism and the perfect ecological service function evaluation method should be established as early as possible, so as to transform farmland from an ecological type into an ecological and economical type.

Key words: soil organic carbon, microbial biomass carbon, water soluble organic carbon, microbial functional diversity, Carya cathayensis.